Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2001-06-05
Physics
Condensed Matter
Strongly Correlated Electrons
9 pages, 9 figures, to be published in JETP v.120, July 2001
Scientific paper
10.1134/1.1391531
The magnetic resonance spectrum of spin clusters formed in spin-Peierls magnets in the vicinity of impurity ions was investigated. The observed temperature dependences of the effective g-factor and the linewidth of the electron spin resonance (ESR) in crystals of Cu(1-x)Ni(x)GeO(3) are described in the model of the exchange narrowing of the two-component spectrum with one component ascribed to spin clusters and exhibiting an anomalous value of the $g$-factor and the other related to triplet excitations. An estimation of the size of the suppressed dimerization region around the impurity ion is obtained (this region includes about 30 copper ions). The dependence of the effective g-factor and the ESR linewidth on the impurity concentration at low temperatures indicates the interaction of clusters.
Dhalenne Guy
Eremina R. M.
Glazkov Vasiliy N.
Revcolevschi Alexandre
Smirnov Aleksei Iu.
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