Enhanced magnetocaloric effect in quasi-one-dimensional S = 1/2 Heisenberg antiferromagnet [Cu(dmen)₂(H₂O)]SiF₆

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• 作者：M. Orend谩膷 ; E. 膶i啪m谩r ; A. Orend谩膷ov谩 ; J. Tk谩膷ov谩 ; J. Kuch谩r ; J. 膶ern谩k
• 关键词：Enhanced magnetocaloric effect ; Quantum spin chain ; Magnetostructural correlations
• 刊名：Journal of Alloys and Compounds
• 出版年：15 February, 2014
• 年：2014
• 卷：586
• 期：Complete
• 页码：34-38
• 全文大小：696 K

文摘

The results of specific heat and electron-spin resonance of [Cu(dmen)₂(H₂O)]SiF₆ (dmen = N,N-dimethyl-1,2-diaminoethane) are reported. The studied material can be considered as an S = 1/2 quasi-one-dimensional Heisenberg antiferromagnet with dominant intrachain interaction J_intra/k_B = 鈭?.59 K. The appearance of both normal and inverse magnetocaloric effect in various field ranges below saturation field B_sat is tentatively attributed to weaker ferromagnetic interchain interactions. Pronounced magnetocaloric effect is found in the vicinity of B_sat, where at temperatures T 鈮?#xA0;|J_intra/k_B|, the isothermal change of entropy was found to be about 20 times higher than that in S = 1/2 paramagnet. The potential origin of the observed behavior is discussed.