2004/06/17 by Hitoshi Seo, Yukitoshi Motome, Naoto Nagaosa
Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Magnetic and transport properties of perovskites and related materials #Physics of Superconductivity and Magnetism #cond-mat.stat-mech #cond-mat.str-el
paper · pdf · doi:10.1103/physrevb.70.060403
published as Phys. Rev. B 70, 060403 (2004) · 5 pages including 5 figures
arxiv created 2004/06/17 · openalex publication_date 2004/08/13 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
Effects of disorder and external field on the competing spin-Peierls and antiferromagnetic states are studied theoretically in terms of the numerical transfer matrix method applied to a quasi-one-dimensional spin 1∕2 Heisenberg model coupled to the lattice degree of freedom. We show that, at temperatures above the impurity-induced antiferromagnetic phase, inhomogeneous spin-Peierls lattice distortions remain to exist showing a re-entrant behavior. This feature can be drastically altered by very weak perturbations, e.g., the staggered magnetic field or the change in interchain exchange coupling J_\ensuremath⊥, leading to a huge response, which is analogous to the colossal magnetoresistance phenomenon in perovskite manganese oxides.