Negative exchange interactions and Curie temperatures for Sm2Fe17 and Sm2Fe17Ny
Creators
- 1. Department of Physics, University of Manitoba, Winnipeg, R3T 2N2 (CANADA)
Description
Moessbauer spectra of Sm2Fe17 and Sm2Fe17Ny in a temperature range between 77 K and the Curie temperature have been studied. The exchange integrals, as a function of the distances between the Fe-Fe pairs, have been found by fitting the hyperfine field data at various temperatures for each Fe site. The results show that there exist both positive and negative exchange interactions for Sm2Fe17 and Sm2Fe17Ny. The magnitude of the negative interaction leads to a significant difference in the Curie temperature for the two materials. Based on a model that considers the competition between the positive and negative exchange interactions, the Curie temperatures of some 2:17-type compounds have been calculated; the results agree well with the experimental values. copyright 1997 The American Physical Society
Additional details
Publishing Information
- Journal Title
- Physical Review. B, Condensed Matter
- Journal Volume
- 55
- Journal Issue
- 6
- Journal Page Range
- p. 3670-3676.
- ISSN
- 0163-1829
- CODEN
- PRBMDO
INIS
- Country of Publication
- United States
- Country of Input or Organization
- United States
- INIS RN
- 28040324
- Subject category
- S75: CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY;
- Descriptors DEI
- CRYSTAL DEFECTS; CURIE POINT; EXCHANGE INTERACTIONS; HYPERFINE STRUCTURE; IRON BASE ALLOYS; MOESSBAUER EFFECT; SAMARIUM ALLOYS; TEMPERATURE DEPENDENCE; TEMPERATURE RANGE 0065-0273 K
- Descriptors DEC
- ALLOYS; CRYSTAL STRUCTURE; INTERACTIONS; IRON ALLOYS; PHYSICAL PROPERTIES; RARE EARTH ALLOYS; TEMPERATURE RANGE; THERMODYNAMIC PROPERTIES; TRANSITION ELEMENT ALLOYS; TRANSITION TEMPERATURE