Metamagnetic Transitions and Magnetocaloric Properties of HoCr1-xFexO3 (x = 0.25 and 0.75) Compounds

Kotnana, Ganesh and Babu, P. D. and Jammalamadaka, S Narayana (2022) Metamagnetic Transitions and Magnetocaloric Properties of HoCr1-xFexO3 (x = 0.25 and 0.75) Compounds. Journal of Superconductivity and Novel Magnetism, 35 (7). pp. 2057-2067. ISSN 1557-1939

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Abstract

We report on the magnetocaloric properties of HoCr1-xFexO3 (x = 0.25 and 0.75) compounds studied by magnetic and specific heat measurements. The magnetic entropy change (–ΔSM) reaches a maximum value of 10.32 J/kg-K and 10.94 J/kg-K around 11 K with a maximum magnetic field of 9 T in HoCr0.75Fe0.25O3 and HoCr0.25Fe0.75O3 compounds respectively. The corresponding adiabatic temperature change (ΔTad) values are found to be 13.7 K and 18.5 K with a maximum magnetic field of 7 T from the specific heat studies. The origin for the obtained large values of –ΔSM and ΔTad are attributed to the evidenced metamagnetic transition and Ho3+ ordering. The evidenced Schottky anomaly below 15 K in the specific heat data is ascribed to crystal field splitting of 5I8 levels of Ho3+ paramagnetic ions. The Debye temperatures and splitting energy of Ho3+ ground state levels have been evaluated by fitting the specific heat data. The present results suggest that HoCr1-xFexO3 (x = 0.25 and 0.75) compounds could be promising candidates for the refrigeration applications below 30 K. © 2022, The Author(s), under exclusive licence to Springer Science+Business Media, LLC, part of Springer Nature.

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IITH Creators:

IITH Creators	ORCiD
Jammalamadaka, S Narayana	https://orcid.org/0000-0001-9235-7012

Item Type:

Article

Additional Information:

We would like to acknowledge the Indian Institute of Technology, Hyderabad and Department of Science and Technology (DST) ( Project #SR/FTP/PS-190/2012 ) for the financial support. We are also grateful to UGC-DAE Consortium Indore (Project # CSR-IC/CRS-162/2015–16/19) and UGC – DAE consortium Mumbai (UDCSR/MUM/AO/CRS-M-269/2020) for the financial support and their extended facilities.

Uncontrolled Keywords:

Entropy; Magnetism; Magnetocaloric effect; Specific heat

Subjects:

Physics

Divisions:

Department of Physics

Depositing User:

. LibTrainee 2021

Date Deposited:

22 Jul 2022 09:22

Last Modified:

22 Jul 2022 09:22