Details

Autor(en) / Beteiligte

• 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.

Titel

Study of negative thermal expansion in the frustrated spinel ZnCr2Se4

Ist Teil von

• Journal of applied physics, 2014-02, Vol.115 (8)

Ort / Verlag

Melville: American Institute of Physics

Erscheinungsjahr

2014

Link zum Volltext

Quelle

AIP Journals Complete

Beschreibungen/Notizen

• 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.