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Electrical resistivity and thermodynamic properties of the ferromagnet Nd2Pt2In


Strydom,  A. M.
Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Tchokonte, M. B. T., Mboukam, J. J., Bashir, A. K. H., Sondezi, B. M., Kumar, K. R., Strydom, A. M., et al. (2018). Electrical resistivity and thermodynamic properties of the ferromagnet Nd2Pt2In. Journal of Alloys and Compounds, 753, 41-45. doi:10.1016/j.jallcom.2018.04.193.

The Nd2Pt2In compound was investigated by means of electrical resistivity rho(T), heat capacity C-p (T), magnetic susceptibility x(T), magnetization M(mu(0)(H) and magnetocaloric effect (MCE) measurements. The material orders ferromagnetically at T-C = 16 K with a second - order phase transition. In the ordered state, rho(T) can be represented in terms of ferromagnetic (FM) spin - wave dispersion with an energy gap Delta(R) = 13(1) K in zero field. In concert, the C-p(T) data in this region can be well described by the same model getting Delta(C) = 8(1) K in zero field. Above T-C, the rho(T) variation is characteristic of electron - phonon interaction in the presence of s - d scattering and crystalline-electric field (CEF). The 4f - electron specific heat shows a Schottky - type anomaly around 60 K associated with CEF. On the other hand, C-p(T) data of the non-magnetic homologue La2Pt2In can be described by the Debye - Einstein model, giving a Debye and Einstein temperature values of 190.3(5) K and 69.8(7) K respectively. At high temperatures, the x(T) data follows the Curie - Weiss relation with an effective magnetic moment mu(eff) = 3.61(2) mu(B) and a Weiss temperature theta(p) = 17(1) K. The magnitude of MCE was estimated from the isothermal magnetization data to be 6.25 J/(kg.K), 5.01 J/(kg.K), 3.18 J/(kg.K) and 0.47 J/(kg.K) for a field change of 7 T, 5 T, 3 T and 1 T, respectively. The characteristic behaviour of the isothermal magnetic entropy change points to a second order character of the FM phase transition. (C) 2018 Elsevier B.V. All rights reserved.