Heat capacity and magnetoresistance in Dy(Co,Si)2 compounds

Niraj K. Singh, K. G. Suresh, A. K. Nigam, S. K. Malik

doi:10.1063/1.1844932

Heat capacity and magnetoresistance in Dy(Co,Si)2 compounds

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Niraj K. Singh

Department of Physics, Indian Institute of Technology , Bombay, Mumbai-400 076, India
K. G. Suresh

Department of Physics, Indian Institute of Technology , Bombay, Mumbai-400 076, India
A. K. Nigam

Tara Institute of Fundamental Research , Homi Bhabha Road, Mumbai-400 005, India
S. K. Malik

Tara Institute of Fundamental Research , Homi Bhabha Road, Mumbai-400 005, India

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<jats:p>Magnetocaloric effect and magnetoresistance have been studied in Dy(Co1−x,Six)2 (x=0, 0.075, and 0.15) compounds. Magnetocaloric effect has been calculated in terms of adiabatic temperature change (ΔTad) as well as isothermal magnetic entropy change (ΔSM) using the heat-capacity data. The maximum values of ΔSM and ΔTad for DyCo2 are found to be 11.4JKg−1K−1 and 5.4 K, respectively. Both ΔSM and ΔTad decrease with Si concentration, reaching values of 5.4JKg−1K−1 and 3 K, respectively for x=0.15. The maximum magnetoresistance is found to be about 32% in DyCo2, which decreases with increase in Si. These variations are explained on the basis of itinerant electron metamagnetism occurring in these compounds.</jats:p>