Dresden 2009 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 43: Correlated Electrons: Heavy Fermions 2
TT 43.8: Vortrag
Donnerstag, 26. März 2009, 17:45–18:00, HSZ 301
Polarization dependent Ce-M45 x ray absorption spectroscopy on the giant crystal-field material CeRh3B2. — •P.O. Körner1, A. Severing1, T. Willers1, Z. Hu1, N. Hollmann1, H. Fujiwara1, H.-J. Lin2, C.T. Chen2, P. Lejay3, and L.H. Tjeng1 — 1Institute of Physics, II University of Cologne — 2NSRRC, Taiwan — 3Institut Néel, CNRS, Grenoble
The hexagonal compound CeRh3B2 exhibits exceptional magnetic properties (TC=115 K, µord=0.4µB) [1 and references therein]. The crystal-field splitting in this material is of the order of the spin orbit splitting so that the Steven’s approximation is no longer valid. Neutron scattering combined with magnetization suggests a crystal-field level scheme where the intermixing of the higher lying multiplet contributes substantially to the ground state [1]. We have investigated the crystal-field splitting in CeRh3B2 with soft-x-ray absorption spectroscopy at the Ce-M45 edges. This technique is sensitive to the symmetry of the initial state and through the polarization dependence direct spectroscopic information about the |Jz⟩ admixtures of the ground state is obtained [2]. In contrast to previous linear dichroism studies by Jo et al. we are taking the full crystal-field symmetry into account [3]. Our results for the ground state are consistent with [1], but we find a different level scheme providing better understanding of the anisotropies.
[1] F. Givord et al. J. Phys. Condens. Mater 19, 506210 (2007).
[2] P. Hansmann et al. , Phys. Rev. Lett. 100, 066405 (2008).
[3] T. Jo, Prog. Theor. Phys. Suppl. 101, 303 (1990) and T. Jo and S. Imada, J. Phys. Soc. Jpn. 59, 2312 (1990)