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TT: Fachverband Tiefe Temperaturen

TT 44: Poster Session Correlated Electrons

TT 44.7: Poster

Thursday, March 17, 2011, 10:00–13:00, P1

Magnetic phase transitions in CePdAl — •S. Woitschach¹, O. Stockert¹, V. Fritsch², N. Bagrets², H. v. Löhneysen², and F. Steglich¹ — ¹Max-Planck-Institut CPfS, Dresden, Germany — ²Karlsruher Institut für Technologie, Physikalisches Institut, Karlsruhe, Germany

The heavy fermion system CePdAl in its hexagonal modification shows antiferromagnetic order below T_N=2.7 K and is located close to quantum criticality. By applying hydrostatic pressure or by concentration tuning via alloying Ni on the Pd site, T_N decreases continuously and finally a quantum critical point is approached. In this system geometrical frustration is present, as inferred from neutron scattering, and might play a role in tuning the groundstate. Several magnetically ordered phases have been observed in CePdAl, but so far no detailed measurements of the B-T phase diagram and the magnetic anisotropy have been performed. Here, we report on measurements of the heat capacity of a Czochralski-grown CePdAl single crystal to determine the B-T phase diagram. Especially we focus on the anisotropy for magnetic fields applied along the c-axis or in the basal plane.