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

P. Gegenwart; J. Custers; C. Geibel; K. Neumaier; T. Tayama; K. Tenya; O. Trovarelli; F. Steglich

doi:10.1103/PhysRevLett.89.056402

paper

Magnetic-Field Induced Quantum Critical Point in YbRh $_{2}$ Si $_{2}$

arXiv:cond-mat/0206289 · doi:10.1103/PhysRevLett.89.056402

Abstract

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 $B_{c 0}$ at which $T_{N} \to 0$ the low temperature resistivity shows an $A T^{2}$ dependence, a $1/ (B - B_{c 0})$ divergence of $A (B)$ upon reducing $B$ to $B_{c 0}$ 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.

accepted for publication in Phys. Rev. Lett

Magnetic-Field Induced Quantum Critical Point in YbRh2​Si2​

Abstract

Magnetic-Field Induced Quantum Critical Point in YbRh $_{2}$ Si $_{2}$