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Spin-spin correlation enhanced by impurities in a frustrated two-leg spin ladder

フラストレートした梯子スピン系における不純物による増強されたスピン相関関数

杉本 貴則*; 森 道康  ; 遠山 貴己*; 前川 禎通

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

We theoretically study a spin-spin correlation enhanced by non-magnetic impurities in a frustrated two-leg spin ladder. The frustration is introduced by the next-nearest-neighbor antiferromagnetic interaction in the leg direction in the antiferromagnetic two-leg spin ladder. The spin-spin correlation function around impurity site is calculated by the density-matrix renormalization-group method. We find that the spin-spin correlation is enhanced around impurity site with the wavenumber reflecting the frustration. As increasing the frustration, the wavenumber is shifted from commensurate to incommensurate. We discuss several experimental results on BiCu$$_{2}$$PO$$_{6}$$ in the light of our theory.

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