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

TL;DR

This study uses 1H-NMR to investigate antiferromagnetic order in a solid-solution of two spin-gap systems, revealing a clear transition at 13.5 K with critical behavior consistent with magnetic ordering.

Contribution

It provides the first detailed NMR analysis of magnetic ordering in a mixed spin-gap system with varying halide content.

Findings

Antiferromagnetic order observed at 13.5 K in the mixture.

Spectral splitting indicates magnetic transition.

Critical exponent of 0.33 suggests universality class.

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 TN=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.