Spin gap and antiferromagnetic fluctuation in spin ladder system doped with nonmagnetic impurities

Nobuyuki Katoh, Yukitoshi Motome, Nobuo Furukawa, Masatoshi Imada

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Abstract

Effects of nonmagnetic impurity doping in a spin ladder system with a spin gap are investigated by the exact diagonalization and the variational Monte Carlo calculations. Small amount of impurity doping generates a nearly free spin bound to each impurity. These nearly free spins interact each other only weakly giving rise to gapless spin excitations. Another important aspect is that short-ranged antiferromagnetic correlation is enhanced especially around the impurity sites. We propose a possible scenario for this drastic change in the spin gapped ladder system. We also compare with the experimental results of Zn-doped SrCu2O3.

Original languageEnglish
Pages (from-to)621-626
Number of pages6
JournalJournal of Low Temperature Physics
Volume105
Issue number3-4
DOIs
Publication statusPublished - 1996 Jan 1

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ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Materials Science(all)
  • Condensed Matter Physics

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