Scaling behavior of the thermopower of the archetypal heavy-fermion metal YbRh2Si2  

作　　者：V. R. Shaginyan A. Z. Msezane G. S. Japaridze K. G. Popov J. W. Clark V. A. Khodel 

机构地区：[1]Petersburg Nuclear Physics Institute, NRC Kurchatov Institute, Gatchina, 188300, Russia [2]Clark Atlanta University, Atlanta, GA 30314, USA [3]Komi Science Center, Ural Division, RAS, Syktyvkar, 167982, Russia [4]Department of Physics, St. Petersburg State University, Russia [5]McDonnell Center for the Space Sciences 8J Department of Physics, Washington University, St. Louis, MO 63130, USA [6]Centro de Ciencias Matemdticas, Universidade de Madeira, 9000-390 Funchal, Madeira, Portugal [7]Russian Research Center Kurchatov Institute, Moscow, 123182, Russia

出　　处：《Frontiers of physics》2016年第2期89-95,共7页物理学前沿（英文版）

摘　　要：We reveal and explain the scaling behavior of the thermopower S/T exhibited by the archetypal heavy-fermion （HF） metal YbRh2Si2 under the application of magnetic field B at temperature T. We show that the same scaling is demonstrated by different HF compounds such as/3-YbA1B4 and the strongly correlated layered cobalt oxide [BiBa0.66K0.3602]CoO2. Using YbRh2Si2 as an example, we demonstrate that the scaling behavior of SIT is violated at the antiferromagnetic phase transition, while both the residual resistivity Po and the density of states, N, experience jumps at the phase transition, causing the thermopower to make two jumps and change its sign. Our elucidation is based on flattening of the single-particle spectrum that profoundly affects Po and N. To depict the main features of the SIT behavior, we construct a T-B schematic phase diagram of YbRh2Si2. Our calculated SIT for the HF compounds are in good agreement with experimental facts and support our observations.We reveal and explain the scaling behavior of the thermopower S/T exhibited by the archetypal heavy-fermion （HF） metal YbRh2Si2 under the application of magnetic field B at temperature T. We show that the same scaling is demonstrated by different HF compounds such as/3-YbA1B4 and the strongly correlated layered cobalt oxide [BiBa0.66K0.3602]CoO2. Using YbRh2Si2 as an example, we demonstrate that the scaling behavior of SIT is violated at the antiferromagnetic phase transition, while both the residual resistivity Po and the density of states, N, experience jumps at the phase transition, causing the thermopower to make two jumps and change its sign. Our elucidation is based on flattening of the single-particle spectrum that profoundly affects Po and N. To depict the main features of the SIT behavior, we construct a T-B schematic phase diagram of YbRh2Si2. Our calculated SIT for the HF compounds are in good agreement with experimental facts and support our observations.

关 键 词：thermoelectric and thermomagnetic effects quantum phase transition flat bands non-Fermi-liquid states strongly correlated electron systems heavy fermions 

分 类 号：O412[理学—理论物理] O511[理学—物理]