Effects of Nonmagnetic Impurity Doping on Spin Ladder System

Youichirou Iino, Masatoshi Imada

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)


Effects of nonmagnetic impurity doping on an antiferromagnetic spin-1/2 Heisenberg ladder system are studied by the quantum Monte Carlo method. A single nonmagnetic impurity induces a localized spin-1/2 moment accompanied by static and enhanced antiferromagnetic correlations around it. A small and finite concentration of impurities induces a remarkable change of magnetic and thermodynamic properties with gapless excitations. It also shows rather sharp but continuous crossover around a impurity concentration of about 4%. Above the crossover concentration, all the spins are strongly coupled, participating in the enhanced and rather uniform power-law decay of the antiferromagnetic correlation. Below the crossover concentration, each impurity forms an antiferromagnetically correlated cluster only weakly coupled each other. For random distribution of impurities, large Curie-like susceptibility accompanied with small residual entropy is obtained at low temperatures, in agreement with recent experimental observation in Zn-doped SrCu2O3. The temperature dependence of antiferromagnetic susceptibility shows power-law-like but weaker divergence than the single chain antiferromagnet in the temperature range studied.

Original languageEnglish
Pages (from-to)3728-3731
Number of pages4
Journaljournal of the physical society of japan
Issue number12
Publication statusPublished - 1996
Externally publishedYes


  • Crossover
  • Impurity effect
  • Quantum Monte Carlo method
  • Randomness
  • Spin gap
  • Spin ladder system
  • SrCuO

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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