Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
O NMR, and 
Np M
ssbauer study of U
Np
O
Martel, L.*; Hen, A.*; Tokunaga, Yo; Kinnart, F.*; Magnani, N.*; Colineau, E.*; Griveau, J.-C.*; Caciuffo, R.*
Physical Review B, 98(1), p.014410_1 - 014410_8, 2018/07
Times Cited Count：5 Percentile：25.82(Materials Science, Multidisciplinary)We report a study of the magnetic and electronic properties of the UNpO solid solution, based on dc- and ac- magnetisation, Np Mssbauer spectroscopy, O Nuclear Magnetic Resonance (NMR), and specific heat measurements. The compound orders antiferromagnetically at T
= 17 K. The different techniques reveal the complexity of this system with:(1) a spatial distribution of ordered moments, (2) a small Np ordered moment, and (3) an additional specific heat anomaly at 7.4 K, with a residual value at very low temperature and a reduced magnetic entropy. The results are compared to the end-members of the series, UO and NpO, as well as to the other solid solutions previously reported in this system. We discuss how the properties of UNpO add new input to the trend previously reported for the series, in view of the models that have been previously proposed.
AlUmmarino, G. A.*; Caciuffo, R.*; Chudo, Hiroyuki; Kambe, Shinsaku
Physical Review B, 82(10), p.104510_1 - 104510_7, 2010/09
Times Cited Count：4 Percentile：21.96(Materials Science, Multidisciplinary)The energy scale 
of the electron-boson spectral function in the heavy-fermion, 
-wave superconductor NpPdAl is predicted on the basis of Eliashberg theory calculations. Assuming a spectral function shape typical for antiferromagnetic spin fluctuations, and imposing constraints provided by the experimental values for the critical temperature and the low-temperature energy gap, one obtains values of of about 2-2.5 meV, slightly dependent from the strength of the Coulomb pseudopotential. These values are in excellent agreement with the characteristic magnetic fluctuations energy estimated from NMR measurements of the nuclear-spin-lattice relaxation time at the Al site. The calculated temperature dependence of the upper critical field, the local spin susceptibility, and the nuclear spin-lattice relaxation rate is also in good agreement with available experimental data.
and NpCoGaDetlefs, B.*; Wilkins, S. B.*; Caciuffo, R.*; Paix
o, J. A.*; Kaneko, Koji; Honda, Fuminori*; Metoki, Naoto; Bernhoeft, N.*; Rebizant, J.*; Lander, G. H.*
Physical Review B, 77(2), p.024425_1 - 024425_10, 2008/01
Times Cited Count：17 Percentile：58.3(Materials Science, Multidisciplinary)We report a resonant X-ray scattering study of the antiferromagnetic neptunium compounds NpCoGa and NpRhGa. Large resonant signals of magnetic dipole character are observed below the N
el temperatures. The signals at the Np edges confirm the behavior determined previously from neutron diffraction. On application of a magnetic field of 9 T along the [010] direction in NpRhGa, we observe a change in the population of different [110]-type domains. We also observe a magnetic dipole signal at the Ga 
edge, similarly to the reported UGa
case, that can be interpreted within a semilocalized model as an orbital polarization of the Ga 4
states induced via strong hybridization with the Np 5
valence band. Quantitative analysis of the signal shows that the Ga dipole on the two different Ga sites follows closely the Np magnetic moment reorientation in NpRhGa. The ratios of the signals on the two inequivalent Ga sites are not the same for the different compounds.
(T=Co and Rh); Experiment and theoryJanousova, B.*; Di Matteo, S.*; Wilkins, S. B.*; Caciuffo, R.*; Paixo, J. A.*; Honda, Fuminori; Metoki, Naoto; Colineau, E.*; Lander, G. H.
no journal, ,
no abstracts in English
Magnani, N.*; Caciuffo, R.*; Colineau, E.*; Wastin, F.*; Amoretti, G.*; Carretta, S.*; Santini, P.*; Baraldi, A.*; Capelletti, R.*; Adroja, D. T.*; et al.
no journal, ,
no abstracts in English
