Superconductivity Magnetism Quantum Criticality And Hidden Order In Quantum Materials
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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.
Utilization Of Renormalized Mean Field Theory Upon Novel Quantum Materials
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Author : Wei-Lin Tu
language : en
Publisher: Springer
Release Date : 2019-05-08
Utilization Of Renormalized Mean Field Theory Upon Novel Quantum Materials written by Wei-Lin Tu and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019-05-08 with Technology & Engineering categories.
This book offers a new approach to the long-standing problem of high-Tc copper-oxide superconductors. It has been demonstrated that starting from a strongly correlated Hamiltonian, even within the mean-field regime, the “competing orders” revealed by experiments can be achieved using numerical calculations. In the introduction, readers will find a brief review of the high-Tc problem and the unique challenges it poses, as well as a comparatively simple numerical approach, the renormalized mean-field theory (RMFT), which provides rich results detailed in the following chapters. With an additional phase picked up by the original Hamiltonian, some behaviors of interactive fermions under an external magnetic field, which have since been experimentally observed using cold atom techniques, are also highlighted.
Quantum Criticality In Condensed Matter Phenomena Materials And Ideas In Theory And Experiment 50th Karpacz Winter School Of Theoretical Physics
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Author : Janusz Jedrzejewski
language : en
Publisher: World Scientific
Release Date : 2015-07-23
Quantum Criticality In Condensed Matter Phenomena Materials And Ideas In Theory And Experiment 50th Karpacz Winter School Of Theoretical Physics written by Janusz Jedrzejewski and has been published by World Scientific this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015-07-23 with Science categories.
This volume comprises 8 articles written by lecturers of 50th Karpacz Winter School of Theoretical Physics and their collaborators. The contributing lecturers are outstanding researchers, and experts in various fields of physics, in particular in condensed matter, quantum phase transitions and quantum critical phenomena. The articles reflect the contents of the lectures given for school participants and cover various aspects of quantum phase transitions and quantum critical phenomena, from experimental to mathematical ones. For those wishing to get acquainted with the subject, extensive lists of references are provided in the articles.
Superconductivity And Competing Orders At Magnetic Quantum Critical Points
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Author : Matthias Einenkel
language : en
Publisher:
Release Date : 2015
Superconductivity And Competing Orders At Magnetic Quantum Critical Points written by Matthias Einenkel and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015 with categories.
Superconductivity Revisited
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Author : Ralph Dougherty
language : en
Publisher: CRC Press
Release Date : 2012-11-26
Superconductivity Revisited written by Ralph Dougherty and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-11-26 with Science categories.
While the macroscopic phenomenon of superconductivity is well known and in practical use worldwide, the current theoretical paradigm for superconductivity suffers from a number of limitations. For example, there is no currently accepted theoretical explanation for the pattern of superconductor critical temperatures in the periodic table. Historical developments in condensed matter were strongly focused on the similarities of all metals and the electron gas model, with little attention paid to their real differences. Accessible by a wide audience, Superconductivity Revisited explores the work of those who investigated the differences, and laid the foundation for all current and future work. Topics Include Pattern of Elemental Superconductors in the Periodic Table High-Temperature Superconductors Electron Spin in Superconductors Heat Capacity and Magnetic Susceptibility in Superconductors Quantum Foundations of Molecular Electricity and Magnetism Metals and Insulators Electron Transport in Metals Magnetoresistance Quantum Hall Effect Type I and Type II Superconductivity Superconductivity Revisited starts from the foundations and shows that the current theory of the subject cannot explain the pattern of superconductors in the periodic table, as the theory depends on a theory of resistivity not congruent with the Sommerfeld equation. Partial wave scattering is introduced as a route to deal with these issues. The book develops a theory of superconductivity that includes the periodic table. The new, coherent, understandable theory of superconductivity is directly based on thermodynamics, scattering theory, and molecular quantum mechanics.
Non Universal Superconducting Gap Structure In Iron Pnictides Revealed By Magnetic Penetration Depth Measurements
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Author : Kenichiro Hashimoto
language : en
Publisher: Springer
Release Date : 2013-02-16
Non Universal Superconducting Gap Structure In Iron Pnictides Revealed By Magnetic Penetration Depth Measurements written by Kenichiro Hashimoto and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013-02-16 with Technology & Engineering categories.
In this book the author presents two important findings revealed by high-precision magnetic penetration depth measurements in iron-based superconductors which exhibit high-transition temperature superconductivity up to 55 K: one is the fact that the superconducting gap structure in iron-based superconductors depends on a detailed electronic structure of individual materials, and the other is the first strong evidence for the presence of a quantum critical point (QCP) beneath the superconducting dome of iron-based superconductors. The magnetic penetration depth is a powerful probe to elucidate the superconducting gap structure which is intimately related to the pairing mechanism of superconductivity. The author discusses the possible gap structure of individual iron-based superconductors by comparing the gap structure obtained from the penetration depth measurements with theoretical predictions, indicating that the non-universal superconducting gap structure in iron-pnictides can be interpreted in the framework of A1g symmetry. This result imposes a strong constraint on the pairing mechanism of iron-based superconductors. The author also shows clear evidence for the quantum criticality inside the superconducting dome from the absolute zero-temperature penetration depth measurements as a function of chemical composition. A sharp peak of the penetration depth at a certain composition demonstrates pronounced quantum fluctuations associated with the QCP, which separates two distinct superconducting phases. This gives the first convincing signature of a second-order quantum phase transition deep inside the superconducting dome, which may address a key question on the general phase diagram of unconventional superconductivity in the vicinity of a QCP.
Superconductivity
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Author : Eugene A Andryushin
language : en
Publisher: World Scientific Publishing Company
Release Date : 1994-08-10
Superconductivity written by Eugene A Andryushin and has been published by World Scientific Publishing Company this book supported file pdf, txt, epub, kindle and other format this book has been release on 1994-08-10 with categories.
What is superconductivity? How was it discovered? What are the properties of superconductors, how are they applied now, and how are they likely to become widely used in the near future? These are just some of the questions which this book by two leading authorities in the field sets out to answer. Starting with the discovery of superconductivity over eighty years ago, the book guides the reader through the many years of subsequent exploration, right up to the latest sensational findings.Written in a lively, nontechnical style, this book makes ideal background reading for any school or college-level study of superconductivity. The authors paint detailed pictures of the phenomena involved without mathematical formalism, appealing instead to physical intuition.
Ruthenate And Rutheno Cuprate Materials
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Author : C. Noce
language : en
Publisher: Springer
Release Date : 2008-01-11
Ruthenate And Rutheno Cuprate Materials written by C. Noce and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2008-01-11 with Technology & Engineering categories.
Ruthenate materials have come into focus recently because of their very interesting magnetic and superconducting properties. From the first international conference on this topic, the present volume has emerged as a first coherent account of the considerable body of work, both theoretical and experimental, gathered in this field within a short time span. The book has been written in the form of a set of lectures and tutorial reviews with the aim of providing the research community with both a comprehensive and modern source of reference and a tutorial introduction for postgraduate students and nonspecialists working in related areas.
Modern Aspects Of Superconductivity Theory Of Superconductivity Second Edition
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Author : Sergei Kruchinin
language : en
Publisher: World Scientific
Release Date : 2021-04-14
Modern Aspects Of Superconductivity Theory Of Superconductivity Second Edition written by Sergei Kruchinin and has been published by World Scientific this book supported file pdf, txt, epub, kindle and other format this book has been release on 2021-04-14 with Technology & Engineering categories.
This book is devoted to superconductivity, which is one of the most interesting problems in physics. In accordance with the outline of the book, it treats the key problems in the field of superconductivity, in particular, it discusses the mechanism(s) of superconductivity. This book is useful for researchers and graduate students in the fields of solid state physics, quantum field theory, and many-body theory.
The Superconducting State In Magnetic Fields
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Author : Carlos A. R. Sa de Melo
language : en
Publisher: World Scientific
Release Date : 1998
The Superconducting State In Magnetic Fields written by Carlos A. R. Sa de Melo and has been published by World Scientific this book supported file pdf, txt, epub, kindle and other format this book has been release on 1998 with Science categories.
This volume is an exciting collection of short review articles written by leading international experts on the superconducting state in magnetic fields, a rapidly developing area. The philosophy of the book is to emphasize the importance of having experimental and theoretical works side by side. Every effort has been made to match each experimental article with a corresponding theoretical article. The selection of materials includes special topics, new effects and new trends concerning superconductors in low and high magnetic fields. The special topics and new trends include quantum and classical melting of the vortex lattice, new vortex lattice symmetries, vortex core states, nonlinear Meissner effect, symmetry of the order parameter in high-temperature superconductors, and superconductors in high magnetic fields. The book is targeted at a broad audience, including graduate students, postdocs and other researchers active or interested in this field.
