Unique magnetic structure of YbCoSi

Mufti, N.*; 金子 耕士; Hoser, A.*; Gutmann, M.*; Geibel, C.*; Krellner, C.*; Stockert, O.*

Physical Review B, 94(4), p.045116_1 - 045116_8, 2016/07

AA2015-0370.pdf:1.33MB

https://doi.org/10.1103/PhysRevB.94.045116

We report on the results of powder and single crystal neutron diffraction to investigate the magnetic order in YbCoSi below the Nel temperature ,K in detail. Two different magnetically ordered phases can clearly be distinguished. At lowest temperatures a commensurate magnetic structure with a propagation vector is found, while the intermediate phase (,K) is characterized by an incommensurate magnetic structure with . The magnetic structure in YbCoSi is in marked contrast to all other known CoSi compounds ( = rare earth element) likely due to some itineracy of the Yb 4f states being responsible for the magnetism.