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|Title:||Magnetic Properties of Stoichiometric NpFe4Al8|
|Authors:||GONCALVES A.p.; ALMEIDA M.; CARDOSO C.; GASCHE T.; GODINHO M.; BOULET Pascal; COLINEAU ERIC; WASTIN FRANCK; REBIZANT JEAN|
|Citation:||JOURNAL OF PHYSICS-CONDENSED MATTER vol. 17 p. 909-922|
|Publisher:||IOP PUBLISHING LTD|
|Type:||Articles in periodicals and books|
|Abstract:||The compound NpFe4Al8 was prepared by direct arc melting of the constituent elements, followed by annealing. It crystallizes in the ThMn12-type structure (space group I4/mmm, a = 8.7480(5) A, c = 5.0372(4) A), with the iron atoms completely and only occupying the 8f positions. Magnetization measurements (T = 2–300 K, B = 0–7 T) show a ferromagnetic-type transition at TC = 135(2) K and a second anomaly at 118(3) K. The low temperature magnetization cycle is characterized by a hysteresis with a step similar to that previously observed forUFe4Al8 single crystals. First-principles density functional theory calculations of the NpFe4Al8 band structure point to a magnetic structure similar to that of UFe4Al8, in agreement with the observed magnetization cycle. The calculations indicate that the neptunium moment is aligned along one of the a or b axes, and the iron moments form a noncollinear structure in the a–b plane, with the antiferromagnetic and ferromagnetic contributions perpendicular and antiparallel to the neptunium spin moment, respectively.|
|JRC Institute:||Nuclear Safety and Security|
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