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Magnetothermal Properties near Quantum Criticality in the Itinerant Metamagnet Sr3Ru2O7

E-BookPDF1 - PDF WatermarkE-Book
145 Seiten
Englisch
Springer Berlin Heidelbergerschienen am25.11.20102010
Our department nominated this thesis for a Springer award because we regard it as an outstanding piece of work, carried out with a remarkable level of independence. Andreas Rost joined us in 2005, as one of the inaugural Prize Students of the Scottish Universities Physics Alliance. Our research group has been working on Sr Ru O , in collaboration with our colleagues in the group of Professor Y. Maeno 3 2 7 at Kyoto, since 1998. By early 2005 we had tantalising evidence that a novel phase was forming at very low temperatures, in an overall phase diagram dominated by quantum ?uctuations. We knew that comprehensive thermodynamic information would be needed in order to understand how this was happening, and that the demanding constraints of low temperature and high magnetic ?eld meant that bespoke apparatus would need to be constructed. Andreas had studied the speci?c heat of glasses below 50 mK during his diploma thesis work at Heidelberg, and was brimming with ideas about how to proceed. We gave him advice, and constantly discussed the physics with him, but quickly realised that the best way to proceed practically was to give him a budget, and let him take the main design decisions, double-checking with us from time to time.mehr
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Produkt

KlappentextOur department nominated this thesis for a Springer award because we regard it as an outstanding piece of work, carried out with a remarkable level of independence. Andreas Rost joined us in 2005, as one of the inaugural Prize Students of the Scottish Universities Physics Alliance. Our research group has been working on Sr Ru O , in collaboration with our colleagues in the group of Professor Y. Maeno 3 2 7 at Kyoto, since 1998. By early 2005 we had tantalising evidence that a novel phase was forming at very low temperatures, in an overall phase diagram dominated by quantum ?uctuations. We knew that comprehensive thermodynamic information would be needed in order to understand how this was happening, and that the demanding constraints of low temperature and high magnetic ?eld meant that bespoke apparatus would need to be constructed. Andreas had studied the speci?c heat of glasses below 50 mK during his diploma thesis work at Heidelberg, and was brimming with ideas about how to proceed. We gave him advice, and constantly discussed the physics with him, but quickly realised that the best way to proceed practically was to give him a budget, and let him take the main design decisions, double-checking with us from time to time.
Details
Weitere ISBN/GTIN9783642145247
ProduktartE-Book
EinbandartE-Book
FormatPDF
Format Hinweis1 - PDF Watermark
FormatE107
Erscheinungsjahr2010
Erscheinungsdatum25.11.2010
Auflage2010
ReiheSpringer Theses
Seiten145 Seiten
SpracheEnglisch
IllustrationenX, 145 p.
Artikel-Nr.1717272
Rubriken
Genre9200

Inhalt/Kritik

Inhaltsverzeichnis
1;Supervisor s Foreword;6
2;Acknowledgments;8
3;Contents;10
4;Introduction;12
4.1;References;15
5;Background Physics;17
5.1;2.1 Itinerant Electron Systems;17
5.1.1;2.1.1 Non-Interacting Electron Theory;18
5.1.2;2.1.2 Magnetic Field Effects;22
5.1.3;2.1.3 Electric Transport;27
5.1.4;2.1.4 The Fermi Liquid;28
5.1.5;2.1.5 Beyond the Fermi Liquid;30
5.2;2.2 The Physics of the Ruthenate Family;34
5.2.1;2.2.1 Crystal Structure and Synthesis;34
5.2.2;2.2.2 Thermodynamic Properties and Magnetic Phase Diagram;35
5.2.3;2.2.3 Electronic Structure Properties;44
5.3;2.3 Summary;51
5.4;References;52
6;Thermodynamic Measurements of Entropy;55
6.1;3.1 General Considerations on Thermodynamics in Magnetic Fields;56
6.1.1;3.1.1 The Laws of Thermodynamics for Magnetic Systems;56
6.1.2;3.1.2 Phase Transitions;59
6.2;3.2 Experimental Consequences;60
6.2.1;3.2.1 Principle of Specific Heat Measurements;61
6.2.2;3.2.2 Magnetocaloric Measurements;66
6.3;References;73
7;Design and Characterisation of Novel Experimental Setup;75
7.1;4.1 Measurement Environment and Sample Holder;75
7.2;4.2 Design of Experimental Setup;77
7.2.1;4.2.1 Design Goals and Experimental Realisation;77
7.2.2;4.2.2 Sample Platform and Thermal Bath;78
7.2.3;4.2.3 Thermometer;80
7.2.4;4.2.4 Heater;81
7.2.5;4.2.5 Estimates of Thermal Performance;82
7.3;4.3 Thermometry;85
7.3.1;4.3.1 Physical Properties of Thermometers;85
7.3.2;4.3.2 Thermometer Calibration;88
7.4;4.4 Characterisation Run With Sr2RuO4;92
7.4.1;4.4.1 Sample;93
7.4.2;4.4.2 Specific Heat in Field;93
7.4.3;4.4.3 Specific Heat at Zero Field;96
7.4.4;4.4.4 Magnetocaloric Oscillations;96
7.5;4.5 Characteristics and Details of Measurements on Sr3Ru2O7 ;98
7.5.1;4.5.1 Sample Selection;98
7.5.2;4.5.2 Thermal Link;99
7.5.3;4.5.3 Specific Heat;100
7.6;References;101
8;Experimental Results and Discussion;103
8.1;5.1 Caloric Studies of Magnetic Phase Transitions in Sr3Ru2O7;104
8.1.1;5.1.1 Evolution of Entropy across Phase Transitions as a Function of Field;104
8.1.2;5.1.2 Specific Heat Signature of Phase Transitions;111
8.1.3;5.1.3 Discussion;114
8.2;5.2 The Low and High Field States of Sr3Ru2O7 ;122
8.2.1;5.2.1 The Low Field Fermi Liquid State;122
8.2.2;5.2.2 The High Field Fermi Liquid State;127
8.2.3;5.2.3 Discussion;129
8.3;References;139
9;Conclusions and Future Work;142
9.1;References;146
10;Appendices;148
10.1;7.1 Appendix A: Material Properties;148
10.2;7.2 Appendix B: Angular Dependence of the Magnetocaloric Signal;148
10.2.1;7.2.1 Study at 19 ;150
10.2.2;7.2.2 Study in the ab-Plane;151
10.3;References;153mehr