Journal
PHYSICAL REVIEW B
Volume 82, Issue 17, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.82.174403
Keywords
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Funding
- Basic Energy Sciences, U.S. Department of Energy [DE-AC02-07CH11358]
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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 similar to 45 and similar to 70 kOe. On the low-field side of this region, H > H(c) similar to 45 kOe, the sign of the TEP changes from negative to positive; on the high-field side of this region, H approximate to 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 alpha-log(T). For higher fields, H > 70 kOe, the observed large value of alpha, S(T) = alpha T, is indicative of the heavy fermion state and shows a correlation with C(T)/T.
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