Dresden 2009 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe
TT: Fachverband Tiefe Temperaturen
TT 6: Postersession Correlated Electrons: (General) Theory, Low-Dimensional Systems, Kondo Physics, Heavy Fermions, Quantum-Critical Phenomena
TT 6.52: Poster
Montag, 23. März 2009, 13:00–16:45, P1A
Polarization dependent XAS on CeMIn5 (M=Co, Rh and Ir) and CePt3Si determines crystal-field ground state and sequence of states. — •T. Willers1, A. Severing1, Z. Hu1, N. Hollmann1, P.O. Körner1, H.-J. Lin2, C.T. Chen2, D. Schmitz3, E.D. Bauer4, B. Fak5, G. Lapertot5, and L.H. Tjeng1 — 1Institute of Physics II, University of Cologne — 2NSRRC, Taiwan — 3BESSY, Berlin — 4Los Alamos Nat. Lab., Los Alamos, NM, USA — 5CEA, SPSMS, Grenoble, France
The tetragonal compounds CeMIn5 (P4/mmm) are of interest since the interplay between the antiferromagnetic behaviour of the Ce local moments, an unconventional normal state, and superconducting behaviour of the heavy electrons can be studied [1 and references therein]. The non-centro symmetric system CePt3Si is also tetragonal (P4/mm), becomes antiferromagnetic at 1K and superconducting below 0.7K [2]. In all these compounds the knowledge of the crystal-field potential is crucial for the description of the low temperature properties. Here linear polarized soft X ray absorption data at the Ce-M45 edges of CeMIn5 with M=Co, Rh and Ir and CePt3Si will be presented with the view to elucidate the crystal field schemes of these compounds. Not only the ground state symmetry, but also the sequence of states could be obtained from the temperature dependence of the XAS data. Furthermore the influence of the Kondo effect on the Ce-M45 edges of these compounds will be discussed.
[1] J.L. Sarrao and J.D. Thompson, J. Phys. Soc. Japan 76, 051013 (2007). [2] E. Bauer et al., Physica B 359, 360 (2005).