Eur. Phys. J. B (2013) 86: 378
https://doi.org/10.1140/epjb/e2013-40489-0

Regular Article

Large magnetoresistance associated with large inverse magnetocaloric effect in Ni-Co-Mn-Sn alloys

Magnetism Laboratory, Department of Condensed Matter Physics and Material Sciences, S.N. Bose National Centre for Basic Sciences, Block-JD, Sector-III, Salt Lake, Kolkata 700098, India

^a e-mail: arup.1729@gmail.com

Received: 14 May 2013
Received in final form: 2 July 2013
Published online: 11 September 2013

Abstract

Structural and magnetic transitions of Ni_47.5-xCo_xMn_37.5Sn₁₅ (x = 0, 1, 2 and 3.5) alloys were confirmed and studied by magnetic and resistivity measurements. Though a large magnetic entropy change (ΔS_M) ~ 9.5 J/kg K was obtained for x = 3.5 due to a change of only 1.5 T magnetic field, hysteresis losses limited its refrigerant capacity to a significant extent. A maximum –69% magnetoresistance was obtained due to a structural transition in the same sample in presence of 8 T field. It was found that the same material can be used for practical applications within a wide range of temperature as it shows large magnetoresistance at remote temperatures far below from its structural transition point.