期刊
PHYSICAL REVIEW B
卷 81, 期 22, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.81.224424
关键词
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资金
- DECRYPT
- CAMRADS
- Banco Santander
- Spanish MICINN
- EU FEDER [MAT 2007-65227]
- PAI of Regional Government of Andalucia [P06-FQM-01823]
- [MAT08-01077]
A universal curve for the change in the magnetic entropy has been recently proposed for materials with second-order phase transitions. In this work we have studied the universal behavior of the magnetocaloric effect in the family of cobalt Laves phases, RCo2, and mixed manganites, La-2/3(CaxSr(1-x))(1/3)MnO3, which exhibit first- and second-order phase transitions. The rescaled magnetic entropy change curves for different applied fields collapse onto a single curve for materials with second-order phase transition as opposed to the first- order phase transition compounds, for which this collapse does not hold. This result suggests that the universal curve may be used as a further criterion to distinguish the order of the phase transition.
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