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Magnetic entropy change of the layered perovskites La2–2xSr1+2xMn2O7

J. Appl. Phys. 97, 103906 (2005); doi:10.1063/1.1888045

Published 3 May 2005

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Aihua Wang
School of Materials Science and Engineering, University of Science and Technology of Beijing, Beijing 100083, China and Department of Physics, Capital Normal University, Beijing 100037, China

Guohui Cao, Yang Liu, and Yi Long
School of Materials Science and Engineering, University of Science and Technology of Beijing, Beijing 100083, China

Yang Li
Department of Physics, University of Science and Technology of Beijing, Beijing 100083, China and Department of Physics, Texas Agricultural and Mechanical (A&M) University, College Station, Texas 77843-4242

Zhaosheng Feng
Department of Mathematics, University of Texas–Pan American, Edinburg, Texas 78541

Joseph H. Ross, Jr.
Department of Physics, Texas Agricultural and Mechanical (A&M) University, College Station, Texas 77843-4242
Magnetocaloric properties of perovskite-type manganese oxides with double Mn-O layers of composition La2–2xSr1+2xMn2O7 (x=0.33 and 0.4) have been investigated. A broad peak of magnetic entropy change (–DeltaSM) was observed at the Curie temperature. The shape of –DeltaSM is strongly dependent on the Sr concentration. In contrast to Ln1–xAxMnO3 perovskites, the distinct curvilinear shape of –DeltaSM for perovskites with double Mn-O layers shows different magnetic mechanisms arising from magnetocrystalline anisotropy. ©2005 American Institute of Physics
History: Received 21 September 2004; accepted 18 February 2005; published 3 May 2005
Permalink: http://link.aip.org/link/?JAPIAU/97/103906/1
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KEYWORDS and PACS

Keywords
PACS
  • 75.50.Dd
    Nonmetallic ferromagnetic materials
  • 75.30.Sg
    Magnetocaloric effect, magnetic cooling (magnetically ordered materials)
  • 75.30.Kz
    Magnetic phase boundaries including magnetic transitions, metamagnetism, etc
  • 75.30.Gw
    Magnetic anisotropy
  • 75.40.Cx
    Static properties of magnetic materials including order parameter, static susceptibility, heat capacities, critical exponents, etc
  • 65.40.Gr
    Entropy and other thermodynamical quantities of crystalline solids
  • YEAR: 2005

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ISSN:
0021-8979 (print)   1089-7550 (online)
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