Critical analysis of chemical and hydrostatic pressure-induced Gd5Si2Ge2 alloy

Sanjay Sharma; Akhilesh Kumar Patel; Pramod Kumar

doi:10.1016/j.mtcomm.2021.102091

Critical analysis of chemical and hydrostatic pressure-induced Gd₅Si₂Ge₂ alloy

Sanjay Sharma, Akhilesh Kumar Patel, Pramod Kumar

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

5 Scopus citations

Abstract

We have investigated the consequences of external pressure on the magneto-thermal, critical behavior, and magnetocaloric properties of the polycrystalline alloy Gd₅Si₂Ge₂ and Cu-substitute Gd₅Si₂Ge_1.9Cu_0.1 alloy. The ordering temperature of the parent compound is found to be strongly dependent on the external pressure dT_c/dP ≅+4.91 K/kbar whereas insensitive for the Cu-substituted alloy (dT_c/dP≅+0.47 K/kbar). Modified Arrott plot (MAP) and Kouvel-Fisher (KF) methods have been used to extract the critical exponents to study the critical behavior. The critical behavior of both the polycrystalline alloys is in a close match with the three dimensional (3D)-Heisenberg class of universalities. In the parent alloy, the critical field for metamagnetic transition increases with the pressure. The pressure-induced coupling has a remarkable effect on the refrigeration capacity (RC) (355 J/kg K to 581 J/kg K).

Original language	English
Article number	102091
Journal	Materials Today Communications
Volume	26
DOIs	https://doi.org/10.1016/j.mtcomm.2021.102091
State	Published - Mar 2021
Externally published	Yes

Bibliographical note

Publisher Copyright:
© 2021 Elsevier Ltd

Funding

One of the authors (Pramod Kumar) thanks DST, Govt. of India for providing financial support for this work.

Funders	Funder number
Department of Science and Technology, Government of West Bengal

Keywords

Critical analysis
Magneto-thermal effect
Magnetocaloric effect
Pressure-induced alloy
Universality class

Access to Document

10.1016/j.mtcomm.2021.102091

Cite this

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title = "Critical analysis of chemical and hydrostatic pressure-induced Gd5Si2Ge2 alloy",

abstract = "We have investigated the consequences of external pressure on the magneto-thermal, critical behavior, and magnetocaloric properties of the polycrystalline alloy Gd5Si2Ge2 and Cu-substitute Gd5Si2Ge1.9Cu0.1 alloy. The ordering temperature of the parent compound is found to be strongly dependent on the external pressure dTc/dP ≅+4.91 K/kbar whereas insensitive for the Cu-substituted alloy (dTc/dP≅+0.47 K/kbar). Modified Arrott plot (MAP) and Kouvel-Fisher (KF) methods have been used to extract the critical exponents to study the critical behavior. The critical behavior of both the polycrystalline alloys is in a close match with the three dimensional (3D)-Heisenberg class of universalities. In the parent alloy, the critical field for metamagnetic transition increases with the pressure. The pressure-induced coupling has a remarkable effect on the refrigeration capacity (RC) (355 J/kg K to 581 J/kg K).",

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