Dresden 2009 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 22: Correlated Electrons: Quantum-Critical Phenomena 2

TT 22.4: Vortrag

Mittwoch, 25. März 2009, 10:30–10:45, HSZ 03

Divergence of the Magnetic Grüneisen Ratio at the Field-Induced Quantum Critical Point in YbRh₂Si₂ — Yoshi Tokiwa^1,2, Teodora Radu¹, •Philipp Gegenwart², Christoph Geibel¹, and Frank Steglich¹ — ¹Max-Planck Institute for Chemical Physics of Solids, D-01187 Dresden — ²I. Physik. Institut, Georg-August Universität Göttingen, Friedrich-Hund Platz 1, 37077 Göttingen

We study quantum criticality in the heavy-fermion metal YbRh₂Si₂ by means of the low-temperature magnetization and specific heat[1]. The magnetic Grueneisen ratio Γ_mag=−(dM/dT)/C is derived, which is found to diverge in the approach of the field-induced quantum critical point. The data are compared with theoretical predictions for quantum criticality in heavy-fermion metals.

[1] T. Tokiwa et al., arXiv:0809.3705v2.