Magnetocaloric and magnetoresistance properties of reentrant spin glass Tb 2 Ni 0.94 Si 3.2 alloy
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Magnetocaloric and magnetoresistance properties of reentrant spin glass Tb2Ni0.94Si3.2 alloy U. D. Remya1 · K. Arun1 · S. Swathi1 · Andrea Dzubinska2 · Marian Reiffers3,4 · R. Nagalakshmi1 Received: 28 July 2020 / Accepted: 21 October 2020 © Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract Magnetic, magnetocaloric, and magnetoresistance properties of polycrystalline Tb2Ni0.94Si3.2 alloy have been investigated. Magnetic susceptibilities (AC and DC), remanent magnetization and the heat capacity studies of Tb2Ni0.94Si3.2 provide evidence for the spin glass behavior below the temperature, Tf = 5.2 K. At the Néel temperature, TN = 12.7 K, Tb2Ni0.94Si3.2 alloy orders antiferromagnetically. The presence of metamagnetic transition is observed in isothermal magnetization and magnetoresistance studies. Also, a magnetoresistance of 22% is exhibited by the alloy at temperature T = 4 K in an applied magnetic field of 9 T. A magnetic entropy change of 12 J/kg K with the relative cooling power of 504 J/kg for a magnetic field change of 9 T is observed in the studied alloy. Influence of spin fluctuations and short-range ferromagnetic correlations is reflected in magnetoresistance and relative cooling power. The magnetic and magnetoresistance properties make this alloy as a good magnetocaloric material with moderate magnetoresistance. Keywords Reentrant spin glass · Spin fluctuations · Magnetocaloric effect · Magnetoresistance · Relative cooling power
1 Introduction One of the new emergent, fast growing research area in green technology which helps to achieve eco-friendly, energy efficient cooling, is magnetic refrigeration. Designing a new efficient magnetocaloric refrigerant [1] and potential magnetic refrigerator [2] are the main research subjects in this field. The primary objective of investigations of magnetic refrigerant is to find out materials possessing large values of isothermal entropy change (− ∆SM) and relative cooling power (RCP). Ternary rare earth intermetallics possess large − ∆SM along with first order magnetic transitions, metamagnetic transitions, and magnetic frustration. The mechanisms responsible for enhanced RCP include * R. Nagalakshmi [email protected]; [email protected] 1
Intermetallics and Non‑Linear Optics Laboratory, Department of Physics, National Institute of Technology, Tiruchirappalli 620 015, India
2
CPM-TIP, University Pavol Jozef Safarik, 040 11 Košice, Slovakia
3
Faculty of Humanities and Natural Sciences, Presov University, Presov, Slovakia
4
Institute of Experimental Physics, SAS, Kosice, Slovakia
magnetic phenomena like spin fluctuations or successive magnetic transitions [3, 4]. Among the ternary rare earth intermetallic compounds, R2TX3 (R- Rare earth metal, TTransition metal, X—p block metals) series are important because they show almost all the above-mentioned magnetic properties [5] and they are marked as excellent magnetocaloric refrigerants [6]. In recently studied R 2NiSi3 series, Gd2NiSi3, Er2NiSi3 [7], and R2Ni0.90Si2.95 (R = P
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