Hydrostatic Pressure-Induced Modifications of Structural Transitions Lead to Large Enhancements of Magnetocaloric Effects in MnNiSi-Based Systems

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Hydrostatic Pressure-Induced Modifications of Structural Transitions Lead to Large Enhancements of Magnetocaloric Effects in MnNiSi-Based Systems

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Title: Hydrostatic Pressure-Induced Modifications of Structural Transitions Lead to Large Enhancements of Magnetocaloric Effects in MnNiSi-Based Systems
Author(s):
Samanta, Tapas;
Lepkowski, Daniel L.;
Saleheen, Ahmad Us;
Shankar, Alok;
Prestigiacomo, Joseph;
Dubenko, Igor;
Quetz, Abdiel;
Oswald, Iain W. H.;
McCandless, Gregory T.;
Chan, Julia Y.;
Adams, Philip W.;
Young, David P.;
Ali, Naushad;
Stadler, Shane
Item Type: Article
Keywords: Martensitic transformations
Pressure
Magnetostructural transition (MST)
Entropy
Abstract: A remarkable decrease of the structural transition temperature of MnNiSi from 1200 to < 300 K by chemically alloying it with MnFeGe results in a coupling of the magnetic and structural transitions, leading to a large magnetocaloric effect near room temperature. Application of relatively low hydrostatic pressures (similar to 2.4 kbar) lead to an extraordinary enhancement of the isothermal entropy change from -Delta S = 44 to 89 J/kgK at ambient and 2.4 kbar applied pressures, respectively, for a field change of Delta B = 5 T, and is associated with a large relative volume change of about 7% with P = 2.4 kbar.
Publisher: Amer Physical Soc
ISSN: 1098-0121
Persistent Link: http://hdl.handle.net/10735.1/4391
http://dx.doi.org/10.1103/PhysRevB.91.020401
Terms of Use: ©2015 American Physical Society
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