¹H-NMR Study on the Magnetic Order in the Mixture of Two Spin Gap Systems (CH₃)₂CHNH₃CuCl₃ and (CH₃)₂CHNH₃CuBr₃

Abstract

The antiferromagnetic ordering in the solid-solution of the two spin-gap systems (CH₃)₂CHNH₃CuCl₃ and (CH₃)₂CHNH₃CuBr₃ has been investigated by ¹H-NMR. The sample with the Cl-content ratio x=0.85 showed a clear splitting in spectra below T_N=13.5 K, where the spin–lattice relaxation rate T₁⁻¹ showed a diverging behavior. The critical exponent of the temperature dependence of the hyperfine field is found to be 0.33.