2005/06/30 by C. Hess, C. Heß, Patrick Ribeiro +7 · 2 citations
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.other #cond-mat.str-el
paper · pdf · doi:10.1103/physrevb.73.104407
published as Phys. Rev. B 73, 104407 (2006)
openalex publication_date 2006/03/09 · arxiv created 2006/03/17 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
The magnon thermal conductivity \ensuremathκmag of the spin ladders in Sr14Cu_24\ensuremath-xZnxO41 has been investigated at low doping levels x=0, 0.125, 0.25, 0.5, and 0.75. The Zn-impurities generate nonmagnetic defects which define an upper limit for lmag and, therefore, allow a clear-cut relation between lmag and \ensuremathκmag to be established independently of any model. Over a large temperature range we observe a progressive suppression of \ensuremathκmag with increasing Zn-content and find in particular that with respect to pure Sr14Cu24O41 \ensuremathκmag is strongly suppressed even in the case of tiny impurity densities where lmag\ensuremath\lesssim374\phantom\rule0.3em0ex\mathrm\AA. This shows unambiguously that large lmag\ensuremath≈3000\phantom\rule0.3em0ex\mathrm\AA which have been reported for Sr14Cu24O41 and La5Ca9Cu24O41 on basis of a kinetic model are in the correct order of magnitude.