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

  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},
  volume={109 4},
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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