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Magnetocaloric effect in La1.2R0.2Ca1.6Mn2O7 compounds

A. VLADESCU1, S. MICAN1, C. HIMCINSCHI2, R.TETEAN1,*

Affiliation

  1. Faculty of Physics, Babes-Bolyai University RO-400084 Cluj-Napoca, Romania
  2. Technical University Chemnitz, Institute of Physics, Reichenhainerstr 70, D-09107 Chemnitz, Germany

Abstract

Magnetocaloric effect of double layered manganites, La1.4-XRXCa1.6Mn2O7 compounds where R = Nd, Sm, Ho or Yb were analysed. Polycrystalline samples were prepared by solid state reaction. Magnetic measurements were performed in magnetic fields up to 12 T and the temperature range 4.2-700 K. The Curie temperatures decrease with substitution. Above the Curie temperatures a small anomaly in the temperature dependences of the magnetization, around 250K was found. This phenomenon was explained by the presence of two dimensional short range magnetic order. The adiabatic magnetic entropy changes, ∆S , were determined from magnetization data. Large MCE has been obtained in all samples. The potential use of these materials in magnetic refrigeration is discussed..

Keywords

Manganites, Magnetocaloric effect; Magnetization.

Submitted at: March 1, 2011
Accepted at: March 16, 2011

Citation

A. VLADESCU, S. MICAN, C. HIMCINSCHI, R.TETEAN, Magnetocaloric effect in La1.2R0.2Ca1.6Mn2O7 compounds, Journal of Optoelectronics and Advanced Materials Vol. 13, Iss. 3, pp. 263-267 (2011)