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

2 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

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

Publisher Copyright:
© 2021 Elsevier Ltd

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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doi = "10.1016/j.mtcomm.2021.102091",

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AB - 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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