1. Physikalisches InstitutKarlsruhe Institute of Technology P.O. Box 6980 Karlsruhe 76049 Germany
2. Fundamental Science on Nuclear Wastes and Environmental Safety LaboratorySouthwest University of Science and Technology Mianyang 621010 P. R. China
3. Hochfeld‐Magnetlabor Dresden and Würzburg‐Dresden Cluster of Excellence ct.qmatHelmholtz‐Zentrum Dresden‐Rossendorf Dresden 01328 Germany
4. Institut für Festkörper‐ und MaterialphysikTU Dresden Dresden 01062 Germany
5. Institut für FestkörperphysikKarlsruhe Institute of Technology P.O. Box 3640 Karlsruhe 76021 Germany
6. Center for Condensed Matter and Materials PhysicsDepartment of PhysicsBeihang University Beijing 100191 P. R. China