Regensburg 2013 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 40: Poster Session Correlated Electrons
TT 40.22: Poster
Mittwoch, 13. März 2013, 15:00–19:00, Poster D
Spin excitations in CePdAl — •S. Woitschach1, O. Stockert1, A. Wildes2, V. Fritsch3, H. v. Löhneysen3, and F. Steglich1 — 1Max-Planck-Institut CPfS, Dresden, Germany — 2Institut Laue-Langevin, Grenoble, France — 3Karlsruher Institut für Technologie, Physikalisches Institut, Karlsruhe, Germany
Hexagonal CePdAl is a geometrically frustrated heavy-fermion compound that orders antiferromagnetically below TN = 2.7 K in an incommensurate structure. Magnetic order can be continuously suppressed, e.g. by Ni doping on the Pd site. At a Ni content of ≈ 14% the transition is fully suppressed and a quantum critical point is reached. Due to geometrical frustration only 2/3 of the magnetic moments show long-range ordering (LRO), while 1/3 only exhibit short-range order (SRO). In thermodynamic measurements a strong anisotropy between the c-axis and the ab-plane has been observed. Here we present our neutron diffraction investigations of the (anisotropic) q-space dependence of the LRO and SRO signal in CePdAl below and above TN.