Interaction of triplet excitations with spin chain ends in the Haldane magnet PbNi2V2O8

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS

卷:272

Article; Proceedings Paper

Smirnov, AI ; von Nidda, HAK ; Loidl, A ; Demianets, LN ; Shapiro, AY

关键词: low dimensional magnets;    Haldane gap;    spin chains;   

DOI  :  10.1016/j.jmmm.2003.12.1144

来源: Elsevier

【 摘 要 】

ESR signals of two kinds were detected in the doped Haldane magnet Pb(Ni1-xMgx)(2)V2O8. The low-temperature ESR with the value of g-factor 2.2 corresponds to effective spins S =1/2, at the ends of the spin chains. The signal of the second type is thermally activated, has a spectrum with the zero-field frequency 86 GHz and is described by an effective spin S = 1 in an axial crystal field. The last signal is due to the splitting of the spin sublevels of the triplet excitations in a magnetic and crystal fields. An exchange coupled ESR mode of triplets and spin-chain ends is found at intermediate temperatures. (C) 2003 Elsevier B.V. All rights reserved.

【 授权许可】

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