Berlin 2012 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 45: Correlated Electrons: Poster Session
TT 45.31: Poster
Donnerstag, 29. März 2012, 15:00–19:00, Poster B
Thermal expansion and magnetostriction of CePdAl single crystals — •Kai Grube1, Sebastian Zaum1,2, Veronika Fritsch2, Sarah Woitschach3, Oliver Stockert3, and Hilbert v. Löhneysen1,2 — 1Karlsruher Institut für Technologie, Institut für Festkörperphysik, 76021 Karlsruhe, Germany — 2Karlsruher Institut für Technologie, Physikalisches Institut, 76131 Karlsruhe, Germany — 3Max-Planck-Institut für Chemische Physik fester Stoffe, 01187 Dresden, Germany
The heavy-fermion compound CePdAl exhibits long-range antiferromagnetic order below TN ≈ 2.7 K. It adopts a hexagonal ZrNiAl-type crystal structure in which the triangular coordination symmetry of the magnetic Ce ions gives rise to geometrical frustration. Neutron diffraction experiments indicate that below TN only two thirds of the Cer ions partcipate in the long-range magnetic order [1]. We have performed thermal expansion and magnetostriction measurements in magnetic fields up to B = 14 T parallel to the c-axis to clarify whether an anisotropic distortion of the unit cell can lift the frustration of the remaining Ce3+ moments. The uniaxial pressure dependence of TN is discussed along with the B-T phase diagram of CePdAl. In addition, the thermal-expansion measurements will be used to look for signs of non-Fermi-liquid behavior induced by the nearby quantum critical point at the onset of magnetic order.
[1] A. Dönni et al., J. Phys.: Condens. Matter 8, 11213 (1996)