YbRh2Si2: Quantum tricritical behavior in itinerant electron systems

Details YbRh2Si2: Quantum tricritical behavior in itinerant electron systems YbRh2Si2: Quantum tricritical behavior in itinerant electron systems

2007-10-17

arxiv.org/abs/0710.3260v2

J. Phys. Soc. Jpn. 77 (2008) 093712

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 3 figures

Scientific paper

10.1143/JPSJ.77.093712

We propose that proximity of the first-order transition manifested by the quantum tricritical point (QTCP) explains non-Fermi-liquid properties of YbRh2Si2. Here, at the QTCP, a continuous phase transition changes into first order at zero temperature. The non-Fermi-liquid behaviors of YbRh2Si2 are puzzling in two aspects; diverging ferromagnetic susceptibility at the antiferromagnetic transition and unconventional power-law dependence in thermodynamic quantities. These puzzles are solved by an unconventional criticality derived from our spin fluctuation theory for the QTCP.

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