Chin. Phys. Lett.  2016, Vol. 33 Issue (03): 037201    DOI: 10.1088/0256-307X/33/3/037201
CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
Microscopic Theory of the Thermodynamic Properties of Sr$_3$Ru$_2$O$_7$
Wei-Cheng Lee1,2, Congjun Wu1**
1Department of Physics, University of California, San Diego, California, 92093, USA
2Department of Physics, Applied Physics, and Astronomy, Binghamton University-State University of New York, Binghamton, USA
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Wei-Cheng Lee, Congjun Wu 2016 Chin. Phys. Lett. 33 037201
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Abstract

The thermodynamic properties of the bilayer ruthenate compound Sr$_3$Ru$_2$O$_7$ at very low temperatures are investigated by using a tight-binding model yielding the realistic band structure combined with the on-site interactions treated at the mean-field level. We find that both the total density of states at the Fermi energy and the entropy exhibit a sudden increase near the critical magnetic field for the nematic phase, echoing the experimental findings. A new mechanism to explain the anisotropic transport properties is proposed based on scatterings at the anisotropic domain boundaries. Our results suggest that extra cares are necessary to isolate the contributions due to the quantum criticality from the band structure singularity in Sr$_3$Ru$_2$O$_7$.

Received: 12 February 2016      Published: 31 March 2016
PACS:  72.80.Ga (Transition-metal compounds)  
  73.20.-r (Electron states at surfaces and interfaces)  
  71.10.Fd (Lattice fermion models (Hubbard model, etc.))  
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https://cpl.iphy.ac.cn/10.1088/0256-307X/33/3/037201       OR      https://cpl.iphy.ac.cn/Y2016/V33/I03/037201
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Wei-Cheng Lee
Congjun Wu
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