N. Mufti, K. Kaneko, A. Hoser, M. Gutmann, C. Geibel, C. Krellner, O. Stockert
We report on the results of powder and single-crystal neutron diffraction to investigate the magnetic order in YbCo2Si2 below the Néel temperature TN=1.7 K in detail. Two different magnetically ordered phases can clearly be distinguished. At lowest temperatures a commensurate magnetic structure with a propagation vector k1=(0.250.251) is found, while the intermediate phase (T>0.9 K) is characterized by an incommensurate magnetic structure with k2=(0.250.0861). The magnetic structure in YbCo2Si2 is in marked contrast to all other known RCo2Si2 compounds (R = rare earth element) likely due to some itineracy of the Yb 4f states being responsible for the magnetism. © 2016 American Physical Society.
Max-Planck-Institut für Chemische Physik Fester Stoffe, Dresden, 01187, Germany; Department of Physics, State University of Malang, Malang, 65145, Indonesia; Materials Sciences Research Center, Japan Atomic Energy Agency, Tokai, Naka, Ibaraki, 319-1195, Japan; Helmholtz-Zentrum Berlin für Materialien und Energie, Berlin, 14109, Germany; ISIS Neutron and Muon Source, Rutherford Appleton Laboratory, Harwell Oxford, Didcot, OX11 0QX, United Kingdom; Physikalisches Institut, Goethe-Universität Frankfurt, Frankfurt, 60438, Germany
