期刊
PHYSICAL REVIEW B
卷 72, 期 17, 页码 -出版社
AMERICAN PHYSICAL SOC
DOI: 10.1103/PhysRevB.72.172413
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We report the results of a low-temperature (T >= 50 mK) and high-field (H <= 180 kOe) study of the Hall resistivity in single crystals of YbAgGe, a heavy-fermion compound that demonstrates field-induced non-Fermi-liquid behavior near its field-induced quantum critical point. Distinct features in the anisotropic, field-dependent Hall resistivity sharpen on cooling down and at the base temperature are close to the respective critical fields for the field-induced quantum critical point. The field range of the non-Fermi-liquid region decreases on cooling but remains finite at the base temperature with no indication of its conversion to a point for T -> 0. At the base temperature, the functional form of the field-dependent Hall coefficient is field-direction-dependent and complex beyond existing simple models, thus reflecting the multicomponent Fermi surface of the material and its nontrivial modification at the quantum critical point.
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