Physics – Condensed Matter – Materials Science
Scientific paper
2010-12-13
J. Phys. Cond. Matter 23 (2011) 052201
Physics
Condensed Matter
Materials Science
14^pages, 3 figures, Submitted to J. Phys. Cond. Mat
Scientific paper
10.1088/0953-8984/23/5/052201
Magnetic properties of a series of (La0.7Sr0.3MnO3/SrRuO3) superlattices, where the SrRuO3 layer thickness is varying, are examined. A room-temperature magnetocaloric effect is obtained owing to the finite size effect which reduces the TC of La0.7Sr0.3MnO3 layers. While the working temperature ranges are enlarged,, -DeltaSmax values remains similar to the values in polycrystalline La0.7Sr0.3MnO3. Consequently, the relative cooling powers are significantly improved, the microscopic mechanism of which is related to the effect of the interfaces at La0.7Sr0.3MnO3/SrRuO3 and higher nanostructural disorder. This study indicates that artificial oxide superlattices/multilayers might provide an alternative pathway in searching for efficient room-temperature magnetic refrigerators for (nano)microscale systems.
Guillou F.
Hardy Vincent
Padhan Prahallad
Prellier Wilfrid
Thota S.
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