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|Title:||Low-temperature magnetic properties of NpNi5|
|Authors:||HEN AMIR; COLINEAU Jennifer; ELOIRDI Rachel; GRIVEAU Jean-Christophe; MAGNANI Nicola; WILHELM F.; ROGALEV A.; SANCHEZ J.p.; SHICK A.b.; HALEVY Itzhak; ORION I.; CACIUFFO Roberto|
|Citation:||PHYSICAL REVIEW B vol. 90 no. 5 p. 054408-1 - 054408-10|
|Publisher:||AMER PHYSICAL SOC|
|Type:||Articles in periodicals and books|
|Abstract:||We present the result of an extended experimental characterization of the hexagonal intermetallic Haucke compound NpNi5. By combining macroscopic and shell-specific techniques, we determine the 5f-shell occupation number nf close to 4 for the Np ions, together with orbital and spin components of the ordered moment in the ferromagnetic phase below Tc=16 K (μS = −1.88 μB and μL = 3.91 μB). The apparent coexistence of ordered and disordered phases observed in the Mössbauer spectra is explained in terms of slow relaxation between the components of a quasitriplet ground state. The ratio between the expectation value of the magnetic dipole operator and the spin magnetic moment (3Tz/Sz = +1.43) is positive and large, suggesting a localized character of the 5f electrons. The angular part of the spin-orbit coupling ( · s = −5.55) is close to the value of -6.25 calculated for trivalent Np ions in intermediate coupling approximation. The results are discussed against the prediction of first-principle electronic structure calculations based on the spin-polarized local spin density approximation plus Hubbard interaction, and of a mean field model taking into account crystal field and exchange interactions.|
|JRC Directorate:||Nuclear Safety and Security|
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