Berlin 2012 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 31: Correlated Electrons: Quantum-Critical Phenomena 2
TT 31.3: Vortrag
Mittwoch, 28. März 2012, 15:30–15:45, H 3010
Crystal Growth and Magnetic Order of Ni-doped CePdAl — •Veronika Fritsch1, Sarah Woitschach2, Oliver Stockert2, and Hilbert v. Löhneysen1,3 — 1Karlsruher Institut für Technologie, Physikalisches Institut, 76131 Karlsruhe, Germany — 2Max-Planck-Institut für Chemische Physik feste Stoffe, 01187 Dresden, Germany — 3Karlsruher Institut für Technologie, Institut für Festkörperphysik, 76344 Karlsruhe, Germany
CePdAl is a stoichiometric, antiferromagnetic compound, which can be tuned to a quantum critical point (QCP) by hydrostatic [1] or chemical pressure [2]. The latter can be achieved by substituting Ni for Pd. Neutron-scattering experiments [3] pointed towards a partial frustration of the Ce moments in CePdAl, making this system a promising candidate for investigating the influence of frustration on quantum criticality. We have grown large single crystals of CePd1−xNixAl by the Czochralski method. The samples were characterized by x-ray powder diffraction, atomic absorption spectroscopy and x-ray Laue diffraction. Magnetization measurements of undoped CePdAl display a strong magnetic anisotropy, which is preserved in the Ni-doped compounds, where the magnetic order is suppressed. Neutron-diffraction experiments indicate that short-range correlations are present well above the Néel temperature TN. Below TN one third of the Ce moments displays short-range order only, confirming the frustration in this system.
[1] T. Goto et al., J. Phys. Chem. of Solids 63, 1159 (2002)
[2] Y. Isikawa et al., J. Phys. Soc. Jpn. 65, 117 (1996)
[3] A. Dönni et al., J. Phys.: Condens. Matter 8, 11213 (1996)