Study of negative thermal expansion in the frustrated spinel ZnCr2Se4

Autor:	Chen, X. L., Yang, Z. R., Tong, W., Huang, Z. H., Zhang, L., Zhang, S. L., Song, W. H., Pi, L., Sun, Y. P., Tian, M. L., Zhang, Y. H.
Rok vydání:	2014
Předmět:	Condensed Matter - Strongly Correlated Electrons Condensed Matter - Materials Science
Zdroj:	Journal of Applied Physics 115, 083916 (2014)
Druh dokumentu:	Working Paper
DOI:	10.1063/1.4867217
Popis:	The origin of negative thermal expansion (NTE) in the bond frustrated ZnCr2Se4 has been explored. ESR and FTIR document an ideal paramagnetic state above 100 K, below which ferromagnetic clusters coexist with the paramagnetic state down to TN. By fitting the inverse susceptibility above 100 K using a modified paramagnetic Curie-Weiss law, an exponentially changeable exchange integral J is deduced. In the case of the variable J, magnetic exchange and lattice elastic energy couple with each other effectively via magnetoelastic interaction in the ferromagnetic clusters, where NTE occurs at a loss of exchange energy while a gain of lattice elastic one. Comment: 5 pages, 5 figures
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/1401.4246 Zobrazit plný text záznamu View this record from Arxiv