Journal
APPLIED PHYSICS LETTERS
Volume 112, Issue 2, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.5011743
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Funding
- U.S. Department of Energy (DOE), Office of Science, Basic Energy Sciences (BES) [DE-FG02-13ER46946]
- DOE, Office of Science, BES [DE-FG02-07ER46420, DE-FG02-06ER46291]
- CICYT (Spain) [FIS2014-54734-P]
- Catalan Government [2014SGR-00581]
- NSF through DMR Grant [1306392]
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(MnNiSi)(1-x)(FeCoGe)(x) undergoes a magnetostructural phase transition near room temperature that is acutely sensitive to applied hydrostatic pressure, which presents as a marked shift in the martensitic transition temperature (T-M) by about -7.5 K/kbar. The magnetostructural transition can therefore be induced by applied hydrostatic pressure or by magnetic field. The barocaloric and magnetocaloric effects were measured across TM (for the sample with x = 0.38), and the corresponding entropy changes were +74 J/kgK (P = 2.7 kbar) and -58 J/kgK (mu H-0 = 5 T), respectively. It was observed that the transition entropy change increases with pressure, which results in an enhancement of the barocaloric effect. Our measurements show that the transformed phase fraction associated with magnetostructural transition does not depend on pressure and, therefore, this enhancement cannot be attributed to a pressure-assisted completion of the phase transformation. Published by AIP Publishing.
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