Field dependence of magnetic entropy change in Mn5Ge3 near room temperature

Lalita; A. Rathi; Pardeep; Ajay Kumar Verma; B. Gahtori; Arvind Gautam; R. P. Pant; P. D. Babu; G. A. Basheed

doi:10.1016/j.jallcom.2021.159908

Field dependence of magnetic entropy change in Mn₅Ge₃ near room temperature

Lalita, A. Rathi, Pardeep, Ajay Kumar Verma, B. Gahtori, Arvind Gautam, R. P. Pant, P. D. Babu, G. A. Basheed

Research output: Contribution to journal › Article › peer-review

13 Citations (Scopus)

Abstract

We present the investigation of the magnetic field dependence of magneto-caloric properties in Mn₅Ge₃ with a near-room temperature second order phase transition (SOPT) at T_c ≃ 297.5 K. The isothermal entropy change (∣ΔS_M∣) exhibits a high-field (H ≥ 3 T) power-law behavior with exponent value of 0.58 (near TC), in corroboration with critical exponents study. The maximum entropy change (∣ΔS_M∣_max∣) exhibits a H^2∕3 dependence with addition of spatial inhomogeneity and higher order magnetization (up to M⁶) terms in Landau′s theory of SOPT. The nearly identical magnetic field evolution of magnetocaloric effect and a reasonably high refrigerant capacity of 398 J/kg (at 5 T) for inexpensive and abundant Mn₅Ge₃ make it a promising alternative to rare-earth Gadolinium for near-room temperature magnetic refrigeration technology.

Original language	English
Article number	159908
Journal	Journal of Alloys and Compounds
Volume	876
DOIs	https://doi.org/10.1016/j.jallcom.2021.159908
Publication status	Published - 25 Sept 2021
Externally published	Yes

Keywords

Critical exponents
Magnetic entropy change
Magnetocaloric effect

ASJC Scopus subject areas

Mechanics of Materials
Mechanical Engineering
Metals and Alloys
Materials Chemistry

Access to Document

10.1016/j.jallcom.2021.159908

Cite this

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title = "Field dependence of magnetic entropy change in Mn5Ge3 near room temperature",

abstract = "We present the investigation of the magnetic field dependence of magneto-caloric properties in Mn5Ge3 with a near-room temperature second order phase transition (SOPT) at Tc ≃ 297.5 K. The isothermal entropy change (∣ΔSM∣) exhibits a high-field (H ≥ 3 T) power-law behavior with exponent value of 0.58 (near TC), in corroboration with critical exponents study. The maximum entropy change (∣ΔSM∣max∣) exhibits a H2∕3 dependence with addition of spatial inhomogeneity and higher order magnetization (up to M6) terms in Landau′s theory of SOPT. The nearly identical magnetic field evolution of magnetocaloric effect and a reasonably high refrigerant capacity of 398 J/kg (at 5 T) for inexpensive and abundant Mn5Ge3 make it a promising alternative to rare-earth Gadolinium for near-room temperature magnetic refrigeration technology.",

keywords = "Critical exponents, Magnetic entropy change, Magnetocaloric effect",

author = "Lalita and A. Rathi and Pardeep and Verma, {Ajay Kumar} and B. Gahtori and Arvind Gautam and Pant, {R. P.} and Babu, {P. D.} and Basheed, {G. A.}",

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TY - JOUR

T1 - Field dependence of magnetic entropy change in Mn5Ge3 near room temperature

AU - Lalita,

AU - Rathi, A.

AU - Pardeep,

AU - Verma, Ajay Kumar

AU - Gahtori, B.

AU - Gautam, Arvind

AU - Pant, R. P.

AU - Babu, P. D.

AU - Basheed, G. A.

PY - 2021/9/25

Y1 - 2021/9/25

N2 - We present the investigation of the magnetic field dependence of magneto-caloric properties in Mn5Ge3 with a near-room temperature second order phase transition (SOPT) at Tc ≃ 297.5 K. The isothermal entropy change (∣ΔSM∣) exhibits a high-field (H ≥ 3 T) power-law behavior with exponent value of 0.58 (near TC), in corroboration with critical exponents study. The maximum entropy change (∣ΔSM∣max∣) exhibits a H2∕3 dependence with addition of spatial inhomogeneity and higher order magnetization (up to M6) terms in Landau′s theory of SOPT. The nearly identical magnetic field evolution of magnetocaloric effect and a reasonably high refrigerant capacity of 398 J/kg (at 5 T) for inexpensive and abundant Mn5Ge3 make it a promising alternative to rare-earth Gadolinium for near-room temperature magnetic refrigeration technology.

AB - We present the investigation of the magnetic field dependence of magneto-caloric properties in Mn5Ge3 with a near-room temperature second order phase transition (SOPT) at Tc ≃ 297.5 K. The isothermal entropy change (∣ΔSM∣) exhibits a high-field (H ≥ 3 T) power-law behavior with exponent value of 0.58 (near TC), in corroboration with critical exponents study. The maximum entropy change (∣ΔSM∣max∣) exhibits a H2∕3 dependence with addition of spatial inhomogeneity and higher order magnetization (up to M6) terms in Landau′s theory of SOPT. The nearly identical magnetic field evolution of magnetocaloric effect and a reasonably high refrigerant capacity of 398 J/kg (at 5 T) for inexpensive and abundant Mn5Ge3 make it a promising alternative to rare-earth Gadolinium for near-room temperature magnetic refrigeration technology.

KW - Critical exponents

KW - Magnetic entropy change

KW - Magnetocaloric effect

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DO - 10.1016/j.jallcom.2021.159908

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