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

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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.

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Acknowledgments

This work was supported by the US Department of Energy (DOE), Office of Science, Basic Energy Sciences (BES) under Award No. DE-FG02-06ER46291 (SIU) and DE-FG02-13ER46946 (LSU).

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Authors and Affiliations

  1. Department of Physics, Southern Illinois University, Carbondale, IL, 62901, USA

    Anil Aryal, Sudip Pandey, Igor Dubenko & Dipanjan Mazumdar

  2. Department of Physics & Astronomy, Louisiana State University, Baton Rouge, LA, 70803, USA

    Shane Stadler

  3. Department of Physics, Southern Illinois University, Carbondale, IL, 62901, USA

    Naushad Ali

Authors
  1. Anil Aryal
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  2. Sudip Pandey
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  3. Igor Dubenko
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  4. Dipanjan Mazumdar
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  5. Shane Stadler
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  6. Naushad Ali
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Correspondence to Anil Aryal.

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Supplementary material

The supplementary material for this article can be found at https://doi.org/10.1557/mrc.2018.228.

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Aryal, A., Pandey, S., Dubenko, I. et al. Magnetostructural phase transitions and large magnetic entropy changes in Ag-doped Mn1−xAgxCoGe intermetallic compounds. MRS Communications 9, 315–320 (2019). https://doi.org/10.1557/mrc.2018.228

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