Impurity Effect on Spin Ladder System

Details Impurity Effect on Spin Ladder System Impurity Effect on Spin Ladder System

Publishing date

1996-05-08

URL

arxiv.org/abs/cond-mat/9605048v1

Science

Physics

Field

Condensed Matter

Additional info

14 pages LaTeX including 5 PS figures

Type

Scientific paper

Digital Object Identifier

10.1143/JPSJ.65.1949

Abstract

Effects of nonmagnetic impurity doping in a spin ladder system with a spin gap are investigated by the exact diagonalization as well as by the variational Monte Carlo calculations. Substantial changes in macroscopic properties such as enhancements in spin correlations and magnetic susceptibilities are observed in the low impurity concentration region, which are caused by the increase of low-energy states. These results suggest that small but finite amount of nonmagnetic impurity doping relevantly causes the reduction or the vanishment of the spin gap. This qualitatively explains the experimental result of Zn-doped SrCu$_{2}$O$_{3}$ where small doping induces gapless nature. We propose a possible scenario for this drastic change as a quantum phase transition in a spin gapped ladder system due to spinon doping effects.

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