We present linear polarization-dependent soft x-ray absorption spectroscopy data at the Ce M4,5 edges of Cd and Sn doped CeCoIn5. The 4f ground state wave functions have been determined for their superconducting, antiferromagnetic and paramagnetic ground states. The absence of changes in the wave functions in CeCo(In1−xCdx)5 suggests the 4f\,--\,conduction electron (cf) hybridization is not affected by globally Cd doping, thus supporting the interpretation of magnetic droplets nucleating long range magnetic order. This is contrasted by changes in the wave function due to Sn substitution. Increasing Sn in CeCo(In1−ySny)5 compresses the 4f orbitals into the tetragonal plane of these materials, suggesting enhanced cf hybridization with the in-plane In(1) atoms and a homogeneous altering of the electronic structure. As these experiments show, the 4f wave functions are a very sensitive probe of small changes in the hybridization of 4f and conduction electrons, even conveying information about direction dependencies.
@article{arxiv.1709.06830,
title = {Evolution of ground state wave function in CeCoIn$_5$ upon Cd or Sn doping},
author = {K. Chen and F. Strigari and M. Sundermann and Z. Hu and Z. Fisk and E. D. Bauer and P. F. S. Rosa and J. L. Sarrao and J. D. Thompson and J. Herrero-Martin and E. Pellegrin and D. Betto and K. Kummer and A. Tanaka and S. Wirth and A. Severing},
journal= {arXiv preprint arXiv:1709.06830},
year = {2018}
}