Prof. Bimal Kumar Sarkar
Galgotias University, India
Magneto-caloric effect in RE4TX

The ternary rare earth (RE)-rich intermetallic compounds of the general composition RE4TX (T is late transition metal and X is Mg, Cd or In), that crystallize in prototype Gd4RhIn cubic type structure have been paid much attention due to their fascinating physical and chemical properties. The reversible transformation from paramagnetic to ferromagnetic state with a second order magnetic phase transition lead to many interesting properties like large magneto-caloric effect (MCE), giant magnetoresistance, and magnetic field induced strain. The maximum values of these properties are usually obtained around Curie temperature (TC). This is mostly adjusted by changing composition and to a lesser extent by employing different heat treatment procedures and different preparation techniques. The change in composition also affects functional capability of these compounds, which can further be adjusted to give maximum possible output for a given composition with a proper magnetic field. Recent studies of large reversible magneto-caloric effect around TC show that the changes brought about in bulk occur because of the change in atomic ordering. In our investigation we have quantified MCE (measured indirectly) in terms of magnetic entropy change DS, which was evaluated using modified Maxwell relation.


Bimal Kumar Sarkar, born January 2, 1961, in Kolkata, India, graduated in physics at Jadavpur University and electrical engineering at Institute of Engineers (India). He did his Ph.D. on the topic Photoacoustic Spectroscopic Estimation of Thermal and Optical Properties of Solids at Indian Association for the Cultivation of Science, India. He pursued a postdoctoral fellowship at the Department of Chemistry, National Sun Yat-sen University,Taiwan. Afterward he visited in research positions at NSYSU, Taiwan, Czech Technical University, Slovak Technical University etc. Now he is a Professor in Physics at Galgotias University, India with activity in research and teaching. At present, he is involved in the field of Computational Materials and Computational Biology. His research interest is ab initio study of the structural, lattice dynamics, electronic, elastic, thermodynamic, optical properties of solids. First-principles calculations based on density functional theory (DFT) are performed to study the structural and electronic properties of solids. Also he is doing work on the application of photoacoustic spectroscopy in different properties of solids. In March 2014 he had 85 articles published in international peer reviewed journals and conference proceedings.

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