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Thermal Transport in Strongly Correlated Rare-Earth Intermetallic Compounds.

Author: Heike Pfau
Publisher: Cham : Springer International Publishing, 2016.
Series: Springer theses.
Edition/Format:   eBook : Document : EnglishView all editions and formats
Database:WorldCat
Summary:
This thesis explores thermal transport in selected rare-earth-based intermetallic compounds to answer questions of great current interest. It also sheds light on the interplay of Kondo physics and Fermi surface changes. By performing thermal conductivity and electrical resistivity measurements at temperatures as low as 25mK, the author demonstrates that the Wiedemann- ranz law, a cornerstone of metal physics, is  Read more...
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Genre/Form: Electronic books
Additional Physical Format: Print version:
Pfau, Heike.
Thermal Transport in Strongly Correlated Rare-Earth Intermetallic Compounds.
Cham : Springer International Publishing, ©2016
Material Type: Document, Internet resource
Document Type: Internet Resource, Computer File
All Authors / Contributors: Heike Pfau
ISBN: 9783319395432 3319395432 9783319395425 3319395424
OCLC Number: 956646459
Description: 1 online resource (133 pages).
Contents: Supervisor's Foreword; Abstract; Acknowledgments; Contents; Symbols; Abbreviations; 1 Preamble; Reference; 2 Introduction and Theoretical Background; 2.1 Fermi Liquid; 2.2 The Kondo Effect in 4f Electron Systems; 2.2.1 Single-Ion Kondo Effect; 2.2.2 Kondo Lattice; 2.2.3 RKKY Interaction and Doniach Diagram; 2.3 Classical Phase Transitions; 2.4 Quantum Phase Transitions; 2.5 Topological Transitions; 2.6 Superconductivity; 2.6.1 Properties of Conventional Superconductors; 2.6.2 Properties of Unconventional Superconductors; 2.6.3 Multiband Superconductivity; 2.7 Transport in Solids. 2.7.1 Boltzmann Equation2.7.2 Thermal Conductivity; 2.7.3 Wiedemann-Franz Law; 2.7.4 Thermopower; References; 3 Experimental Techniques for Transport Measurements; 3.1 General Principle of Thermal Transport in a Dilution Refrigerator; 3.2 The Three Set-Ups Used; 3.3 Measurement Procedure --
Steady State; 3.4 Measurement Procedure --
Pseudo AC; 3.5 Origin and Estimation of Measurement Uncertainties; References; 4 The Wiedemann-Franz Law in YbRh2Si2; 4.1 Quantum Criticality in YbRh2Si2 --
Phenomenology; 4.2 Quantum Criticality in YbRh2Si2 --
Theoretical Concepts; 4.2.1 The Kondo-Breakdown Scenario. 4.2.2 The Lifshitz Scenario4.2.3 Critical Quasiparticle Theory; 4.3 Motivation; 4.4 Experimental Methods; 4.5 Thermal and Electrical Transport; 4.5.1 Phonon Contribution; 4.5.2 Low-Temperature Data and the Wiedemann-Franz Law; 4.5.3 Comparison with Results from Other Groups; 4.6 Conclusion; References; 5 Kondo Lattices in Magnetic Field; 5.1 Introduction and Motivation; 5.2 Experimental Methods; 5.3 CeRu2Si2; 5.3.1 The Metamagnetic Transition; 5.3.2 Transport Data; 5.4 YbRh2Si2; 5.4.1 The High-Field Transition; 5.4.2 Transport Data; 5.4.3 Renormalized Band Structure Calculations for YbRh2Si2. 5.5 Rigid-Band-Shift Models for the Field-Induced Transitions in CeRu2Si2 and YbRh2Si25.5.1 Transport Signatures; 5.5.2 Thermodynamic Signatures; 5.6 The Mott Formula in CeRu2Si2 and YbRh2Si2; 5.6.1 General Approach; 5.6.2 Phonon Drag; 5.6.3 Validity in YbRh2Si2 but not in CeRu2Si2; 5.6.4 Comparison of Thermopower and Density of States in YbRh2Si2; 5.6.5 The q Ratio; 5.7 Conclusion; References; 6 The Superconducting Order Parameter of LaPt4Ge12; 6.1 Introduction and Motivation; 6.2 Experimental Methods; 6.3 Resistivity; 6.4 Specific Heat; 6.5 Thermal Conductivity. 6.5.1 T Dependence of the Thermal Conductivity6.5.2 H Dependence of the Thermal Conductivity; 6.5.3 Field-Angle Dependence of the Thermal Conductivity; 6.6 Conclusion; References; 7 Summary and Outlook; Curriculum Vitae; Professional Career; Education; List of Publications.
Series Title: Springer theses.

Abstract:

This thesis explores thermal transport in selected rare-earth-based intermetallic compounds to answer questions of great current interest. It also sheds light on the interplay of Kondo physics and Fermi surface changes. By performing thermal conductivity and electrical resistivity measurements at temperatures as low as 25mK, the author demonstrates that the Wiedemann- ranz law, a cornerstone of metal physics, is violated at precisely the magnetic-field-induced quantum critical point of the heavy-fermion metal YbRh2Si2. This first-ever observation of a violation has dramatic consequences, as it implies a breakdown of the quasiparticle picture. Utilizing an innovative technique to measure low-temperature thermal transport isothermally as a function of the magnetic field, the thesis interprets specific, partly newly discovered, high-field transitions in CeRu2Si2 and YbRh2Si2 as Lifshitz transitions related to a change in the Fermi surface. Lastly, by applying this new technique to thermal conductivity measurements of the skutterudite superconductor LaPt4Ge12, the thesis proves that the system is a conventional superconductor with a single energy gap. Thus, it refutes the widespread speculations about unconventional Cooper pairing in this material.

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