Enhanced magnetic refrigeration capacity in phase separated manganites

Lima Sharma, A. L.; Sharma, P. A.; McCall, S. K.; Kim, S.-B.; Cheong, S.-W.
August 2009
Applied Physics Letters;8/31/2009, Vol. 95 Issue 9, p092506
Academic Journal
Multiple phase transitions and magnetic phase coexistence lead to a negative magnetocaloric effect in a wide temperature range of ∼10–250 K in La0.215Pr0.41Ca0.375MnO3. 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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