Impurity Effect on Spin Ladder System
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概要
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Effects of nonmagnetic impurity doping in 8. spin ladder system with a spin gap are investi-gated by exact diagonalization and variational Monte Carlo calculations. Substantial changes intnacroscopic properties such as enhancements in spin correlations and magnetic sttsceptibilitiesare observed in the low impurity concentration region, which are due to an increase of low-energystates. These results suggest that a small but finite arnovxnt of nonrnagnetic impurity dopingcatrses reduction or disappearance of the spin gap. This qualitative[y explains the experimentalresults for Zn-doped SrCuzOa in which a small amount of doping results in disappearance of thespin gap. We propose a possible scenario for this rnarked change as a quantum phase transitionin a spin-gap ladder systern due to spinon doping effects,
- 社団法人日本物理学会の論文
- 1996-07-15
著者
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Imada Masatoshi
Institute For Solid State Physics University Of Tokyo
-
Motome Yukitoshi
Institute For Solid State Physics University Of Tokyo
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Furukawa Nobuo
Institute For Sokid State Physics University Of Tokyo
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KATOH Nobuyuki
Institute for Solid State Physics,University of Tokyo
-
Imada Masatoshi
Institute For Solid State Physics The University Of Tokyo
-
Katoh Nobuyuki
Institute For Solid State Physics University Of Tokyo
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