Stability of the first-order character of phase transition in HoCo2

Kumar, Ajay; Biswas, Anis; Mudryk, Yaroslav

doi:10.1063/5.0240132

Title: Stability of the first-order character of phase transition in HoCo₂

Journal Article · 25 November 2024 · Journal of Applied Physics

DOI: https://doi.org/10.1063/5.0240132 · OSTI ID:2481291

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Ames Lab., and Iowa State Univ., Ames, IA (United States)

HoCo₂ exhibits a giant magnetocaloric (MC) effect at its first-order magnetostructural phase transition around 77 K, and understanding the thermodynamic nature of this transition in response to external magnetic fields is crucial for its MC applications. In this study, we present a comprehensive investigation of specific heat and magnetization measurements of HoCo ₂ under varying magnetic fields. The specific heat measurements qualitatively indicate a transformation from first- to second-order behavior of this phase transition at higher magnetic fields. However, analysis of the power-law dependence of the magnetic entropy change (ΔS_M∝Hⁿ) and the breakdown of universal behavior in the temperature dependence of ΔS_M suggest that the first-order nature remains intact, even up to 7 T. This stability of the first-order nature is further manifested through the distinctive non-linear behavior of modified Arrott plots, with a negative slope in the 6–7 T range.

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Research Organization:: Ames Laboratory (AMES), Ames, IA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC02-07CH11358

OSTI ID:: 2481291

Report Number(s):: AL-J--677

Journal Information:: Journal of Applied Physics, Journal Name: Journal of Applied Physics Journal Issue: 20 Vol. 136; ISSN 0021-8979

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Title: Stability of the first-order character of phase transition in HoCo2

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Title: Stability of the first-order character of phase transition in HoCo₂