Impurity-induced magnetic order in the mixture of two spin gap systems (CH3)2CHNH3CuCl3 and (CH3)2CHNH3CuBr3

Abstract The ground state of the solid solution of the two spin gap systems (CH 3 ) 2 CHNH 3 CuCl 3 and (CH 3 ) 2 CHNH 3 CuBr 3 has been investigated by 1 H NMR. The existence of a magnetic ordering in the sample with the Cl-content x =0.85 was clearly demonstrated by a drastic splitting in a resonance line at low temperatures below T N =13.5 K. The observed NMR spectra in the ordered state was qualitatively consistent with the simple antiferromagnetic state.