Publication Date:
2016-01-08
Description:
Neutron diffraction measurements of the Cr intercalated niobium diselenide Cr 1∕3 NbSe 2 together with magnetization measurements have revealed that this compound exhibits ferromagnetic ordering below T C = 96 K unlike a chiral helimagnetic order observed in the sulfide compound Cr 1∕3 NbS 2 . As derived from neutron diffraction data, the Cr magnetic moments μ Cr = 2.83 ± 0.03 μ B in Cr 1∕3 NbSe 2 are aligned within basal plane. The discrepancy in the magnetic states of Cr 1∕3 NbS 2 and Cr 1∕3 NbSe 2 is ascribed to the difference in the preferential site occupation of Cr ions in crystal lattices. In Cr 1∕3 NbSe 2 , the Cr ions are predominantly distributed over 2 b Wyckoff site, which determines a centrosymmetric character of the crystal structure unlike Cr 1∕3 NbS 2 , where the Cr ions are mainly located in 2 c position and the crystal structure is non-centrosymmetric.
Print ISSN:
0021-8979
Electronic ISSN:
1089-7550
Topics:
Physics
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