High-Field Magnetization Study of the Doping Effect of Magnetic Impurity on the Organic Spin-Peierls System: $p$-CyDOV Radical Crystal

概要

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The field dependence of the magnetization ($H=0{\mathendash} 55$ T) of the mixed verdazyl radical crystals, ($ p$-CyDOV)1-x($ p$-CyDTV)x ($x=0$, 0.01, 0.02, 0.03, 0.05, and 0.07) was measured to study the doping effect of magnetic impurity ($ p$-CyDTV) on the organic spin-Peierls (SP) system, 3-(4-cyanophenyl)-1,5-dimethyl-6-oxoverdazyl ($ p$-CyDOV) radical crystal, where the ${>}$C=O group in $p$-CyDOV is replaced by the ${>}$C=S group in $p$-CyDTV. The effect of doping on SP system is very remarkable. We have found that the high-field magnetization $M(x,H)$ curves of the doped organic SP system below $T_{\text{SP}}=15.0$ K can be well explained by the sum of the magnetization ($M$) of the spin-Peierls state ($C_{\text{SP}}(x)M_{\text{SP}}(H)$), one dimensional (1D) Heisenberg antiferromagnet ($C_{\text{1D-HAF}}(x)M_{\text{1D-HAF}}(H)$), and Curie impurity ($C_{\text{Curie}}(x)M_{\text{Curie}}(H)$), where $C_{\text{i}}(x)$ is the fraction of the $i$ th contribution. The result suggests the coexistence of SP state and antiferromagnetic long-range order in the doped $p$-CyDOV radical system at low temperature.
Physical Society of Japanの論文
2002-10-15