Refine your search:     
Report No.
 - 
Search Results: Records 1-9 displayed on this page of 9
  • 1

Presentation/Publication Type

Initialising ...

Refine

Journal/Book Title

Initialising ...

Meeting title

Initialising ...

First Author

Initialising ...

Keyword

Initialising ...

Language

Initialising ...

Publication Year

Initialising ...

Held year of conference

Initialising ...

Save select records

Journal Articles

sparse-ir; Optimal compression and sparse sampling of many-body propagators

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:4 Percentile:91.34(Computer Science, Software Engineering)

no abstracts in English

Journal Articles

The $$f$$-electron state of the heavy fermion superconductor NpPd$$_5$$Al$$_2$$ and the isostructural family

Metoki, 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$$f$$) and actinides (5$$f$$) provide variety of interesting states realized with competing interactions between the increasing number of $$f$$ electrons. Since crystal field splitting of many-body $$f$$ 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 $$f$$ electron states of heavy electron compounds NpPd$$_5$$Al$$_2$$ and actinide and rare earth based iso-structural family.

Journal Articles

Pseudo-triplet 5$$f$$ electron state in the heavy fermion superconductor NpPd$$_5$$Al$$_2$$

Metoki, 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:31.8(Physics, Multidisciplinary)

The pseudo triplet ground state in the heavy-fermion superconductor NpPd$$_5$$Al$$_2$$ was concluded. The magnetic susceptibility $$chi$$ can be reproduced by the singlet ground state $$Gamma_{t1}$$ with the main component of $$|0rangle$$ and the first excited doublet $$Gamma_{t5}$$ dominated by $$|pm1rangle$$ at $$Delta E=49$$,K. The magnetization curve can be explained from the effective local hamiltonian for pseudo spin $$J$$=1 with $$DJ_z^2$$($$D=Delta E$$) equivalent to the quadrupole operator $$O_{20}$$. The specific heat can be described with the Kondo model normalized to give the entropy R$$ln3$$, corresponding to the pseudo triplet state. The derived Kondo temperature $$T_{rm K}=55$$,K comparable to the level splitting $$Delta E=49$$,K indicates the contribution of the excited doublet $$Gamma_{t5}$$ to the possible multi-channel Kondo effect.

Oral presentation

Development of a long-life vitrification melter

Kato, Junya; Miyauchi, Atsushi; Aoshima, Atsushi; Shiotsuki, Masao; Yamashita, Teruo; Nakajima, Masayoshi; Morikawa, Yo; Miura, Akihiko; Fukui, Toshiki*; Yamasaki, Akito*; et al.

no journal, , 

no abstracts in English

Oral presentation

Feasibility study on a long-life vitrification melter

Yamashita, Teruo; Miura, Akihiko; Kato, Junya; Shiotsuki, Masao; Ono, Isamu*; Fukui, Toshiki*; Yamasaki, Akito*; Matsumoto, Shiro*

no journal, , 

The objective of this development is to extend vitrification melter life-time to reduce burden of the high level radioactive waste management by applying advanced technologies. The candidate concepts of the long-life melter were studied with evaluation of adopted important advanced technologies such as skull layer conditions and the commutative electrode structure. It was concluded that such technology has a potential to extend melter life as 20 years even in the preliminary studies. Based on the obtained results, after the following fiscal year, evaluation of each component, small scale melter examination, and development and evaluation of simulation tool are carried out.

Oral presentation

Development of the long-life vitrification melter, 2; Temperature dependence on corrosion behavior of the refractory materials

Miura, Akihiko; Kato, Junya; Yamashita, Teruo; Shiotsuki, Masao; Matsumoto, Shiro*

no journal, , 

no abstracts in English

Oral presentation

Development of long-life vitrification melter, 6; Static corrosion tests of electrode materials

Kato, Junya; Miura, Akihiko; Shiotsuki, Masao; Yamashita, Teruo

no journal, , 

To examine long-life vitrification melter, static corrosion tests of electrode materials are conducted to measure corrosion rate. Samples taken from the tests are observed and analyzed using SEM/EDX. As a result, NCF690 and RS311 which are the nickel based alloy show the high corrosion resistance in molten glass because high dense CrO$$_{2}$$ layer is observed at the glass contact surface.

Oral presentation

Development of the long-life vitrification melter, 9; Life estimation of refractory materials installed in vitrification melter

Kato, Junya; Miura, Akihiko; Yamashita, Teruo; Shiotsuki, Masao

no journal, , 

no abstracts in English

Oral presentation

5$$f$$-electron states in NpPd$$_5$$Al$$_2$$ and the origin of the heavy fermion state

Metoki, Naoto; Aoki, Dai*; Griveau, J.-C.*; Otsuki, Junya*

no journal, , 

Non-Krammers trivalent Np$$^{3+}$$(5$$f^4$$) ion in the heavy fermion superconductor NpPd$$_5$$Al$$_2$$ shows $$J$$=4, similar to Pr$$^{3+}$$. We determined the singlet ground state of $$Gamma_1$$ and the first excited doublet of $$Gamma_5$$ above 49 K from the quantitative analysis of the magnetic susceptibility and the magnetization curve. The $$Gamma_5$$ must contribute to the heavy fermion, since the singlet ground state $$Gamma_1$$ alone cannot, where 2-channel Kondo effect appears based on $$Gamma_5$$. The low-temperature specific heat of NpPd$$_5$$Al$$_2$$ can be explained with the superposition of the heavy fermion state and localized Schottky anomaly, where the total entropy was maintained $$R$$ln3 for pseudo-triplet state. The $$LS$$-coupling scheme of AnPd$$_5$$Al$$_2$$ can be described by the corresponding $$j$$-$$j$$ coupling scheme, where Pu and Np are the hole version of Ce and Pr. The $$Gamma_1$$ in NpPd$$_5$$Al$$_2$$ is stabilized with the same mechanism as in PrT$$_2$$X$$_{20}$$, both exhibit the unconventional superconductivity.

9 (Records 1-9 displayed on this page)
  • 1