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Van hove singularity and spontaneous fermi surface symmetry breaking in Sr3Ru2O7

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Yamase,  H.
Department Quantum Many-Body Theory (Walter Metzner), Max Planck Institute for Solid State Research, Max Planck Society;

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Katanin,  A. A.
Department Quantum Many-Body Theory (Walter Metzner), Max Planck Institute for Solid State Research, Max Planck Society;

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Citation

Yamase, H., & Katanin, A. A. (2007). Van hove singularity and spontaneous fermi surface symmetry breaking in Sr3Ru2O7. Journal of the Physical Society of Japan, 76(7): 073706.


Cite as: https://hdl.handle.net/21.11116/0000-000E-B5A0-0
Abstract
The most salient features observed around a metamagnetic transition in Sr3Ru2O7 are well captured in a simple model for spontaneous Fermi surface symmetry breaking under a magnetic field, without invoking a putative quantum critical point. The Fermi surface symmetry breaking happens in both a majority and a minority spin band but with a different magnitude of the order parameter, when either band is tuned close to van Hove filling by the magnetic field. The transition is of second order for high temperature T and changes to first order for low T. The first order transition is accompanied by a metamagnetic transition. The uniform magnetic susceptibility and the specific heat coefficient show strong T dependence, especially a log T divergence at van Hove filling. The Fermi surface instability then cuts off such non-Fermi liquid behavior and gives rise to a cusp in the susceptibility and a specific heat jump at the transition temperature.