Reconstructions At The Interface In Complex Oxide Heterostructures With Strongly Correlated Electrons
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Reconstructions At The Interface In Complex Oxide Heterostructures With Strongly Correlated Electrons
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Author : Benjamin Adam Gray
language : en
Publisher:
Release Date : 2013
Reconstructions At The Interface In Complex Oxide Heterostructures With Strongly Correlated Electrons written by Benjamin Adam Gray and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013 with Heterostructures categories.
Strongly correlated oxides exhibit a rich spectrum of closely competing orders near the localized-itinerant Mott insulator transition leaving their ground states ripe with instabilities susceptible to small perturbations such as lattice distortions, variation in stoichiometry, magnetic and electric fields, etc. As the field of interfacial engineering has matured, these underlying instabilities in the electronic structure of correlated oxides continue to be leveraged to manipulate existing phases or search for emergent ones. The central theme is matching materials across the interface with disparate physical, chemical, electronic, or magnetic structure to harness interfacial reconstructions in the strongly coupled charge, spin, orbital, and lattice degrees of freedom. In this dissertation, we apply the above paradigm to cuprate-manganite and cuprate-titanate interfaces. We examine ultrathin YBa2Cu3O7/La2/3Ca1/3MnO3 multilayers, where interfacial charge reconstruction modulates the distribution of charge carriers within the superconducting planes and thereby act as dials to tune through the cuprate doping phase diagram. The ultrathin nature of the cuprate layers allows the reconstructed states to be resolved free of a bulk admixture. The depleted carriers are observed to directly enter the CuO2 planes. With increasing LCMO thickness, magnetic correlations are introduced, and coupling between interfacial Cu and Mn develops. The reconstructions in spin and electronic degrees of freedom found in cuprate-manganite heterostructures are expected to completely mask all other competing interactions. To this end, SrTiO3 is incorporated as a spacer material in cuprate-titanate multilayers to reveal the role of dimensionality, interlayer coupling, and broken translational symmetry. At the unit cell limit, a decrease in carrier concentration is found that directly correlates with underdoping from lost charge reservoir layers at the interface, while increased STO layer thickness is found to augment the carrier concentration with the charge reservoir layers but has no effect on the doping within the superconducting planes. Also spectroscopic evidence for charge transfer across the interface between Cu and Ti is shown to support a recent theoretical prediction of pre-doping at the cuprate-titanate interface in response to a polar discontinuity at the interface.
Spectroscopy Of Complex Oxide Interfaces
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Author : Claudia Cancellieri
language : en
Publisher: Springer
Release Date : 2018-04-09
Spectroscopy Of Complex Oxide Interfaces written by Claudia Cancellieri and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018-04-09 with Technology & Engineering categories.
This book summarizes the most recent and compelling experimental results for complex oxide interfaces. The results of this book were obtained with the cutting-edge photoemission technique at highest energy resolution. Due to their fascinating properties for new-generation electronic devices and the challenge of investigating buried regions, the book chiefly focuses on complex oxide interfaces. The crucial feature of exploring buried interfaces is the use of soft X-ray angle-resolved photoemission spectroscopy (ARPES) operating on the energy range of a few hundred eV to increase the photoelectron mean free path, enabling the photons to penetrate through the top layers – in contrast to conventional ultraviolet (UV)-ARPES techniques. The results presented here, achieved by different research groups around the world, are summarized in a clearly structured way and discussed in comparison with other photoemission spectroscopy techniques and other oxide materials. They are complemented and supported by the most recent theoretical calculations as well as results of complementary experimental techniques including electron transport and inelastic resonant X-ray scattering.
Emergent Phenomena At Complex Oxide Interfaces
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Author : Pu Yu
language : en
Publisher:
Release Date : 2011
Emergent Phenomena At Complex Oxide Interfaces written by Pu Yu and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011 with categories.
Novel phenomena and functionalities at epitaxial complex oxide heterostructures have been attracting huge scientific attention because of the intriguing fundamental physics as well as potential for technological applications that they embody. Essentially, charge and spin reconstruction at the interface can lead to exotic properties, which are completely different from those inherent to the individual materials, for example, a conductive interface between two insulating materials and interface ferromagnetism in the proximity of an antiferromagnet. The interplay between charge and spin degrees of freedom can be particularly intriguing, leading to a fascinating realm, called multiferroic. In this dissertation, a systematic study is performed on the electronic (charge) and magnetic (spin) interaction/reconstruction across the interface of an all-oxide model heterostructure system consisting of the ferromagnet (FM) La$_{0.7}$Sr$_{0.3}$MnO$_3$ (LSMO) and the multiferroic (ferroelectric and antiferromagnetic) BiFeO$_3$ (BFO). The study demonstrates two pathways of using these exotic interfacial properties to control bulk properties, both the ferroelectricity in BFO and ferromagnetism in LSMO. The journey starts with the growth of high-quality BFO/LSMO heterostructures with unit-cell precision control using reflection high-energy electron diffraction combined with pulsed-laser deposition, providing an important platform for the investigation of electronic and magnetic coupling phenomena across the interface. First, we have observed a novel consequence of the interface electronic interaction due to the so-called ``polar discontinuity'', namely, a built-in electrostatic potential accumulates across the heterointerface, and provides deterministic control of ferroelectric polarization states in thin films. This observation suggests a strong, delocalized effect with important implications for future electronics based on such materials. Secondly, we have revealed a strong magnetic coupling at this interface, manifested in the form of an enhanced coercive field as well as a significant exchange-bias coupling. Based on our x-ray magnetic circular dichroism studies, the origin of the exchange-bias coupling is attributed to a novel ferromagnetic state formed in the antiferromagnetic BFO sublattice at the interface with LSMO. Thirdly, using a field effect geometry, we have proposed a pathway to use an electric field to control the magnetism in LSMO in which the ground state of the interfacial ferromagnetic state is strongly correlated with the ferroelectric polarization. Magnetotransport measurements clearly demonstrate a reversible switch/control between two distinct exchange-bias states by isothermally switching the ferroelectric polarization of BFO. This is an important step towards controlling magnetization with the electric field, which may enable a new class of electrically controllable spintronic devices and provide a new basis for producing electrically controllable spin-polarized currents. Finally, combining experimental results with first-principle and phenomenological model calculations, a microscopic model has been proposed to understand the underlying physics of the magnetoelectric coupling, providing further insights on achieving the electric-field control of magnetism. In summary, our studies on the interfacial electronic and magnetic properties at BFO/LSMO heterointerfaces have revealed a strong interplay between the charge, spin, orbital and lattice degrees of freedom at the interface, which will have important implications for a new pathway to use the interface properties to control bulk functionalities (ferroelectric polarization and ferromagnetic magnetization in this study). Such couplings at the interface may be extended to other oxides and will bring into play remarkable physical concepts to this developing field of complex oxide heterointerfaces.
Mott Transition And Electronic Structure In Complex Oxide Heterostructures
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Author : Jian Liu
language : en
Publisher:
Release Date : 2012
Mott Transition And Electronic Structure In Complex Oxide Heterostructures written by Jian Liu and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012 with Electronic structure categories.
Strongly correlated electron systems, particularly transition metal oxides, have been a focus of condensed matter physics for more than two decades since the discovery of high-temperature superconducting cuprates. Diverse competing phases emerge, spanning from exotic magnetism to unconventional superconductivity, in proximity to the localized-itinerant transition of Mott insulators. While studies were concentrated on bulk crystals, the recent rapid advance in synthesis has enabled fabrication of high-quality oxide heterostructures, offering a new route to create novel artificial quantum materials. This dissertation details the investigation on ultrathin films and heterostructures of 3d7(t2g6eg1 ) systems with spin (S=1/2) and orbital degeneracies. Perovskite RNiO 3 (R = rare earth) was chosen as a representative model, since its Ni 3+ valence corresponds to the low-spin 3d7 configuration. The heteroepitaxial growth of RNiO3 ultrathin films and heterostructures was studied by laser molecular beam epitaxy. To achieve a layer-by-layer growth mode crucial for stabilizing the proper stoichiometry and creating sharp interfaces, a fast pumping plus interruption growth method was developed. In addition to conventional transport measurement, resonant x-ray absorption spectroscopy was used to characterize the resulting electronic structures. The results demonstrate that the effect of polarity mismatch on the initial growth may lead to a chemical pathway for compensating the dipolar field. By utilizing the x-ray linear dichroic effect, an asymmetric heteroepitaxial strain-induced d orbital response in LaNiO3 was revealed. Moreover, the interfacial lattice constraint was found to modulate the Ni-O covalency in RNiO3 by simultaneously tuning the Madelung energy and the p--d hybridization, leading to a self-doped mechanism that controls the collective phase behavior in NdNiO3. The electronic reconstructions in correlated quantum wells were also investigated in superlattices of LaNiO3/LaAlO3. In proximity to the confinement limit, a Mott-type metal-insulator transition was observed with tendency towards charge ordering as a competing ground state. The interfacial Ni-O-Al bond was found to highly suppress the apical ligand hole density and result in confinement-induced orbital polarization. The key role of the interfacial boundary in selecting the many-body electronic ground state was directly demonstrated in quantum wells of NdNiO3.
Multifunctional Oxide Heterostructures
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Author : Evgeny Y. Tsymbal
language : en
Publisher: Oxford University Press
Release Date : 2012-08-30
Multifunctional Oxide Heterostructures written by Evgeny Y. Tsymbal and has been published by Oxford University Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-08-30 with Science categories.
This volume explores the rapidly developing field of oxide thin-films and heterostructures, which exhibit unusual physical properties interesting from the fundamental point of view and for device application. The chapters discuss topics that represent some of the key innovations in the field over recent years.
Oxide Interfaces
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Author :
language : en
Publisher:
Release Date : 2016
Oxide Interfaces written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016 with categories.
This Final Report describes the scientific accomplishments that have been achieved with support from grant DE-FG02-06ER46273 during the period 6/1/2012- 5/31/2016. The overall goals of this program were focused on the behavior of epitaxial oxide heterostructures at atomic length scales (Ångstroms), and correspondingly short time-scales (fs -ns). The results contributed fundamentally to one of the currently most active frontiers in condensed matter physics research, namely to better understand the intricate relationship between charge, lattice, orbital and spin degrees of freedom that are exhibited by complex oxide heterostructures. The findings also contributed towards an important technological goal which was to achieve a better basic understanding of structural and electronic correlations so that the unusual properties of complex oxides can be exploited for energy-critical applications. Specific research directions included: probing the microscopic behavior of epitaxial interfaces and buried layers; novel materials structures that emerge from ionic and electronic reconfiguration at epitaxial interfaces; ultrahigh-resolution mapping of the atomic structure of heterointerfaces using synchrotron-based x-ray surface scattering, including direct methods of phase retrieval; using ultrafast lasers to study the effects of transient strain on coherent manipulation of multi-ferroic order parameters; and investigating structural ordering and relaxation processes in real-time.
Epitaxial Growth Of Complex Metal Oxides
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Author : Gertjan Koster
language : en
Publisher: Woodhead Publishing
Release Date : 2022-04-22
Epitaxial Growth Of Complex Metal Oxides written by Gertjan Koster and has been published by Woodhead Publishing this book supported file pdf, txt, epub, kindle and other format this book has been release on 2022-04-22 with Science categories.
Epitaxial Growth of Complex Metal Oxides, Second Edition reviews techniques and recent developments in the fabrication quality of complex metal oxides, which are facilitating advances in electronic, magnetic and optical applications. Sections review the key techniques involved in the epitaxial growth of complex metal oxides and explore the effects of strain and stoichiometry on crystal structure and related properties in thin film oxides. Finally, the book concludes by discussing selected examples of important applications of complex metal oxide thin films, including optoelectronics, batteries, spintronics and neuromorphic applications. This new edition has been fully updated, with brand new chapters on topics such as atomic layer deposition, interfaces, STEM-EELs, and the epitaxial growth of multiferroics, ferroelectrics and nanocomposites. Examines the techniques used in epitaxial thin film growth for complex oxides, including atomic layer deposition, sputtering techniques, molecular beam epitaxy, and chemical solution deposition techniques Reviews materials design strategies and materials property analysis methods, including the impacts of defects, strain, interfaces and stoichiometry Describes key applications of epitaxially grown metal oxides, including optoelectronics, batteries, spintronics and neuromorphic applications
Electronic And Spin Reconstruction At Complex Oxide Interfaces
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Author :
language : en
Publisher:
Release Date : 2011
Electronic And Spin Reconstruction At Complex Oxide Interfaces written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011 with categories.
Functional Oxide Heterostructures On Semiconductors
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Author : Hosung Seo
language : en
Publisher:
Release Date : 2013
Functional Oxide Heterostructures On Semiconductors written by Hosung Seo and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013 with categories.
Complex oxides exhibiting a wide variety of novel functional properties such as ferromagnetism and ferroelectricity have been extensively studied during the past decades. Recent advances in the field of oxide heteroepitaxy have made it possible to create and control hybrid oxide heterostructures with abrupt epitaxial interfaces. The oxide heteroepitaxy with the capability of controlling interface composition, strain, length scales, etc. has opened the totally new and exciting scientific avenue and has offered potential device applications to be explored. Epitaxial integration of functional oxides on semiconductor such as Si (001) and Ge(001) is of great interest, as it potentially leads to further technological development of these interesting oxide systems. In this dissertation, using density functional theory we explore physics and chemistry of novel oxide heterostructures and issues related to the integration of functional oxides on semiconductors. Oxide materials that are studied in this dissertation include polar LaAlO3, high-k dielectric SrTiO3, photocatalytic anatase TiO2 and CoO, and strongly correlated magnetic oxide LaCoO3.
Metal Oxide Based Thin Film Structures
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Author : Nini Pryds
language : en
Publisher: Elsevier
Release Date : 2017-09-07
Metal Oxide Based Thin Film Structures written by Nini Pryds and has been published by Elsevier this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017-09-07 with Technology & Engineering categories.
Metal Oxide-Based Thin Film Structures: Formation, Characterization and Application of Interface-Based Phenomena bridges the gap between thin film deposition and device development by exploring the synthesis, properties and applications of thin film interfaces. Part I deals with theoretical and experimental aspects of epitaxial growth, the structure and morphology of oxide-metal interfaces deposited with different deposition techniques and new developments in growth methods. Part II concerns analysis techniques for the electrical, optical, magnetic and structural properties of thin film interfaces. In Part III, the emphasis is on ionic and electronic transport at the interfaces of Metal-oxide thin films. Part IV discusses methods for tailoring metal oxide thin film interfaces for specific applications, including microelectronics, communication, optical electronics, catalysis, and energy generation and conservation. This book is an essential resource for anyone seeking to further their knowledge of metal oxide thin films and interfaces, including scientists and engineers working on electronic devices and energy systems and those engaged in research into electronic materials. Introduces the theoretical and experimental aspects of epitaxial growth for the benefit of readers new to the field Explores state-of-the-art analysis techniques and their application to interface properties in order to give a fuller understanding of the relationship between macroscopic properties and atomic-scale manipulation Discusses techniques for tailoring thin film interfaces for specific applications, including information, electronics and energy technologies, making this book essential reading for materials scientists and engineers alike