Breakdown of weak-field magnetotransport at a metallic quantum critical point

Details Breakdown of weak-field magnetotransport at a metallic quantum critical point Breakdown of weak-field magnetotransport at a metallic quantum critical point

2005-07-11

arxiv.org/abs/cond-mat/0507245v1

Phys. Rev. Lett. 95, 247201 (2005)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 3 figures RevTeX format

Scientific paper

10.1103/PhysRevLett.95.247201

We show how the collapse of an energy scale in a quantum critical metal can lead to physics beyond the weak-field limit usually used to compute transport quantities. For a density-wave transition we show that the presence of a finite magnetic field at the critical point leads to discontinuities in the transport coefficients as temperature tends to zero. The origin of these discontinuities lies in the breakdown of the weak field Jones-Zener expansion which has previously been used to argue that magneto-transport coefficients are continuous at simple quantum critical points. The presence of potential scattering and magnetic breakdown rounds the discontinuities over a window determined by tau Delta < 1 where Delta is the order parameter and tau is the quasiparticle elastic lifetime.

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