Enhanced magnetic refrigeration capacity in phase separated manganites

A. L.Lima Sharma; P. A. Sharma; S. K. McCall; S. B. Kim; S. W. Cheong

doi:10.1063/1.3204694

Enhanced magnetic refrigeration capacity in phase separated manganites

A. L.Lima Sharma, P. A. Sharma, S. K. McCall, S. B. Kim, S. W. Cheong

School of Arts and Sciences, New High Energy Theory Center

Research output: Contribution to journal › Article › peer-review

40 Scopus citations

Abstract

Multiple phase transitions and magnetic phase coexistence lead to a negative magnetocaloric effect in a wide temperature range of ∼10-250 K in La_0.215Pr_0.41Ca_0.375 MnO₃. A large fraction of the magnetocaloric effect originates from the low temperature phase separated state, which is composed of coexisting, magnetic field dependent charge ordered, and ferromagnetic regions. While the maximum isothermal entropy change is modest, the persistence of the field-dependent phase separated state over a ∼240 K temperature span yields a refrigeration capacity of ∼3.2 J/cm³. Materials with magnetic field dependent phase separation can therefore be used to improve regenerative magnetic refrigerators.

Original language	English (US)
Article number	092506
Journal	Applied Physics Letters
Volume	95
Issue number	9
DOIs	https://doi.org/10.1063/1.3204694
State	Published - 2009

All Science Journal Classification (ASJC) codes

Physics and Astronomy (miscellaneous)

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10.1063/1.3204694

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title = "Enhanced magnetic refrigeration capacity in phase separated manganites",

abstract = "Multiple phase transitions and magnetic phase coexistence lead to a negative magnetocaloric effect in a wide temperature range of ∼10-250 K in La0.215Pr0.41Ca0.375 MnO3. A large fraction of the magnetocaloric effect originates from the low temperature phase separated state, which is composed of coexisting, magnetic field dependent charge ordered, and ferromagnetic regions. While the maximum isothermal entropy change is modest, the persistence of the field-dependent phase separated state over a ∼240 K temperature span yields a refrigeration capacity of ∼3.2 J/cm3. Materials with magnetic field dependent phase separation can therefore be used to improve regenerative magnetic refrigerators.",

author = "Sharma, {A. L.Lima} and Sharma, {P. A.} and McCall, {S. K.} and Kim, {S. B.} and Cheong, {S. W.}",

note = "Funding Information: The work at Lawrence Livermore National Laboratory was performed under the auspices of the U.S. Department of Energy under Contract No. DE-AC52-07NA27344. The work at Rutgers was supported by the Contract No. DE-FG02-07ER46382. Sandia is a multiprogram laboratory operated by Sandia Corporation, a Lockheed Martin Co., for the U.S. DOE. ",

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AU - McCall, S. K.

AU - Kim, S. B.

AU - Cheong, S. W.

N1 - Funding Information: The work at Lawrence Livermore National Laboratory was performed under the auspices of the U.S. Department of Energy under Contract No. DE-AC52-07NA27344. The work at Rutgers was supported by the Contract No. DE-FG02-07ER46382. Sandia is a multiprogram laboratory operated by Sandia Corporation, a Lockheed Martin Co., for the U.S. DOE.

PY - 2009

Y1 - 2009

N2 - Multiple phase transitions and magnetic phase coexistence lead to a negative magnetocaloric effect in a wide temperature range of ∼10-250 K in La0.215Pr0.41Ca0.375 MnO3. A large fraction of the magnetocaloric effect originates from the low temperature phase separated state, which is composed of coexisting, magnetic field dependent charge ordered, and ferromagnetic regions. While the maximum isothermal entropy change is modest, the persistence of the field-dependent phase separated state over a ∼240 K temperature span yields a refrigeration capacity of ∼3.2 J/cm3. Materials with magnetic field dependent phase separation can therefore be used to improve regenerative magnetic refrigerators.

AB - Multiple phase transitions and magnetic phase coexistence lead to a negative magnetocaloric effect in a wide temperature range of ∼10-250 K in La0.215Pr0.41Ca0.375 MnO3. A large fraction of the magnetocaloric effect originates from the low temperature phase separated state, which is composed of coexisting, magnetic field dependent charge ordered, and ferromagnetic regions. While the maximum isothermal entropy change is modest, the persistence of the field-dependent phase separated state over a ∼240 K temperature span yields a refrigeration capacity of ∼3.2 J/cm3. Materials with magnetic field dependent phase separation can therefore be used to improve regenerative magnetic refrigerators.

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Enhanced magnetic refrigeration capacity in phase separated manganites

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