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¹H-NMR Study of the Random Bond Effect in the Quantum Spin System (CH₃)₂CHNH₃Cu(Cl_xBr_(1-x))₃

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arxiv 0706.0766 v2 pith:RKAIZZ3J submitted 2007-06-06 cond-mat.str-el

¹H-NMR Study of the Random Bond Effect in the Quantum Spin System (CH₃)₂CHNH₃Cu(Cl_xBr_(1-x))₃

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Spin-lattice relaxation rate $T_1^{-1}$ of $^1$H-NMR has been measured in (CH$_3$)$_2$CHNH$_3$Cu(Cl$_x$Br$_{1-x}$)$_3$ with $x=0.88$, which has been reported to be gapped system with singlet ground state from the previous macroscopic magnetization and specific heat measurements, in order to investigate the bond randomness effect microscopically in the gapped composite Haldane system (CH$_3$)$_2$CHNH$_3$CuCl$_3$. It was found that the spin-lattice relaxation rate $T_1^{-1}$ in the present system includes both fast and slow relaxation parts indicative of the gapless magnetic ground state and the gapped singlet ground state, respectively. We discuss the obtained results with the previous macroscopic magnetization and specific heat measurements together with the microscopic $\mu$SR experiments.

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