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    Large Barocaloric Effect with High Pressure-Driving Efficiency in a Hexagonal MnNi0.77Fe0.23Ge Alloy

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    Name:
    Chinese Phys Lett-Large Barocaloric Effect with High Pressure-Driving Efficiency in a Hexagonal MnNi$_{0.77}$Fe$_{0.23}$Ge Alloy.pdf
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    852.4Kb
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    PDF
    Description:
    Accepted manuscript
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    Type
    Article
    Authors
    Zeng, Qingqi
    Shen, Jianlei
    Liu, Enke
    Xi, Xuekui
    Wang, Wenhong
    Wu, Guangheng
    Zhang, Xixiang cc
    KAUST Department
    Material Science and Engineering Program
    Physical Science and Engineering (PSE) Division
    Date
    2020-07-14
    Online Publication Date
    2020-07-14
    Print Publication Date
    2020-07
    Embargo End Date
    2021-07-14
    Submitted Date
    2020-04-22
    Permanent link to this record
    http://hdl.handle.net/10754/664541
    
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    Abstract
    The hydrostatic pressure is expected to be an effective knob to tune the magnetostructural phase transitions of hexagonal MM'X alloys (M and M' denote transition metals and X represents main group elements). We perform magnetization measurements under hydrostatic pressure on an MM'X martensitic MnNi20.77Fe0.23Ge alloy. The magnetostructural transition temperature can be efficiently tuned to lower temperatures by applying moderate pressures, with a giant shift rate of -151 K/GPa. A temperature span of 30 K is obtained under the pressure, within which a large magnetic entropy change of -23 J⋅kg-1K-1 in a field change of 5 T is induced by the mechanical energy gain due to the large volume change. Meanwhile, a decoupling of structural and magnetic transitions is observed at low temperatures when the martensitic transition temperature is lower than the Curie temperature. These results show a multi-parameter tunable caloric effect that benefits the solid-state cooling.
    Citation
    Zeng, Q., Shen, J., Liu, E., Xi, X., Wang, W., Wu, G., & Zhang, X. (2020). Large Barocaloric Effect with High Pressure-Driving Efficiency in a Hexagonal MnNi0.77Fe0.23Ge Alloy. Chinese Physics Letters, 37(7), 076101. doi:10.1088/0256-307x/37/7/076101
    Sponsors
    Supported by the National Natural Science Foundation of China (Grant No. 51722106), the National Key R&D Program of China (Grant No. 2019YFA0704904), Users with Excellence Program of Hefei Science Center CAS (Grant No. 2019HSC-UE009), and Fujian Institute of Innovation, Chinese Academy of Sciences.
    Publisher
    IOP Publishing
    Journal
    Chinese Physics Letters
    DOI
    10.1088/0256-307X/37/7/076101
    arXiv
    2106.02903
    Additional Links
    https://iopscience.iop.org/article/10.1088/0256-307X/37/7/076101
    ae974a485f413a2113503eed53cd6c53
    10.1088/0256-307X/37/7/076101
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; Material Science and Engineering Program

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