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Room‐temperature magnetic entropy change in La 0.7 Sr 0.3 Mn 1‐x M x O 3 (M = Al, Ti)
Author(s) -
Dai N. V.,
Son D. V.,
Yu S. C.,
Bau L. V.,
Hong L. V.,
Phuc N. X.,
Nam D. N. H.
Publication year - 2007
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.200777362
Subject(s) - magnetic refrigeration , curie temperature , magnetization , materials science , condensed matter physics , thermodynamics , analytical chemistry (journal) , chemistry , magnetic field , ferromagnetism , physics , chromatography , quantum mechanics
Abstract Magnetic entropy change in and above the room‐temperature region has been measured for La 0.7 Sr 0.3 Mn 1‐ x M x O 3 ( M = Al, Ti) by means of magnetization measurements in magnetic fields up to 6 T. The magnetocaloric effect (MCE) becomes strongest at the Curie temperature T c that is tuned to ∼300 K by the substitution of Al or Ti for Mn. While the substitution of Al for Mn drastically reduces the entropy change, it extends considerably the working temperature span and improves the relative cooling power (RCP). The MCE and RCP seem to be only lightly affected by Ti substitution. Although manganites are considered potential for magnetic refrigerants, the limitations for achieving strong MCE in the materials are also discussed. (© 2007 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)