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Pressure-induced colossal magnetocaloric effect in MnAs.
MedLine Citation:
PMID:  15601196     Owner:  NLM     Status:  PubMed-not-MEDLINE    
Abstract/OtherAbstract:
To present day, the maximum magnetocaloric effect (MCE) at room temperature for a magnetic field change of 5 T is 40 J/(kg K) for MnAs. In this Letter we present colossal MCE measurements on MnAs under pressure, reaching values up to 267 J/(kg K), far greater than the magnetic limit arising from the assumption of magnetic field independence of the lattice and electronic entropy contributions. The origin of the effect is the contribution to the entropy variation coming from the lattice through the magnetoelastic coupling.
Authors:
Sergio Gama; Adelino A Coelho; Ariana de Campos; A Magnus G Carvalho; Flávio C G Gandra; Pedro J von Ranke; Nilson A de Oliveira
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Publication Detail:
Type:  Journal Article     Date:  2004-11-30
Journal Detail:
Title:  Physical review letters     Volume:  93     ISSN:  0031-9007     ISO Abbreviation:  Phys. Rev. Lett.     Publication Date:  2004 Dec 
Date Detail:
Created Date:  2004-12-16     Completed Date:  2005-05-19     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0401141     Medline TA:  Phys Rev Lett     Country:  United States    
Other Details:
Languages:  eng     Pagination:  237202     Citation Subset:  -    
Affiliation:
Instituto de Física Gleb Wataghin, Universidade Estadual de Campinas-UNICAMP, Caixa Postal 6165, 13083-970 Campinas, São Paulo, Brazil.
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