Berlin 2012 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 31: Correlated Electrons: Quantum-Critical Phenomena 2
TT 31.2: Vortrag
Mittwoch, 28. März 2012, 15:15–15:30, H 3010
Thermodynamics of Phase Formation and Heavy Quasiparticles in Sr3Ru2O7 — •Andreas W. Rost1, Santiago A. Grigera1,2, Jan A.N. Bruin1, Robin S. Perry3, Demian Tian1, Sri Raghu4, Steve A. Kivelson5, and Andrew P. Mackenzie1 — 1SUPA, School of Physics and Astronomy, University of St Andrews, St Andrews KY169SS, UK — 2Instituto de Física de Líquidos y Sistemas Biológicos, UNLP-CONICET, La Plata 1900, Argentina — 3SUPA, School of Physics, University of Edinburgh, Mayfield Road, Edinburgh EH93JZ, UK — 4Department of Physics and Astronomy, Rice University, Houston, Texas, 77005, USA — 5Department of Physics, Stanford University, Stanford, California, 94305, USA
The itinerant metamagnet Sr3Ru2O7 has motivated a wide range of experimental and theoretical work in recent years because of the discovery of an unusual low temperature phase which is forming in the vicinity of a proposed quantum critical point. A major challenge is the investigation of the thermodynamic properties of both this unusual phase and the fluctuations associated with the quantum critical point. Here we will report on new specific heat measurements extending previous work to the wider phase diagram. Our results shed light on two important aspects of the system. First we will discuss the entropic details of the formation of heavy quasiparticles as a function of temperature in this compound relevant for a wide class of materials. Secondly we will present thermodynamic evidence for the anomalous low temperature phase forming directly out of the critical high temperature phase.