Back to Search
Start Over
Study of negative thermal expansion in the frustrated spinel ZnCr2Se4.
- Source :
-
Journal of Applied Physics . 2014, Vol. 115 Issue 8, p1-5. 5p. 5 Graphs. - Publication Year :
- 2014
-
Abstract
- 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 100K 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. [ABSTRACT FROM AUTHOR]
- Subjects :
- *THERMAL expansion
*SPINEL
*PARAMAGNETISM
*CURIE-Weiss law
*MAGNETOELASTIC effects
Subjects
Details
- Language :
- English
- ISSN :
- 00218979
- Volume :
- 115
- Issue :
- 8
- Database :
- Academic Search Index
- Journal :
- Journal of Applied Physics
- Publication Type :
- Academic Journal
- Accession number :
- 95694469
- Full Text :
- https://doi.org/10.1063/1.4867217