Magnetic properties of the Haldane-gap material NENB - Condensed Matter > Other Condensed MatterReportar como inadecuado




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Abstract: Results of magnetization and high-field ESR studies of the new spin-1Haldane-chain material NiC2H8N22NO2BF4 NENB are reported. A definitesignature of the Haldane state in NENB was obtained. From the analysis of thefrequency-field dependence of magnetic excitations in NENB, thespin-Hamiltonian parameters were calculated, yielding Delta = 17.4 K,g parallel = 2.14, D = 7.5 K, and |E| = 0.7 K for the Haldane gap, g factor andthe crystal-field anisotropy constants, respectively. The presence offractional S = 1-2 chain-end states, revealed by ESR and magnetizationmeasurements, is found to be responsible for spin-glass freezing effects. Inaddition, extra states in the excitation spectrum of NENB have been observed inthe vicinity of the Haldane gap, which origin is discussed.



Autor: E. Cizmar, M. Ozerov, O. Ignatchik, T. P. Papageorgiou, J. Wosnitza, S. A. Zvyagin, J. Krzystek, Z. Zhou, C. P. Landee, B. R. Lan

Fuente: https://arxiv.org/







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