Preparation, magnetoresistance and magnetocaloric effect of two-layered perovskite La2.5-xK0.5+xMn2O7+δ

W. Zhong*, W. Chen, H. Y. Jiang, X. S. Liu, Chak Tong AU, Y. W. Du

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)

Abstract

Polycrystalline two-layered perovskite La2.5-xK0.5+xMn2O7+δ (0 < x < 0.5) samples have been prepared by a modified sol-gel method and their magnetoresistance and magnetocaloric effects have been studied. A large deviation between the metal-insulator (MI) transition temperature (Tρ) and the magnetic transition temperature (TC) is observed. Large magnetoresistance (MR) effects with Δρ/ρ0 of ∼40% at 12 kOe are obtained in wide temperature ranges. The maximum of the magnetic entropy change peaks at its Curie temperature (TC), far above its MI transition temperature (Tρ). The large magnetic entropy change (∼1.4 J/kg.K) is obtained in the sample La2.5-xK0.5+xMn2O7+δ (x = 0.35) upon 10 kOe applied magnetic field.

Original languageEnglish
Pages (from-to)331-337
Number of pages7
JournalEuropean Physical Journal B
Volume30
Issue number3
DOIs
Publication statusPublished - 1 Dec 2002

Scopus Subject Areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

User-Defined Keywords

  • 75.30.Sg Magnetocaloric effect, magnetic cooling
  • 81.05.Mh Cermets, ceramic and refractory composites
  • 82.80.-d Chemical analysis and related physical methods of analysis

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