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Magnetic properties and magnetocaloric effect in La1.4-XRXCa1.6Mn2O7 compounds with R=Ho or Yb

R. TETEAN1,* , C. HIMCINSCHI2, E. BURZO1

Affiliation

  1. Faculty of Physics, Babes-Bolyai University 400084 Cluj-Napoca, Romania
  2. Institut für Physik, Halbleiterphysik, Technische Universität Chemnitz, Reichenhainerstr 70, D-09107 Chemnitz, Germany

Abstract

Magnetic properties and magnetocaloric effect (MCE) of double layered manganites, La1.4-XRXCa1.6Mn2O7, where R = Ho or Yb and x=0 or 0.2 were analysed. Polycrystalline samples were prepared by solid state reaction. Magnetic measurements were performed in magnetic fields up to 5 T in the temperature range 4.2-300 K. The Curie temperatures decrease from 246 K (x=0) to 211 K (x=0.2) for R=Yb and 221 K (x=0.2) for R=Ho. Above the Curie temperatures small anomalies in the temperature dependences of the magnetizations were found. These were explained by the presence of two dimensional short range magnetic order. The adiabatic magnetic entropy changes, ΔS , were determined from magnetization data. Large MCE has been shown in all samples. The potential use of these materials for magnetic refrigeration is discussed..

Keywords

Manganites, Magnetocaloric effect, Magnetization.

Submitted at: Feb. 25, 2008
Accepted at: April 4, 2008

Citation

R. TETEAN, C. HIMCINSCHI, E. BURZO, Magnetic properties and magnetocaloric effect in La1.4-XRXCa1.6Mn2O7 compounds with R=Ho or Yb, Journal of Optoelectronics and Advanced Materials Vol. 10, Iss. 4, pp. 849-852 (2008)