[Zurück]

P. Gegenwart, Y. Tokiwa, J. Custers, C. Geibel, F. Steglich:
"Magnetic Properties Close to the Quantum Critical Point in YbRh₂Si₂";
Journal of the Physical Society of Japan, 75 (2006), S. 155 - 159.

Proc. of 5th Int. Symposium on ASR-WYP-2005 - Advances in the Physics and Chemistry of Actinide Compounds -
Journal of the Physical Society of Japan
Vol. 75 (2006) Supplement, pp. 155-159

Magnetic Properties Close to the Quantum Critical Point in YbRh₂Si₂

P. Gegenwart*, Y. Tokiwa**, J. Custers, C. Geibel and F. Steglich
Max-Planck Institute for Chemical Physics of Solids, D-01187 Dresden, Germany

The tetragonal heavy fermion system YbRh2Si2 is located very close to a magnetic quantum critical point, related to the suppression of weak antiferromagnetic ordering by a magnetic field of 0.06 T applied in the easy plane perpendicular to the c-axis. Here, we report low-temperature measurements of the magnetic ac-susceptibility and dc-magnetization. A pronounced easy-plane anisotropy in the susceptibility indicates that the tetragonal c-axis is the magnetic hard direction. For fields B⊥c, the isothermal magnetization shows a kink-like structure whose position in field increases with increasing temperature. Corresponding anomalies are observed in the temperature dependence of the ac-susceptibility as well and a new line of anomalies in the temperature-field phase diagram, derived from these experiments, is discussed.

KEYWORDS: quantum critical point, YbRh2Si2

quantum critical point, YbRh2Si2

http://aleph.ub.tuwien.ac.at/F?base=tuw01&func=find-c&ccl_term=AC06588112

http://jpsj.ipap.jp/link?JPSJS/75S/155/