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Wallerberger, M.*; Badr, S.*; Hoshino, Shintaro*; Huber, S.*; Kakizawa, Fumiya*; Koretsune, Takashi*; Nagai, Yuki; Nogaki, Kosuke*; Nomoto, Takuya*; Mori, Hitoshi*; et al.
Software X (Internet), 21, p.101266_1 - 101266_7, 2023/02
Times Cited Count：8 Percentile：88.45(Computer Science, Software Engineering)no abstracts in English
-electron state of the heavy fermion superconductor NpPd
Al
and the isostructural familyMetoki, Naoto; Aczel, A. A.*; Aoki, Dai*; Chi, S.*; Fernandez-Baca, J. A.*; Griveau, J.-C.*; Hagihara, Masato*; Hong, T.*; Haga, Yoshinori; Ikeuchi, Kazuhiko*; et al.
JPS Conference Proceedings (Internet), 30, p.011123_1 - 011123_6, 2020/03
Rare earths (4) and actinides (5) provide variety of interesting states realized with competing interactions between the increasing number of electrons. Since crystal field splitting of many-body electron system is smaller than the bandwidth, (1) high resolution experiments are needed, (2) essentially no clear spectrum with well defined peaks is expected in itinerant Ce and U compounds, and (3) Np and Pu is strictly regulated. Therefore, systematic research on magnetic excitations by neutron scattering experiments of localized compounds and rare earth iso-structural reference is useful. We describe the electron states of heavy electron compounds NpPdAl and actinide and rare earth based iso-structural family.
electron state in the heavy fermion superconductor NpPdAlMetoki, Naoto; Aoki, Dai*; Griveau, J.-C.*; Otsuki, Junya*
Journal of the Physical Society of Japan, 89(2), p.024707_1 - 024707_6, 2020/02
Times Cited Count：3 Percentile：31.18(Physics, Multidisciplinary)The pseudo triplet ground state in the heavy-fermion superconductor NpPdAl was concluded. The magnetic susceptibility 
can be reproduced by the singlet ground state 
with the main component of 
and the first excited doublet 
dominated by 
at 
,K. The magnetization curve can be explained from the effective local hamiltonian for pseudo spin 
=1 with 
(
) equivalent to the quadrupole operator 
. The specific heat can be described with the Kondo model normalized to give the entropy R
, corresponding to the pseudo triplet state. The derived Kondo temperature 
,K comparable to the level splitting ,K indicates the contribution of the excited doublet to the possible multi-channel Kondo effect.
-electron states in NpPdAl and the origin of the heavy fermion stateMetoki, Naoto; Aoki, Dai*; Griveau, J.-C.*; Otsuki, Junya*
no journal, ,
Non-Krammers trivalent Np
(5
) ion in the heavy fermion superconductor NpPdAl shows =4, similar to Pr. We determined the singlet ground state of 
and the first excited doublet of 
above 49 K from the quantitative analysis of the magnetic susceptibility and the magnetization curve. The must contribute to the heavy fermion, since the singlet ground state alone cannot, where 2-channel Kondo effect appears based on . The low-temperature specific heat of NpPdAl can be explained with the superposition of the heavy fermion state and localized Schottky anomaly, where the total entropy was maintained 
ln3 for pseudo-triplet state. The 
-coupling scheme of AnPdAl can be described by the corresponding 
- coupling scheme, where Pu and Np are the hole version of Ce and Pr. The in NpPdAl is stabilized with the same mechanism as in PrTX
, both exhibit the unconventional superconductivity.
