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Pressure enhancement of the giant magnetocaloric effect in Tb5Si2Ge2.
- Source :
-
Physical review letters [Phys Rev Lett] 2004 Sep 24; Vol. 93 (13), pp. 137201. Date of Electronic Publication: 2004 Sep 20. - Publication Year :
- 2004
-
Abstract
- Effects of temperature and pressure on magnetic, elastic, structural, and thermal properties of Tb5Si2Ge2 have been studied by means of macroscopic (thermal expansion and magnetization) and microscopic (neutron powder diffraction) techniques. We present evidence that the high-temperature second-order ferromagnetic transition can be coupled with the low-temperature first-order structural phase change into a single first-order magnetic-crystallographic transformation at and above a tricritical point in the vicinity of 8.6 kbar. This pressure-induced coupling has a remarkable effect on the magnetocaloric effect, transforming Tb5Si2Ge2 from an ordinary into a giant magnetocaloric effect material.
Details
- Language :
- English
- ISSN :
- 0031-9007
- Volume :
- 93
- Issue :
- 13
- Database :
- MEDLINE
- Journal :
- Physical review letters
- Publication Type :
- Academic Journal
- Accession number :
- 15524753
- Full Text :
- https://doi.org/10.1103/PhysRevLett.93.137201