Dresden 2003 – wissenschaftliches Programm
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TT: Tiefe Temperaturen
TT 14: Postersitzung III (Neue u. unkonventionelle Supraleiter, Anwendungen der Supraleitung, Dünne Schichten, JJs und SQUIDs, Schwere Fermionen, Kondo-Systeme)
TT 14.39: Poster
Mittwoch, 26. März 2003, 14:30–19:00, P2c
Magnetization of YbRh2(Si0.95Ge0.05)2 in low temperature and high magnetic field — •Yoshifumi Tokiwa, Philipp Gegenwart, Julia Ferstl, Octavio Trovarelli, Christoph Geibel und Frank Steglich — Max Planck Institute for Chemical Physics of Solid, 01187 Dresden
We performed the dc-magnetization measurement on a single crystal of NFL compound YbRh2(Si0.95Ge0.05)2 in low temperature down to 80mK and high field up to 11.5T. YbRh2Si2 shows an antiferromagnetic transition at 70mK. A small volume expansion by 5%-Ge doping suppresses the antiferromagnetic transition and tunes the system to QCP. [1] The magnetization data at 80mK shows two anomalies at the field 0.09T and 9.3T. These two anomalies are shown as kinks in magnetization data. The lower field anomaly at 0.09T indicate a ferromagnetic ordering induced by field. This result agrees with NMR study which shows the importance of ferromagnetic fluctuation. [2] The origin of higher field anomaly remains unknown. We will discuss on these anomalous behaviors by comparing with the pure sample of YbRh2Si2.
[1]P. Gegenwart et al., Phys. Rev. Lett. Vol.89, 056402. (2002)
[2]K. Ishida et al., Phys. Rev. Lett. Vol.89, 107202. (2002)