# Determining the in-plane orientation of the ground-state orbital of CeCu2Si2.

@article{Willers2012DeterminingTI,
title={Determining the in-plane orientation of the ground-state orbital of CeCu2Si2.},
author={Thomas Willers and Fabio Strigari and Nozomu Hiraoka and Y. Q. Cai and Maurits W. Haverkort and K-D. Tsuei and Yen Fa Liao and Silvia Seiro and C. Geibel and Frank Steglich and Liu Hao Tjeng and Andrea Severing},
journal={Physical review letters},
year={2012},
volume={109 4},
pages={
046401
}
}
• Published 9 May 2012
• Physics
• Physical review letters
We have successfully determined the hitherto unknown sign of the B(4)(4) Stevens crystal-field parameter of the tetragonal heavy-fermion compound CeCu(2)Si(2) using vector q-dependent nonresonant inelastic x-ray scattering experiments at the cerium N(4,5) edge. The observed difference between the two different directions, q∥[100] and q∥[110], is due to the anisotropy of the crystal-field ground state in the (001) plane and is observable only because of the utilization of higher than dipole…

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