Antiferromagnetism And Superconductivity In Ce Based Heavy Fermion Systems
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Antiferromagnetism And Superconductivity In Ce Based Heavy Fermion Systems
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Author : Edit Lengyel
language : en
Publisher: Cuvillier Verlag
Release Date : 2008
Antiferromagnetism And Superconductivity In Ce Based Heavy Fermion Systems written by Edit Lengyel and has been published by Cuvillier Verlag this book supported file pdf, txt, epub, kindle and other format this book has been release on 2008 with categories.
Magnetism In Heavy Fermion Systems
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Author : Harry Brian Radousky
language : en
Publisher: World Scientific
Release Date : 2000
Magnetism In Heavy Fermion Systems written by Harry Brian Radousky and has been published by World Scientific this book supported file pdf, txt, epub, kindle and other format this book has been release on 2000 with Science categories.
Magnetism in Heavy Fermion Systems is a review volume which covers an important subset of topics in the field of heavy fermion and non-Fermi liquid physics. It summarizes much of the experimental information in these areas, and includes an article which discusses theoretical interpretations of the complex magnetic behavior of heavy fermion systems. The topics covered include heavy fermion superconductivity, muon spin relaxation in small-moment heavy fermions, neutron scattering from heavy fermions, random localized magnetism in heavy fermions, and magnetism in Pr-containing cuprates. One feature of the book which should be helpful to graduate students and new workers in the field is the extensive references and a separate list of review articles.
Superconductivity Magnetism Quantum Criticality And Hidden Order In Quantum Materials
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Author : Dom Lal Kunwar
language : en
Publisher:
Release Date : 2022
Superconductivity Magnetism Quantum Criticality And Hidden Order In Quantum Materials written by Dom Lal Kunwar and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2022 with categories.
The heavy fermions (HF) are strongly correlated electron systems consisting of intermetallic compounds of lanthanides and actinides ions with f -electrons unfilled shells. These systems are very rich in physics and the interplay between competing interactions results in various interesting physical phenomena such as heavy fermion behavior, unconventional superconductivity, non-Fermi-liquid behavior, coexistence of superconductivity and magnetism, and quantum criticality. The origin of such phenomena comes from the interaction of itinerant conduction states with the partially filled 4f - or 5f -electron states of rare earth elements. The study of such important physical phenomena can be possible by tuning the system using nonthermal control parameters, such as chemical composition, magnetic field, and applied pressure. So, studying the chemical pressure effect on heavy fermion systems with or without magnetic field is an intriguing idea to construct various phase diagrams and study their phase transitions. We performed heat capacity (HC), magnetoresistance (MR), and resistivity measurements on the Ce-based 115 and U-based 122 heavy fermion materials at low temperatures. We studied the nature of the quantum critical point, second-order phase transition, and the possible interplay between superconductivity and magnetism. First, we were motivated by the possibility of observing the coexistence of magnetism and unconventional superconductivity in the heavy fermion Ce1-xSmxCoIn5 alloys. We performed specific heat, MR, and resistivity measurements in different magnetic fields. We investigated how the samarium substitution on the cerium site affects the magnetic-field-tuned quantum criticality of stoichiometric CeCoIn5. We have observed Fermi-liquid to non-Fermi-liquid crossovers in the temperature dependence of the electronic specific heat and resistivity at higher external magnetic fields. We obtained the magnetic-field-induced quantum critical point (HQCP) by extrapolating the crossover temperature to zero temperature. Furthermore, we performed a scaling analysis of the electronic specific heat and confirmed the existence of the QCP. According to our findings, the magnitude of (HQCP) decreases as the samarium content rises and ultimately becomes zero. The electronic specific heat and resistivity data reveal a zero-field QCP for xcr = 0.15, which falls inside the antiferromagnetic and superconducting coexistence region. Next, we performed measurements of the heat capacity as a function of temperature in a single crystals URu2-xOsxSi2. Our experimental results show that the critical temperature of the second-order phase transition increases while the value of the Sommerfeld coefficient in the ordered state decreases with an increase in osmium concentration. We also observed the increase in the magnitude of the heat capacity at the critical temperature and a broadening of the critical fluctuations region with an increase in Os concentration. We analyze the experimental data using the Haule- Kotliar model, which identifies the 'hidden order' transition in the parent material URu2Si2 as a transition to a state with nonzero hexadecapolar moment. We showed that our experimental results are consistent with this model. In conclusion, we studied the interplay between superconductivity and magnetism in Ce based 115 and U based 122 single crystal alloys using heat capacity, magnetoresistivity, and resistivity measurements in both cryogenic systems including He-4 and He-3. The understating of various phenomena in these heavy fermions could be helpful in developing higher transition temperature superconductors, energy storage devices, quantum computers, and memory devices in the future.
Physics Of Heavy Fermions Heavy Fermions And Strongly Correlated Electrons Systems
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Author : Onuki Yoshichika
language : en
Publisher: World Scientific
Release Date : 2018-04-20
Physics Of Heavy Fermions Heavy Fermions And Strongly Correlated Electrons Systems written by Onuki Yoshichika and has been published by World Scientific this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018-04-20 with Science categories.
A large variety of materials prove to be fascinating in solid state and condensed matter physics. New materials create new physics, which is spearheaded by the international experimental expert, Prof Yoshichika Onuki. Among them, the f electrons of rare earth and actinide compounds typically exhibit a variety of characteristic properties, including spin and charge orderings, spin and valence fluctuations, heavy fermions, and anisotropic superconductivity. These are mainly manifestations of better competitive phenomena between the RKKY interaction and the Kondo effect. The present text is written so as to understand these phenomena and the research they prompt. For example, superconductivity was once regarded as one of the more well-understood many-body problems. However, it is, in fact, still an exciting phenomenon in new materials. Additionally, magnetism and superconductivity interplay strongly in heavy fermion superconductors. The understanding of anisotropic superconductivity and magnetism is a challenging problem in solid state and condensed matter physics. This book will tackle all these topics and more. Contents: Conduction Electrons and Fermi Surfaces Local Magnetic Moment Single Crystal Growth and Measuring Methods Itinerant 3d-electrons Heavy Fermions Superconductivity Readership: Graduate students and researchers interested and/or involved in single crystal growth, heavy fermions, superconductivity and related experimental methods. Keywords: Heavy Fermions;Strongly Correlated Electrons Systems;Magnetism;SuperconductivityReview: Key Features: Readers can understand the present frontiers of solid state and condensed matter physics, on the basis of fundamental ideas and formulae described in various related methods of measurement This paves the way for readers to participate in research concerning single crystal growth and characteristic properties in rare earth and actinide compounds
Proceedings Of The Yamada Conference Xviii On Superconductivity In Highly Correlated Fermion Systems
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Author : M. Tachiki
language : en
Publisher: Elsevier
Release Date : 2013-09-24
Proceedings Of The Yamada Conference Xviii On Superconductivity In Highly Correlated Fermion Systems written by M. Tachiki and has been published by Elsevier this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013-09-24 with Science categories.
Superconductivity in Highly Correlated Fermion Systems documents the proceedings of the Yamada Conference XVIII on Superconductivity in Highly Correlated Fermion Systems held in Sendai, Japan, from August 31 to September 3, 1987. This book compiles selected papers on the experimental and theoretical advances in the study of superconductivity. The topics include the superconductivity and magnetism in heavy-electron materials, magneto-resistance of heavy-fermion compounds, and magnetic fluctuations and order in exotic superconductors. The fabrication and properties of thin superconducting oxide films, bipolaron models of superconductors, superconducting properties of superlattices, and flux quantization on quasi-crystalline networks are also covered. This publication is recommended for physicists and students researching on the superconductivity in highly correlated fermion systems.
Theoretical And Experimental Aspects Of Valence Fluctuations And Heavy Fermions
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Author : L.C. Gupta
language : en
Publisher: Springer Science & Business Media
Release Date : 2012-12-06
Theoretical And Experimental Aspects Of Valence Fluctuations And Heavy Fermions written by L.C. Gupta and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-12-06 with Science categories.
During the Koln meeting (August 28-31, 1984), Irdia was chosen as the venue for the next International Conference on Valence Fluctuations. lhis was in recognition ard appreciation of the work done, both experimental ard theoretical, by the Irdian scientists in this area during the last decade. We decided to hold this Conference in the month of January, 1987 at Bangalore. lhe subject of Valence Fluctuations has kept itself alive ard active as it has provided many shocks ard suprises particularly among the Ce- ard U-based intermetallies. lhe richness of many interesting physical phenomena occurring in mixed valent materials, the flexibility of modifying their physical properties (by alloying, for example) ard the possibility of synthesizing a wide variety of new such materials seem to be the key factors in this regard. Barely six months before this Conference, an International Conference on Anomalous Rare Earths and Actinides (ICAREA) had been held at Grenoble (July, 1986) which also focussed on mixed valence ard heavy fermion phenomena. In spite of this, the response to this' Conference was very enthusiastic and encouraging. Many interesting ard important results were presented at this Conference which have been included in this volume.
Investigating Strong Correlated Electron Behavior In Heavy Fermion Cesium Platinum Indium And Afm Insulator Lanthanum Nickel Oxide
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Author : Nicholas R. ApRoberts-Warren
language : en
Publisher:
Release Date : 2013
Investigating Strong Correlated Electron Behavior In Heavy Fermion Cesium Platinum Indium And Afm Insulator Lanthanum Nickel Oxide written by Nicholas R. ApRoberts-Warren 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.
The field of strongly correlated electron research is a vibrant and expanding one, with a rich variety of unusual electronic and magnetic behavior. In this thesis we examine two such materials: the heavy fermion superconductor CePt2In7 and anti-ferromagnetic insulator La4Ni3O8. Several years ago, the tetragonal CeMIn5 (M = Co, Rh, Ir) class of heavy fermion systems was discovered, which has revealed a wealth of information concerning the detailed interplay between antiferromagnetism and superconductivity. The basic structural elements of these materials are Ce-In planes, which give rise to a two-dimensional character to the electronic behavior. CePt2In7 is the another member of this heavy fermion class with a very large crystal anisotropy. Our nuclear magnetic resonance (NMR) measurements, which focused on the 115In nucleus, reveal that this system is antiferromagnetic below T[N] = 5.2 K, with staggered antiferromagnetic ordering in-plane, and collinear antiferromagnetic correlations between adjacent planes. We also report measurements of the spin-lattice relaxation rate (T1) both at ambient and under isotropic pressure. We additionally examined the 195Pt signal and used its Knight Shift to extract the Kondo liquid and local moment components of the magnetic susceptbility. These components are then analyzed within the context of the ``two-fluid" model of mixed Kondo/local moment systems. Though there are metal-oxide superconductors utilizing many different transition elements, there have been no nickel-oxide superconductors as of yet. The desire to investigate this paucity of superconductivity leads us to La4Ni3O8, which has many structural and electronic similarities to the high-T[c] cuprates. This compound, produced via oxygen-depletion from a parent compound, contains two-dimensional layers of NiO2 with unusual Ni valences. We report 139La NMR data in La4Ni3O8 that confirm previously reported antiferromagnetic order below T[N] ~ 105 K. Our data reveal dramatic changes in resonance lineshapes, and T1 measurements evidence of low-temperature antiferromagnetic fluctuations associated with the onset of long-range order below T[N], even though there is evidence of a Fermi surface below T[N].
Investigation Of Superconducting Order Parameters In Heavy Fermion And Low Dimensional Metallic Systems Under Pressure
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Author : Corneliu Florin Miclea
language : en
Publisher: Cuvillier Verlag
Release Date : 2008
Investigation Of Superconducting Order Parameters In Heavy Fermion And Low Dimensional Metallic Systems Under Pressure written by Corneliu Florin Miclea and has been published by Cuvillier Verlag this book supported file pdf, txt, epub, kindle and other format this book has been release on 2008 with categories.
Quantum Critical Phenomena Of Valence Transition
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Author : Shinji Watanabe
language : en
Publisher: Springer Nature
Release Date : 2024-01-27
Quantum Critical Phenomena Of Valence Transition written by Shinji Watanabe and has been published by Springer Nature this book supported file pdf, txt, epub, kindle and other format this book has been release on 2024-01-27 with Science categories.
This book comprehensively presents an unconventional quantum criticality caused by valence fluctuations, which offers theoretical understanding of unconventional Fermi-liquid properties in cerium- and ytterbium-based heavy fermion metals including CeCu2(Si,Ge)2 and CeRhIn5 under pressure, and quasicrystal β-YbAlB4 and Yb15Al34Au51. The book begins with an introduction to fundamental concepts for heavy fermion systems, valence fluctuation, and quantum phase transition, including self-consistent renormalization group theory. A subsequent chapter is devoted to a comprehensive description of the theory of the unconventional quantum criticality based on a valence transition, featuring explicit temperature dependence of various physical quantities, which allows for comparisons to relevant experiments. Lastly, it discusses how ubiquitous the valence fluctuation is, presenting candidate materials not only in heavy fermions, but also in strongly correlated electrons represented by high-Tc superconductor cuprates. Introductory chapters provide useful materials for learning fundamentals of heavy fermion systems and their theory. Further, experimental topics relevant to valence fluctuations are valuable resources for those who are new to the field to easily catch up with experimental background and facts.
Theory Of Heavy Fermions And Valence Fluctuations
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Author : Tadao Kasuya
language : en
Publisher: Springer Science & Business Media
Release Date : 2012-12-06
Theory Of Heavy Fermions And Valence Fluctuations written by Tadao Kasuya and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-12-06 with Science categories.
This volume contains the proceedings of the Eighth Taniguchi Interna tional Symposium on the Theory of Condensed Matter, which was held at Shima Kanko Hotel in Shima, Japan, 10-13 April 1985. The topic of the Symposium was Valence Fluctuation and Heavy Fermion Systems, one of the most fundamental problems in present-day condensed matter physics. The dilute Kondo problem, which is one of the most typical and unique many-body problems in condensed matter physics, developed recently into the dense Kondo and the coherent Kondo lattice problems in the 4f elec tron systems. It is accepted now that a large degeneracy in f-electron systems makes this latter situation possible by enhancing the single-site Kondo state relative to the inter-site magnetic interactions. Now, anoma lous behavior in f-electron systems show rich variety and are called valence fluctuation phenomena as a whole. They have, however, a common fea ture. In the lowest temperature region, they show either heavy Fermion like character or a narrow gap formation at the Fermi energy. Discovery of superconductivity in the heavy Fermion systems is attracting more in terest. Anyway, the valence fluctuating states are thought to be of fun damental importance to bridge the gap between the localized magnetic states and the delocalized nownagnetic states.
