Observation of spin freezing and relaxation at microwave frequencies in the spin ladder compound Sr_14-xCa_xCu₂₄O₄₁

1999/03/12 by Z. Zhai, Zhangyin Zhai, P. V. Patanjali +17
Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #FOS: Physical sciences #Magnetic and transport properties of perovskites and related materials #Physics of Superconductivity and Magnetism #Strongly Correlated Electrons (cond-mat.str-el) #cond-mat.str-el

paper · pdf · doi:10.48550/arxiv.cond-mat/9903198

4 pages, 5 figures included in ps format

arxiv created 1999/03/12 · openalex publication_date 1999/03/12 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

We report the observation of a frequency (ω) and temperature (T) -dependent loss peak in χ'' and accompanying dispersion in χ' from microwave (2-18GHz) measurements of the complex susceptibility χ(ω, T)=χ'+iχ'' of Sr_14-xCa_xCu₂₄O₄₁. We associate this phenomenon with a rapid decrease of spin disorder and corresponding spin relaxation rate, representing a ``spin freezing transition'' accompanying charge ordering which occurs at temperatures ∼ 250K. Our results enable direct quantitative measurements of the spin relaxation rate, and yield information on spin dynamics in these materials and the related compounds SrCuO₂ and Sr₂CuO₃.

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