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Magnetostructural phase transitions and large magnetic entropy changes in Ag-doped Mn1−xAgxCoGe intermetallic compounds

Published online by Cambridge University Press:  02 January 2019

Anil Aryal Open the ORCID record for Anil Aryal [Opens in a new window] ,
Sudip Pandey Open the ORCID record for Sudip Pandey [Opens in a new window] ,
Igor Dubenko ,
Dipanjan Mazumdar ,
Shane Stadler  and
Naushad Ali
Anil Aryal*
Affiliation:
Department of Physics, Southern Illinois University, Carbondale, IL 62901, USA
Sudip Pandey
Affiliation:
Department of Physics, Southern Illinois University, Carbondale, IL 62901, USA
Igor Dubenko
Affiliation:
Department of Physics, Southern Illinois University, Carbondale, IL 62901, USA
Dipanjan Mazumdar
Affiliation:
Department of Physics, Southern Illinois University, Carbondale, IL 62901, USA
Shane Stadler
Affiliation:
Department of Physics & Astronomy, Louisiana State University, Baton Rouge, LA 70803, USA
Naushad Ali
Affiliation:
Department of Physics, Southern Illinois University, Carbondale, IL 62901, USA
*
Address all correspondence to Anil Aryal at aryalanil@siu.edu
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Abstract

The influence of Ag-doping on the crystallographic structure, magnetic properties, and magnetocaloric effects of Mn1−xAgxCoGe (0.01 ⩽ x ⩽ 0.10) is reported. A transformation of crystal structure from orthorhombic to hexagonal was observed at room temperature. Doping Ag in Mn sites results in a first-order magnetostructural transition near room temperature. A Curie-temperature window of 90 K was obtained between the Curie temperatures of the austenite (Ni2In-type) and martensite (TiNiSi-type) phases. Large magnetic entropy change values of ~22.0 and 9.4 J/kg/K, and refrigerant capacity of 308 and 272 J/kg, were found for x = 0.06 and 0.05, respectively, for μ0ΔH = 5 T.

Type
Research Letters
Information
MRS Communications , Volume 9 , Issue 1 , March 2019 , pp. 315 - 320
Copyright
Copyright © Materials Research Society 2019 

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