Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2007-06-06
Physics
Condensed Matter
Strongly Correlated Electrons
4 pages, 2 figures, to be published in J. Phys. Soc. Jpn. vol.76 (2007) No.8
Scientific paper
10.1143/JPSJ.76.083701
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.
Adachi Tadashi
Goto Tomotsugu
Kanada Keishi
Oosawa Akira
Saito Takesi
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