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Issue 19, 2018
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Observation of short range order driven large refrigerant capacity in chemically disordered single phase compound Dy2Ni0.87Si2.95

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Abstract

In this work, we report the successful synthesis of a new intermetallic compound Dy2Ni0.87Si2.95 forming in single phase only with a chemically disordered structure. The random distribution of Ni/Si and crystal defects create a variation in the local electronic environment between the magnetic Dy ions. In the presence of both disorder and competing exchange interactions driven magnetic frustration, originating due to c/a ∼ 1, the compound undergoes spin freezing behaviour below 5.6 K. In the non-equilibrium state below the spin freezing behaviour, the compound exhibits aging phenomena and magnetic memory effects. In the magnetically short-range ordered region, much above the freezing temperature, an unusual occurrence of considerable magnetic entropy change, −ΔSmaxM ∼ 21 J kg−1 K−1 with large cooling power RCP ∼ 531 J kg−1 and adiabatic temperature change, ΔTad ∼ 10 K for a field change of 70 kOe, is observed for this short range ordered cluster-glass compound without any magnetic hysteresis loss.

Graphical abstract: Observation of short range order driven large refrigerant capacity in chemically disordered single phase compound Dy2Ni0.87Si2.95

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Publication details

The article was received on 26 Feb 2018, accepted on 13 Apr 2018 and first published on 13 Apr 2018


Article type: Paper
DOI: 10.1039/C8CP01280F
Citation: Phys. Chem. Chem. Phys., 2018,20, 13580-13587
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    Observation of short range order driven large refrigerant capacity in chemically disordered single phase compound Dy2Ni0.87Si2.95

    S. Pakhira, C. Mazumdar, D. Choudhury, R. Ranganathan and S. Giri, Phys. Chem. Chem. Phys., 2018, 20, 13580
    DOI: 10.1039/C8CP01280F

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