Effects of impurity in a two-leg spin ladder

2本足スピン背後系における不純物効果

Sugimoto, Takanori; Mori, Michiyasu; Toyama, Takami; Maekawa, Sadamichi

Recent study has shown an impurity-induced magnetic order in a two-leg spin-ladder system BiCu $_{2}$ PO $_{6}$ . They experimentally and numerically investigated effects of non-magnetic impurity by using NMR, and quantum Monte Carlo simulation. The effect can be understood with the picture of local spin freezing emerging in low-dimensional spin-gapped system, e.g. CuGeO $_{3}$ and SrCu $_{2}$ O $_{3}$ . However, inelastic neutron scattering for BiCu $_{2}$ PO $_{6}$ has shown that a strong frustration shifts a wave number of the lowest excitation from commensurate to incommensurate, in contrast with the compounds CuGeO $_{3}$ and SrCu $_{2}$ O $_{3}$ . Thus, the impurity-induced magnetic order may also have an incommensurate wave number. We numerically study effects of impurity on the magnetic excitations in a frustrated two-leg spin-ladder system, in which all magnetic exchange interactions. The dynamical density-matrix renormalization-group method is used to calculate the excitation spectrum in the incommensurate rung-singlet phase. The incommensurate wave number can be observed using inelastic neutron scattering for Zn-doped BiCu $_{2}$ PO $_{6}$ .

使用言語	:	English
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発表会議名	:	1st Conference on Light and Particle Beams in Materials Science 2013 (LPBM 2013)
開催年月	:	2013/08
開催都市	:	Tsukuba
開催国	:	Japan
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受委託・共同研究相手機関	:	科学技術振興機構

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