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Effect of Hydrogenation on the Magnetic and Magnetocaloric Properties of Rare Earth Intermetallic Compounds Tb0.33Ho0.33Er0.33Ni and Dy0.33Ho0.33Er0.33Ni

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Abstract

Multicomponent rare earth intermetallic compounds Tb0.33Ho0.33Er0.33Ni and Dy0.33Ho0.33Er0.33Ni crystallize in orthorhombic FeB-type structure (Space group Pnma, No. 62, oP8) and order ferromagnetically at 59 K and 40 K (TC) respectively. Hydrides of these samples show a presence of ~ 10-nm size nanoparticles with unit cell volume expansion. Magnetization measurements reveal that hydrides Tb0.33Ho0.33Er0.33NiH1.9 and Dy0.33Ho0.33Er0.33NiH1.9 remain paramagnetic from 300 K down to 5 K. Magnetization value at 5 K in 70 kOe field is ~ 5.1 µB/f.u. and 5.5 µB/f.u., respectively, for Tb0.33Ho0.33Er0.33NiH1.9 and Dy0.33Ho0.33Er0.33NiH1.9 samples. Despite the lack of ferromagnetic order, hydrides exhibit large low-temperature magnetocaloric effect with maximum isothermal magnetic entropy change values of about − 11.6 Jkg−1 K−1 at 14 K and – 12.9 Jkg−1 K−1 at 8 K respectively for 50 kOe magnetic field change.

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The data are available upon request from the corresponding author.

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Acknowledgements

Author A. P. M. thanks UGC for the fellowship. 

Funding

R. N. thanks the Science and Engineering Research Board (SERB), New Delhi, for support under grant number CRG/2022/007828.

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Authors and Affiliations

  1. Department of Physics, Indian Institute of Technology Madras, Chennai, 600036, India

    Abhaya Prasada Mohapatra, Dhanya A. R., S. Ramaprabhu & R. Nirmala

  2. Defence Metallurgical Research Laboratory, Hyderabad, 500058, India

    J. Arout Chelvane

  3. Department of Chemistry, Moscow Lomonosov State University, Moscow, 119992, Russia

    A. V. Morozkin

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  1. Abhaya Prasada Mohapatra
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  2. Dhanya A. R.
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  3. J. Arout Chelvane
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  4. A. V. Morozkin
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  5. S. Ramaprabhu
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Contributions

R. N., J. A. C. and S. R. P. contributed to conception and design of the work. A. P. M., D. A. R. and A. V. M. have done data acquisition and/or data analysis. All authors drafted the work and contributed equally to writing and reviewing the manuscript.

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Correspondence to R. Nirmala.

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Mohapatra, A.P., A. R., D., Chelvane, J.A. et al. Effect of Hydrogenation on the Magnetic and Magnetocaloric Properties of Rare Earth Intermetallic Compounds Tb0.33Ho0.33Er0.33Ni and Dy0.33Ho0.33Er0.33Ni. J Supercond Nov Magn (2024). https://doi.org/10.1007/s10948-024-06747-0

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