TY  - JOUR
AU  - Xiao, Y.
AU  - Su, Y.
AU  - Li, H.-F.
AU  - Kumar, C. M. N.
AU  - Mittal, R.
AU  - Persson, J.
AU  - Senyshyn, A.
AU  - Gross, K.
AU  - Brückel, T.
TI  - Neutron diffraction investigation of the crystal and magnetic structures in KCrF3 perovskite
JO  - Physical review / B
VL  - 82
IS  - 9
SN  - 1098-0121
CY  - College Park, Md.
PB  - APS
M1  - PreJuSER-11329
SP  - 094437
PY  - 2010
N1  - Record converted from VDB: 12.11.2012
AB  - KCrF3 represents another prototypical orbital-ordered perovskite, where Cr2+ possesses the same electronic configuration of 3d(4) as that of strongly Jahn-Teller distorted Mn3+ in many colossal magnetoresistance manganites. The crystal and magnetic structures of KCrF3 compound are investigated by using polarized and unpolarized neutron powder-diffraction methods. The results show that the KCrF3 compound crystallizes in tetragonal structure at room temperature and undergoes a monoclinic distortion with the decrease in temperature. The distortion of the crystal structure indicates the presence of cooperative Jahn-Teller distortion which is driven by orbital ordering. With decreasing temperature, four magnetic phase transitions are observed at 79.5, 45.8, 9.5, and 3.2 K, which suggests a rich magnetic phase diagram. Below T-N = 79.5 K, the Cr2+ moment orders in an incommensurate antiferromagnetic arrangement, which can be defined by the magnetic propagation vector (1/2 + delta, 1/2 + delta, 0). The incommensurate-commensurate magnetic transition occurs at 45.8 K and the magnetic propagation vector locks into (1/2, 1/2, 0) with the Cr moment of 3.34(5) mu(B), aligned ferromagnetically in (220) plane, but antiferromagnetically along [110] direction. Below 9.5 K, the canted antiferromagnetic ordering and weak ferromagnetism arise from the collinear antiferromagnetic structure while the Dzyaloshinskii-Moriya interaction and tilted character of the single-ion anisotropy might give rise to the complex magnetic behaviors below 9.5 K.
KW  - J (WoSType)
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000282097200002
DO  - DOI:10.1103/PhysRevB.82.094437
UR  - https://juser.fz-juelich.de/record/11329
ER  -