Document Type

Article

Publication Date

11-2-2010

Journal or Book Title

Physical Review B

Volume

82

First Page

174403

DOI

10.1103/PhysRevB.82.174403

Abstract

The magnetic field and temperature dependences of the thermoelectric power (TEP) of the antiferromagnetically ordered heavy fermion compound YbAgGe are measured across the field-induced quantum critical point. These TEP measurements reproduce the earlier H-T phase diagram and identify an additional domelike phase between ∼45and ∼70 kOe. On the low-field side of this region, H>Hc∼45 kOe, the sign of the TEP changes from negative to positive; on the high-field side of this region, H≈70 kOe, a non-Fermi-liquid state is evidenced as the logarithmic temperature dependence of S(T)/T, in agreement with previous specific heat results C(T)/T∝−log(T). For higher fields, H>70 kOe, the observed large value of α, S(T)=αT, is indicative of the heavy fermion state and shows a correlation with C(T)/T.

Comments

This article is from Physical Review B 82 (2010): 174403, doi:10.1103/PhysRevB.82.174403.

Copyright Owner

American Physical Society

Language

en

File Format

application/pdf

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