Chlorine NMR in the Re-Entrant Spin-Glass State of the Quasi-Two-Dimensional XY System Rb₂Mn_1−xCr_xCl₄

抄録

Cl³⁵ NMR measurements are carried out at 1.7 K on a random mixture of quasi-two-dimensional ferro- and antiferromagnets Rb₂Mn_1−xCr_xCl₄ (x=1.0, 0.9, 0.8). NMR spectra of x=1.0 and 0.9 in zero applied field show that these compounds are ferromagnetic. In the re-entrant spin-glass state of x=0.8 a satellite line is observed together with the main lines. It is pointed out from the analysis of the results that, in the re-entrant spin-glass state, the ferromagnetic moments coexist with the moments whose directions homogeneously distribute in the c-plane, such as vortices.