Magnetic-Field Induced Quantum Critical Point in YbRh$_2$Si$_2$

Details Magnetic-Field Induced Quantum Critical Point in YbRh$_2$Si$_2$ Magnetic-Field Induced Quantum Critical Point in YbRh$_2$Si$_2$

2002-06-15

arxiv.org/abs/cond-mat/0206289v1

Phys. Rev. Lett. 89, 056402 (2002)

Physics

Condensed Matter

Strongly Correlated Electrons

accepted for publication in Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.89.056402

We report low-temperature calorimetric, magnetic and resistivity measurements on the antiferromagnetic (AF) heavy-fermion metal YbRh$_2$Si$_2$ (${T_N =}$ 70 mK) as a function of magnetic field $B$. While for fields exceeding the critical value ${B_{c0}}$ at which ${T_N\to0}$ 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.

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