Chlorine NMR in the Re-Entrant Spin-Glass State of the Quasi-Two-Dimensional XY System Rb2Mn1-xCrxCl4

Abstract

Cl 35 NMR measurements are carried out at 1.7 K on a random mixture of quasi-two-dimensional ferro- and antiferromagnets Rb 2 Mn 1- x Cr x Cl 4 ( 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.