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Multiple magnetic transitions and magnetocaloric effect of Tb_(4)Coln alloy

Journal of Rare Earths 2023年第11期41卷 1721-1727,I0003页

作者： Remya U.D. Arun K. Swathi S. Athul S.R. andrea dzubinska Marian Reiffers Nagalakshmi R. Intermetallics and Non-linear Optics Laboratory Department of PhysicsNational Institute of TechnologyTiruchirappalli620015India CPM-TIP University Pavol Jozef Safarik04011KošiceSlovakia Faculty of Humanities and Natural Sciences Presov UniversityPresovSlovakia Institute of Experimental Physics SASKosiceSlovakia

We report on the magnetic,magnetocaloric,thermal,and electrical transport properties of Tb_(4)Coln alloy,which crystallizes in two phases,Tb_6Co_(2.1)In_(0.8)(space group Immm)and Tb_(2)In_(0.9)Co_(0.1)(space group P6_(3)/mmc),respectively.The alloy reveals three successive magnetic transitions around T_(1)(163 K),T_(2)(50 K),and T_(3)(29 K),respectively,associated with paramagnetic to ferromagnetic transition and two sequential antiferromagnetic transitions.The low-temperature transition T_(3) follows the first-order magnetic behavior and exhibits the field-induced magnetic transition.Meanwhile,T_(2) and T_(1) are found to be second-order in nature which opens a possibility for hysteresis-free magnetocaloric application.The magnetocaloric properties are determined using different magnetocaloric figures of merits such as-ΔS_(M),ΔT_(ad).RCP,and TEC(10).Additionally,the universal curve behavior in the isothermal entropy change unveils the variation in critical exponents around T_(1) and T_(2) due to the magnetic inhomogeneity in the alloy.Besides,the electrical transport properties of the metallic alloy denote the maximum magnetoresistance of-10%around T_(1).

关键词： Multiple magnetic transitions Order of magnetic transition Magnetocaloric effect Magnetoresistance Universal curve behavior Rare earths

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Magnetocaloric and magneto-transport properties of Gd_(10)Co_(20)Si_(70) alloy

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Journal of Rare Earths 2019年第1期37卷 74-79,M0004页

作者： T.P.Rashid K.Arun Ivan Curlik Sergej Ilkovic Marian Reiffers andrea dzubinska R.Nagalakshmi Intermetallics and Non-Linear Optics Laboratory Department of Physics National Institute of Technology(India) Faculty of Humanities and Natural Sciences Presov University Faculty of Natural Sciences P.J.Safarik University

We report the results of magnetic, thermodynamic, transport and magnetocaloric effect (MCE) studies of newly synthesized Gd_(10)Co_(20)Si_(70) alloy. These measurements confirm an antiferromagnetic transition at T_N=9 K. Both MCE and magnetoresistance (MR) show quadratic dependence on the applied magnetic field, indicating the presence of spin fluctuations in the alloy. The maximum values of the magnetic entropy change determined from the isothermal magnetization data for magnetic field change of 7 and9 T are found to be 10.5 and 15.6 J/kg·K, respectively. As a consequence of the spin fluctuations effect, the MCE peaks are pulled towards high temperature side as asymmetrically broadened peak. The MR attains a large positive value of 73%at 2 K in 8 T. The large MR and reversible MCE make this alloy an attractive multifunctional magnetic material.

关键词： Rare earth-transition metal alloy Magnetic properties Magnetocaloric effect Magnetoresistance Spin fluctuations

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