abstract
We report here an investigation on the structural, magnetic and magnetocaloric properties of Mn doped EuCr0.85Mn0.15O3 (ECMO) chromites synthesized via ceramic route. The compound crystallized into distorted orthorhombic structure with Pnma space group similar to that of its parent EuCrO3 compound, as revealed from the refined of x-ray powder diffraction pattern, but with an increase in the lattice volume. Neel temperature, noticed at 162 K from the temperature variation of magnetization, smaller than that reported for pristine EuCrO3; indicated the influence of Mn3+ substitution in decreasing the antiferromagnetic ordering. Magnetization reversal evolved in the studied compound under lower field while such feature was absent in the undoped EuCrO3. Magnetocaloric effect was measured through the magnetic entropy change and relative cooling power. Near the spin reorientation transition temperature similar to 40 K, the magnetic entropy change was equal to 3.788 J kg(-1) K-1 under 90 kOe field with 215.22 J kg(-1)relative cooling power. The results have been understood in terms of the competition between Cr-rich clusters, Mn-rich clusters and local Mn-Cr ordered clusters and their different temperature dependency.
keywords
WEAK-FERROMAGNETISM; SUPEREXCHANGE INTERACTION; EXCHANGE BIAS; TEMPERATURE; PEROVSKITES; TRANSITIONS; CHEMISTRY; CHROMITES; SYSTEM
subject category
Physics
authors
Kumar, S; Coondoo, I; Vasundhara, M; Puli, VS; Panwar, N
our authors
Indrani Coondoo
Junior Researcheracknowledgements
The author S. K. would like to thank University Grant Commission, New Delhi for providing Rajiv Gandhi National Fellowship (RGNF) whereas I. C. acknowledges the financial support from FCT, Portugal through SFRH/BPD/81032/2011. The authors would also like to thank Council of Scientific and Industrial Research networking projects SURE-CSC0132 and INTELCOAT-CSC0114 for partially supporting this work.