Publication Date:
2015-05-13
Description:
We perform structural analysis experiments on the chiral magnet Cr 1∕3 NbS 2 , in which Cr 3+ ions are inserted between hexagonal NbS 2 layers. The noncentrosymmetrical nature of the inserted Cr 3+ appears as a distorted CrS 6 octahedron. Under the application of hydrostatic pressure, the lattice shrinks significantly along the c -axis rather than the a -axis. However, at a pressure P of approximately 3–4 GPa, a kink in the rate of decrease in the lattice parameters is observed, and the slight movement of a Nb atom along the c -axis brings about a decrease in the distortion of the CrS 6 octahedron. This structural change qualitatively suggests a decrease in the strength of the Dzyaloshinskii-Moriya (D-M) interaction. Under hydrostatic pressure, the magnetic ordering temperature T C decreases, and d T C /d P exhibits a slight change at around 3 GPa. A series of experiments indicates that the change in the structural symmetry of the CrS 6 octahedron influences the exchange network between Cr 3+ ions as well as the D-M interaction.
Print ISSN:
0021-8979
Electronic ISSN:
1089-7550
Topics:
Physics
