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; C. T. Au; Y. W. Du

doi:10.1140/epjb/e2002-00386-3

Preparation, magnetoresistance and magnetocaloric effect of two-layered perovskite La_2.5-xK_0.5+xMn₂O_7+δ

W. Zhong^*, W. Chen, H. Y. Jiang, X. S. Liu, C. T. Au, Y. W. Du

^*Corresponding author for this work

Department of Chemistry

Research output: Contribution to journal › Journal article › peer-review

13 Citations (Scopus)

Abstract

Polycrystalline two-layered perovskite La_2.5-xK_0.5+xMn₂O_7+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 (T_ρ) and the magnetic transition temperature (T_C) 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 (T_C), far above its MI transition temperature (T_ρ). The large magnetic entropy change (∼1.4 J/kg.K) is obtained in the sample La_2.5-xK_0.5+xMn₂O_7+δ (x = 0.35) upon 10 kOe applied magnetic field.

Original language	English
Pages (from-to)	331-337
Number of pages	7
Journal	European Physical Journal B
Volume	30
Issue number	3
DOIs	https://doi.org/10.1140/epjb/e2002-00386-3
Publication status	Published - 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

Access to Document

10.1140/epjb/e2002-00386-3

Cite this

@article{147b005bd12a41ab9c090adcd7795201,

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

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.",

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",

author = "W. Zhong and W. Chen and Jiang, {H. Y.} and Liu, {X. S.} and Au, {C. T.} and Du, {Y. W.}",

year = "2002",

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T1 - Preparation, magnetoresistance and magnetocaloric effect of two-layered perovskite La2.5-xK0.5+xMn2O7+δ

AU - Zhong, W.

AU - Chen, W.

AU - Jiang, H. Y.

AU - Liu, X. S.

AU - Au, C. T.

AU - Du, Y. W.

PY - 2002/12/1

Y1 - 2002/12/1

N2 - 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.

AB - 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.

KW - 75.30.Sg Magnetocaloric effect, magnetic cooling

KW - 81.05.Mh Cermets, ceramic and refractory composites

KW - 82.80.-d Chemical analysis and related physical methods of analysis

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DO - 10.1140/epjb/e2002-00386-3

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AN - SCOPUS:0041401343

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EP - 337

JO - European Physical Journal B

JF - European Physical Journal B

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