Iron Based Superconducting Thin Films
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Iron Based Superconducting Thin Films
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Author : Silvia Haindl
language : en
Publisher: Springer Nature
Release Date : 2021-06-27
Iron Based Superconducting Thin Films written by Silvia Haindl and has been published by Springer Nature this book supported file pdf, txt, epub, kindle and other format this book has been release on 2021-06-27 with Technology & Engineering categories.
This book provides a modern introduction to the growth, characterization, and physics of iron-based superconducting thin films. Iron pnictide and iron chalcogenide compounds have become intensively studied key materials in condensed matter physics due to their potential for high temperature superconductivity. With maximum critical temperatures of around 60 K, the new superconductors rank first after the celebrated cuprates, and the latest announcements on ultrathin films promise even more. Thin film synthesis of these superconductors began in 2008 immediately after their discovery, and this growing research area has seen remarkable progress up to the present day, especially with regard to the iron chalcogenides FeSe and FeSe1-xTex, the iron pnictide BaFe2-xCoxAs2 and iron-oxyarsenides. This essential volume provides comprehensive, state-of-the-art coverage of iron-based superconducting thin films in topical chapters with detailed information on thin film synthesis and growth, analytical film characterization, interfaces, and various aspects on physics and materials properties. Current efforts towards technological applications and functional films are outlined and discussed. The development and latest results for monolayer FeSe films are also presented. This book serves as a key reference for students, lecturers, industry engineers, and academic researchers who would like to gain an overview of this complex and growing research area.
Enhanced Superconducting Properties Of Iron Chalcogenide Thin Films
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Author : Li Chen
language : en
Publisher:
Release Date : 2013
Enhanced Superconducting Properties Of Iron Chalcogenide Thin Films written by Li Chen 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.
Among the newly discovered iron-based superconductor, FeSe with the simplest structure and a transition temperature (T_c) around 8 K arouses much research interest. Although its Tc is much lower than that of the cuprates, iron chalcogenide has low anisotropy, slow decrease of the critical current density (J_c) with increasing magnetic field and high upper critical field H_c2 as well as easy composition control, which makes it a promising candidate to substitute NbSn/NbTi for high field applications. Compared with its bulk counterpart, iron-based superconductor thin film has a great potential in developing the ordered quasi-2D structure and is suitable for coating technology which has already been applied in YBa_2Cu_3O_7-x coated conductors. In this thesis, we first optimized pure FeSe thin films by different growth conditions using pulsed laser deposition (PLD) and post-annealing procedures. The microstructure properties of the films including the epitaxial quality, interface structure and secondary phase have been studied and correlated with the superconducting properties. Second, we reported our initial attempt on introducing the flux pinning centers into FeSe_0.5Te_0.5 thin films either under a controlled oxygen atmosphere or with a thin CeO_2 interlayer. The microstructure of the FeSe_0.5Te_0.5 films including the epitaxial quality, the interface structure and the secondary phase have been studied and correlated with the in-field performance of the superconducting thin films to explore the pinning properties of these nanoscale defects. Very recently, ion beam assisted deposition (IBAD) substrates have been used to grow high quality FeSe_0.5Te_0.5 tape with excellent in-field performance. The film on IBAD substrate involves multiple steps of seed layer and buffer layer deposition to establish the epitaxial growth template. Therefore a simplified and cost effective iron-based coated conductor is more desirable. Towards the practical application, we demonstrated the growth of superconducting FeSe_0.5Te_0.5 film on amorphous glass substrates for the first time. The film is highly textured with excellent superconducting properties, e.g., T_c of 10 K and J_c under self-field as high as 1.2 x 10^4 A/cm^2 at 4 K. Further optimization of the film growth with various nanoscale interlayers has been carried out. In addition the Te rich iron chalcogenide thin film with composition close to the composition with antiferromagnetic (AFM) transition has been demonstrated. Compared to the FeSe_0.5Te_0.5 which claimed to be the optimum composition from the literature report, the FeSe_0.1Te_0.9 is even more promising for the high field application with its coexistence of super high upper critical field and high critical current density. The electronic version of this dissertation is accessible from http://hdl.handle.net/1969.1/151063
Atomic Structure Design In Iron Based Superconductors
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Author : Jong-Hoon Kang
language : en
Publisher:
Release Date : 2018
Atomic Structure Design In Iron Based Superconductors written by Jong-Hoon Kang and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018 with categories.
Superconductivity often emerges on the border of a broken-symmetry phase in iron-based high-temperature superconductors. Previous bulk studies have shown that the broken symmetry phase is suppressed by chemical doping or pressure in a parent material and the superconducting transition temperature is highest for regular tetrahedral geometry. However, little is known about how to deliberately maintain a regular tetrahedron through a tetragonal-to-orthorhombic phase transition. I present an epitaxial thin films approach for the atomic structure design of iron-based superconductors to understand the relation between structure and properties, and enhance the superconducting transition temperature (Tc). Epitaxial thin film heterostructures and superlattices lead to the study of interface engineering and strain engineering for manipulating atomic configurations at the interface. Furthermore, the suppression of an orthorhombic phase transition by dimension control is suggested, which enables atomic geometry to a reach regular tetrahedron with two independent structural parameters such as tetragonality and orthorhombicity. Finally, I will describe the influence of atomic geometry on Tc, which potentially reveals an intriguing interplay between magnetism and superconductivity.
Superconductivity
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Author : Paolo Mele
language : en
Publisher: Springer Nature
Release Date : 2019-08-21
Superconductivity written by Paolo Mele and has been published by Springer Nature this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019-08-21 with Technology & Engineering categories.
This book provides readers with a comprehensive overview of the science of superconducting materials. It serves as a fundamental information source on the actual techniques and methodologies involved in superconducting materials growth, characterization and processing. This book includes coverage of several categories of medium and high-temperature superconducting materials: cuprate oxides, borides, and iron-based chalcogenides and pnictides. Provides a single-source reference on superconducting materials growth, characterization and processing; Bridges the gap between materials science and applications of superconductors; Discusses several categories of superconducting materials such as cuprate oxides, borides, and iron-based chalcogenides and pnictides; Covers synthesis, characterization, and processing of superconducting materials, as well as the nanoengineering approach to tailor the properties of the used materials at the nanoscale level.
Iron Based Superconductors
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Author : Nan Lin Wang
language : en
Publisher: CRC Press
Release Date : 2012-11-19
Iron Based Superconductors written by Nan Lin Wang and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-11-19 with Science categories.
From fundamental physics point of view, iron-based superconductors have properties that are more amenable to band structural calculations. This book reviews the progress made in this fascinating field. With contributions from leading experts, the book provides a guide to understanding materials, physical properties, and superconductivity mechanism aspects, and is important for students and beginners to have an overall view of the recent progress in this active field.
Angle Resolved Photoemission Spectroscopy On High Temperature Superconductors
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Author : Junfeng He
language : en
Publisher: Springer
Release Date : 2016-06-21
Angle Resolved Photoemission Spectroscopy On High Temperature Superconductors written by Junfeng He and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016-06-21 with Technology & Engineering categories.
This book mainly focuses on the study of the high-temperature superconductor Bi2Sr2CaCu2O8+δ (Bi2212) and single-layer FeSe film grown on SrTiO3 (STO) substrate by means of angle-resolved photoemission spectroscopy (ARPES). It provides the first electronic evidence for the origin of the anomalous high-temperature superconductivity in single-layer FeSe grown on SrTiO3 substrate. Two coexisted sharp-mode couplings have been identified in superconducting Bi2212. The first ARPES study on single-layer FeSe/STO films has provided key insights into the electronic origin of superconductivity in this system. A phase diagram and electronic indication of high Tc and insulator to superconductor crossover have been established in the single-layer FeSe/STO films. Readers will find essential information on the techniques used and interesting physical phenomena observed by ARPES.
Thin Film Physics And Devices Fundamental Mechanism Materials And Applications For Thin Films
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Author : Jianguo Zhu
language : en
Publisher: World Scientific
Release Date : 2021-06-18
Thin Film Physics And Devices Fundamental Mechanism Materials And Applications For Thin Films written by Jianguo Zhu and has been published by World Scientific this book supported file pdf, txt, epub, kindle and other format this book has been release on 2021-06-18 with Science categories.
Thin films have an extremely broad range of applications from electronics and optics to new materials and devices. Collaborative and multidisciplinary efforts from physicists, materials scientists, engineers and others have established and advanced a field with key pillars constituting (i) the synthesis and processing of thin films, (ii) the understanding of physical properties in relation to the nanometer scale, (iii) the design and fabrication of nano-devices or devices with thin film materials as building blocks, and (iv) the design and construction of novel tools for characterization of thin films.Against the backdrop of the increasingly interdisciplinary field, this book sets off to inform the basics of thin film physics and thin film devices. Readers are systematically introduced to the synthesis, processing and application of thin films; they will also study the formation of thin films, their structure and defects, and their various properties — mechanical, electrical, semiconducting, magnetic, and superconducting. With a primary focus on inorganic thin film materials, the book also ventures on organic materials such as self-assembled monolayers and Langmuir-Blodgett films.This book will be effective as a teaching or reference material in the various disciplines, ranging from Materials Science and Engineering, Electronic Science and Engineering, Electronic Materials and Components, Semiconductor Physics and Devices, to Applied Physics and more. The original Chinese publication has been instrumental in this purpose across many Chinese universities and colleges.
High Tc Superconductor Thin Films
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Author : L. Correra
language : en
Publisher: Elsevier
Release Date : 2012-12-02
High Tc Superconductor Thin Films written by L. Correra and has been published by Elsevier this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-12-02 with Technology & Engineering categories.
Interdisciplinary research on superconducting oxides is the main focus of the contributions in this volume. Several aspects of the thin film field from fundamental properties to applications are examined. Interesting results for the Bi system are also reviewed. The 132 papers, including 8 invited, report mainly on the 1-2-3 system, indicating that the Y-Ba-Cu-O and related compounds are still the most intensively studied materials in this field. The volume attests to the significant progress that has been made in this field, as well as reporting on the challenging problems that still remain to be solved.
Combined Angle Resolved Photoemission And In Situ Transport Studies Of Superconductivity In Fese Srtio 3 Thin Films
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Author : Brendan David Faeth
language : en
Publisher:
Release Date : 2020
Combined Angle Resolved Photoemission And In Situ Transport Studies Of Superconductivity In Fese Srtio 3 Thin Films written by Brendan David Faeth and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2020 with categories.
In bulk form the prototypical iron based superconductor FeSe has a humble \Tc of only 8~K. When grown on the ubiquitous perovskite SrTiO$_3$, however, the interface appears to exhibit an enormous superconducting enhancement of up to $\approx$60~K, in excess of any other known Fe based material in bulk. However, due to the challenges inherent to the study of air-sensitive interfacial superconductors, the nature and origin of this enhancement effect remain mysterious. A complete understanding of the underlying enhancement mechanism in this novel system could open the door to engineering new interfacial superconductors with higher~$T_c$'s. In this dissertation, we use the synergistic combination of molecular beam epitaxy (MBE), angle-resolved photoemission spectroscopy (ARPES), and \insitu resistivity to exhaustively explore the novel superconducting behavior of \FeSeSTO ultra-thin films. In doing so, we reveal an unprecedentedly large pseudogap regime in single unit cell thick (1-UC) \FeSeSTO where the spectroscopic gap persists at elevated temperatures \smash{(\Tgap $\approx$ 70 K)} well above the onset of zero resistance \smash{(\Tzero$\approx$ 30 K)}. Furthermore, by systematically comparing transport behavior across many samples, we observe distinct signatures of two-dimensional (2D) superconducting phase fluctuations, revealing a mixed vortex state hosting incoherent Cooper pairs which ultimately drives the pseudogap observed by ARPES at elevated temperatures. This naturally explains the unconventional gap behavior and reconciles many previously mysterious longstanding discrepancies between transport and spectroscopic behaviors in 1-UC \FeSeSTOns. Building on this result, we exploit the synthesis power of MBE to study how superconductivity at the FeSe/SrTiO$_3$ interface responds to the additional growth of extra layers, using \insitu transport measurements to gain access to the buried interface. In contrast to previous reports, we show that the transport \Tc of the interfacial monolayer is robust and largely unaffected by additional FeSe layers, and that the earlier reported reduction of \Tc in thicker films can be explained by parallel transport channels in the presence of a broad, 2D transition. This places important constraints on the mechanism of the \Tc enhancement. In multi-layer samples, we successfully measure a macroscopic zero resistance state induced via alkali surface-doping, and map out the entire doping-dependent superconducting dome in the absence of interfacial effects. Surprisingly, we find that the onset of zero resistance for optimally surface-doped samples occurs at ($\approx$ 28 K) - nearly identical to the best interfacial films ($\approx$ 30 K). Finally, we performed comprehensive photon energy dependent measurements of the enigmatic 1-UC \FeSeSTO replica band features using synchrotron ARPES. Studying the evolution of the replica band at $M$ with increasing photon energy, we find conclusive evidence that the interfacial replica band in \FeSeSTO originates from an intrinsic electron-phonon coupling effect. This confirms that interfacial phonon coupling at atomic interfaces can produce nontrivial modifications to the underlying bandstructure, a finding with widespread implications. Taken together, our results demonstrate the critical role that limited dimensionality plays in the emergence of superconductivity in FeSe/SrTiO$_3$, and in interfacial high-$T_c$ systems more generally. Based on this understanding, we suggest several promising pathways forward for further research exploiting interfacial enhancement mechanisms of superconductivity.
Elastic And Inelastic Scanning Tunneling Spectroscopy On Iron Based Superconductors
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Author : Jandke, Jasmin Maria
language : en
Publisher: KIT Scientific Publishing
Release Date : 2019-05-02
Elastic And Inelastic Scanning Tunneling Spectroscopy On Iron Based Superconductors written by Jandke, Jasmin Maria and has been published by KIT Scientific Publishing this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019-05-02 with categories.
