Crystal Field Study of HoNi<sub>5</sub>, by Neutron Scattering

Goremychkin, E. A.; Mühle, E.; Lippold, B.; Chistyakov, O. D.; Savitskii, E.M.

doi:10.1002/pssb.2221270138

Cited by 10 publications

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“…They have therefore been widely investigated for their potential as hydrogen and electrochemical storage material. Also the magnetic properties of RNi 5 compounds have attracted considerable attention, mainly because of their magnetocrystalline anisotropy, related to the interplay of crystal field (CF), spin-orbit, and exchange interactions acting on the R 3+ ions [9][10][11][12][13][14][15] . In fact, as the 3d band of Ni is almost filled by the rare earth valence electrons 16 , the magnetic properties of RNi 5 are practically entirely due to the R ions.…”

Section: Introductionmentioning

confidence: 99%

Low-temperature magnetic properties ofNpNi5

et al. 2014

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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 n f 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 quasi-triplet ground state. The ratio between the expectation value of the magnetic dipole operator and the spin magnetic moment (3 Tz / Sz = +1.43) is positive and large, suggesting a localized character of the 5f electrons. The angular part of the spin-orbit coupling ( ℓ · 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.

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