Multiple regions of quantum criticality in YbAgGe

Details Multiple regions of quantum criticality in YbAgGe Multiple regions of quantum criticality in YbAgGe

2011-02-23

arxiv.org/abs/1102.4867v1

Physics

Condensed Matter

Strongly Correlated Electrons

Scientific paper

Dilation and thermopower measurements on YbAgGe, a heavy-fermion antiferromagnet, clarify and refine the magnetic ?field-temperature (H-T) phase diagram and reveal a field-induced phase with T-linear resistivity. On the low-H side of this phase we find evidence for a first-order transition and suggest that YbAgGe at 4.5 T may be close to a quantum critical end point. On the high-H side our results are consistent with a second-order transition suppressed to a quantum critical point near 7.2 T. We discuss these results in light of global phase diagrams proposed for Kondo lattice systems.

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