ESR study of (Sr,La,Ca)_{14}Cu_{24}O_{41}

A. Freimuth; A. Revcolevschi; B. Buechner; K.-Y. Choi; M. Grueninger; U. Ammerahl; V. Kataev

arxiv: cond-mat/0108512 · v1 · submitted 2001-08-30 · ❄️ cond-mat.str-el

ESR study of (Sr,La,Ca)₁₄Cu₂₄O₄₁

V. Kataev , K.-Y. Choi , M. Grueninger , U. Ammerahl , B. Buechner , A. Freimuth , A. Revcolevschi This is my paper

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keywords chainsspinholeamountanisotropybroadcompoundcontent

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We report an electron spin resonance (ESR) study of single crystals of the spin-chain spin-ladder compound (Sr,La,Ca)_{14}Cu_{24}O_{41}. The data suggest that in intrinsically hole doped Sr_{14-x}Ca_xCu_{24}O_{41} only a small amount of holes is transferred from the chains to the ladders with increasing x, resulting in a crossover from spin dimerized to uniform spin chains. In the samples of La_{14-x}Ca_xCu_{24}O_{41} with reduced hole content a very broad signal is observed in the paramagnetic state, indicative of a surprisingly strong anisotropy of the nearest neighbor exchange in the chains.

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ESR study of (Sr,La,Ca)₁₄Cu₂₄O₄₁

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