Magnetic-field induced quantum critical point in YbRh2Si2 -: art. no. 056402
Magnetic-field induced quantum critical point in YbRh2Si2 -: art. no. 056402
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DOI:
10.1103/physrevlett.89.056402
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发表时间:
2002-07-29
影响因子:
8.6
通讯作者:
Steglich, F
中科院分区:
文献类型:
--
作者:
Gegenwart, P;Custers, J;Steglich, F
We report low-temperature calorimetric, magnetic, and resistivity measurements on the antiferromagnetic (AF) heavy-fermion metal YbRh2Si2 ( T-N=70 mK) as a function of magnetic field B. While for fields exceeding the critical value B-c0 at which T-N-->0 the low-temperature resistivity shows an AT(2) dependence, a 1/(B-B-c0) divergence of A(B) upon reducing B to B-c0 suggests singular scattering at the whole Fermi surface and a divergence of the heavy quasiparticle mass. The observations are interpreted in terms of a new type of quantum critical point separating a weakly AF ordered from a weakly polarized heavy Landau-Fermi liquid state.