Title: Ferromagnetic behavior of the Kondo lattice compound Np2PtGa3
Authors: TRAN V.h.GRIVEAU Jean-ChristopheELOIRDI RachelCOLINEAU Eric
Citation: PHYSICAL REVIEW B vol. 89 no. 5 p. 054424
Publication Year: 2014
JRC N°: JRC89614
ISSN: 1098-0121
URI: http://journals.aps.org/prb/abstract/10.1103/PhysRevB.89.054424
DOI: 10.1103/PhysRevB.89.054424
Type: Articles in periodicals and books
Abstract: In this study we report the results of study on a novel ternary Np2PtGa3 compound. The x-raypowder diffraction analysis indicates that the compound crystallizes in the orthorhombic CeCu2-type crystal structure (space group Imma) with lattice parameters a = 0.4409(2) nm, b = 0.7077(3) nm and c = 0.7683(3) nm at room temperature. The measurements of dc magnetization, specific heat and electron transport properties in the temperature range 1.7 - 300 and in magnetic fields up to 9 T reveal that this intermetallic compound belongs to a class of ferromagnetic Kondo systems. The Curie temperature of TC 26 K is determined from the magnetization and specific heat data. An enhanced coefficient of the electronic specific heat of = 180 mJ/mol.Np K2 and -lnT dependence of the electrical resistivity indicate the presence of Kondo effect and can be understood in terms of the S = 1 underscreened Kondo-lattice model. The estimated Kondo temperature TK 24 K, Hall mobility of 16.8 cm2/Vs and effective mass of 83 me are consistent with assumption that the heavy-fermion state develops in Np2PtGa3 at low temperatures. We compare the observed properties of Np2PtGa3 to that found in Np2PdGa3 and discuss their difference in regard to change in the exchange interaction between the conduction and localized 5f electrons. We have used the Fermi wave vector kF to evaluate the Rudermann-Kittel-Kasuya-Yosida (RKKY) exchange. Based on experimental data of the (U, Np)2(Pd, Pt)Ga3 compounds we suggest that the evolution of the magnetic ground states in these ferromagnetic Kondo lattices can be explained within the RKKY formalism.
JRC Directorate:Nuclear Safety and Security

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