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Magnetocaloric effect in orthorhombic manganese compounds

D. DIMITROV1, A. APOSTOLOV2, I. RADULOV1, V. LOVCHINOV1,*

Affiliation

  1. "George Nadjakov" Institute of Solid State Physics, Bulgarian Academy of Sciences, 72 Tzarigradsko Chaussee Blvd., 1784 Sofia, Bulgaria
  2. University of Sofia, Faculty of Physics, 5 J.Bourchier Blvd.,1164 Sofia, Bulgaria

Abstract

Two type monocrystals of TbMn2O5 and HoMn2O5 manganites were investigated from 4.2 to 180 K. The crystals have orthorhombic structure and display antiferromagnetic transition in the investigated interval. Curie-Weiss law calculations show different type ordering along the crystallographic directions. Magnetocaloric effect computations carried out with the help of cp investigations display three times higher values of the adiabatic temperature change for the TbMn2O5 compound. This result is attributed to the features of the rare-earth elements which present the same behaviour in pure mode at higher temperatures..

Keywords

Manganites, Magnetocaloric effect, Specific heat, Adiabatic temperature change, Magnetic entropy.

Submitted at: Nov. 19, 2007
Accepted at: Jan. 18, 2008

Citation

D. DIMITROV, A. APOSTOLOV, I. RADULOV, V. LOVCHINOV, Magnetocaloric effect in orthorhombic manganese compounds, Journal of Optoelectronics and Advanced Materials Vol. 10, Iss. 1, pp. 205-208 (2008)