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Search Results: Records 1-20 displayed on this page of 82

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Oral presentation

Formation of heavy fermion state in USn$$_3$$

Kambe, Shinsaku; Sakai, Hironori; Tokunaga, Yo; Matsuda, Tatsuma; Haga, Yoshinori; Chudo, Hiroyuki

no journal, , 

In order to characterize the heavy fermion formation in USn$$_3$$, Knight shift and spin-lattice relaxation time $$T_1$$ of $$^{119}$$Sn NMR are measured. Dynamical property ($$T_1$$) and static property (the specific heat) at the heavy fermion state can be described in a quantitatively consistent way based on the spin-fluctuation model with constant energy scales. However, an introduction of $$T$$-dependent effective RKKY interaction is necessary to describe the crossover from the incoherent localized to the coherent heavy fermion states.

Oral presentation

Resonant magnetic X-ray diffraction experiment on GdPd$$_2$$Al$$_3$$

Inami, Toshiya; Terada, Noriki*; Kitazawa, Hideaki*

no journal, , 

no abstracts in English

Oral presentation

Sub-MeV X-ray production with laser Compton backscattering

Kawase, Keigo; Kando, Masaki; Hayakawa, Takehito; Daito, Izuru; Kondo, Shuji; Homma, Takayuki; Kameshima, Takashi; Kotaki, Hideyuki; Chen, L. M.; Fukuda, Yuji; et al.

no journal, , 

We start a study of the Compton backscattered X-ray generation with the Nd:YAG laser photons and the 150 MeV electron beam from the microtron accelerator at KPSI-JAEA. The maximum energy of the generated X-ray is estimated to 400 keV. We report the present status and the future prospects of this study at the meeting.

Oral presentation

Inelastic scattering process in reflection high-energy positron diffraction

Fukaya, Yuki; Hashimoto, Mie; Kawasuso, Atsuo; Ichimiya, Ayahiko

no journal, , 

no abstracts in English

Oral presentation

Magnetism in CeCo(In,Cd)$$_5$$ probed by $$mu$$SR

Oishi, Kazuki; Heffner, R. H.; MacDougall, G. J.*; Ito, Takashi; Higemoto, Wataru; Luke, G. M.*; Amato, A.*; Nieuwenhuys, G.*; Spehling, J.*; Klauss, H. H.*; et al.

no journal, , 

no abstracts in English

Oral presentation

Developments for 2 and 3 dimensional elemental prompt $$gamma$$-ray analysis using thermal neutron beam

Segawa, Mariko; Matsue, Hideaki; Yamada, Satoru*; Shinohara, Takenao; Sasao, Hajime*; Suzuki, Junichi; Shimizu, Hirohiko*

no journal, , 

Since the penetration probability of neutron is higher than that of charged particles, the 2 and 3 dimensional prompt $$gamma$$-ray analysis methods with use of neutron beam is the only way enables the nondestructive, isotopic and position dependent observation on small quantities of samples. We constructed the 2 and 3 dimensional prompt $$gamma$$-ray analysis(2 and 3 DPGA)systems with a high position resolution using focused neutron beam in Prompt $$gamma$$-ray Analysis system(PGA) at JAEA. Using this developed system including the HP Ge-detector, we succeeded in dividing the two neutron captured $$gamma$$-ray peaks from two minute Cd wired-samples, the diameter is 0.25 mm$$phi$$ and the length is 5 mm, sideways arranged at intervals of 1mm.

Oral presentation

Magnetic and dielectric properties of R$$_{0.5}$$Ca$$_{0.5}$$MnO$$_{3}$$ (R: rare earths)

Yoshii, Kenji; Hiramitsu, Yusuke*; Okajima, Yuka; Yoneda, Yasuhiro; Nishihata, Yasuo; Mizuki, Junichiro; Ikeda, Naoshi*

no journal, , 

no abstracts in English

Oral presentation

Identification of electron-induced defects in ZnO

Kawasuso, Atsuo; Chen, Z. Q.*; Maekawa, Masaki; Betsuyaku, Kiyoshi*

no journal, , 

no abstracts in English

Oral presentation

Transport properties of unique neptunium superconductor NpPd$$_5$$Al$$_2$$

Matsuda, Tatsuma; Haga, Yoshinori; Aoki, Dai*; Ikeda, Shugo; Tateiwa, Naoyuki; Homma, Yoshiya*; Shiokawa, Yoshinobu*; Settai, Rikio*; Onuki, Yoshichika

no journal, , 

no abstracts in English

Oral presentation

Metal-insulator transition of In/Si(111) surface studied by reflection high-energy positron diffraction

Hashimoto, Mie; Fukaya, Yuki; Kawasuso, Atsuo; Ichimiya, Ayahiko

no journal, , 

no abstracts in English

Oral presentation

Hume-Rothery-type electron compound formed in a single-atomic layer of metal alloy

Matsuda, Iwao*; Fukaya, Yuki; Hashimoto, Mie; Narita, Hisashi*; Kawasuso, Atsuo; Ichimiya, Ayahiko

no journal, , 

no abstracts in English

Oral presentation

Masses of unstable nuclei and the equation of state of asymmetric nuclear matter, 3

Oyamatsu, Kazuhiro*; Iida, Kei*; Koura, Hiroyuki

no journal, , 

no abstracts in English

Oral presentation

Structure of liquid metal hydride

Katayama, Yoshinori; Saito, Hiroyuki; Aoki, Katsutoshi

no journal, , 

It is known that several metals absorb large amount of hydrogen. Although there are many studies in the solid state, little is known about the structure of metal hydrides in the liquid state. Fukai has suggested the existence of liquid metal hydrides which contains large amount of hydrogen in the liquid state under high hydrogen pressure. To confirm the existence of liquid metal hydride, we have carried out high-pressure high-temperature X-ray diffraction experiments using a cubic-type multi-anvil apparatus installed in BL14B1 in SPring-8. The starting materials is vanadium hydride, V$$_{2}$$H Using a mixture of NaBH$$_{4}$$ and Ca(OH)$$_{2}$$ as hydrogen source, we have observed transformation from V$$_{2}$$H to VH$$_{2}$$ at 5 GPa and 973 K. However, it transforms to VH at higher temperature and solid VH was stable up to melting temperature of NaCl, which is used as a sample container. Experiments on other materials are under way and the results will be reported.

Oral presentation

Spin glass order parameter for the Ising spin glass model on the cactus lattices

Yokota, Terufumi

no journal, , 

Equations for the spin glass order in the Ising spin glass model on the Bethe-like lattices with small loops are studied. Equations are obtained by using and not using the replica method. Within the replica symmetric approximation, equations obtained by the two ways are shown to be identical. To see the effects of the small loops and the replica symmetry breaking, a spin glass order parameter is investigated.

Oral presentation

Phase transition of BiFeO$$_3$$ seen from local structure

Yoneda, Yasuhiro; Yoshii, Kenji; Kohara, Shinji*

no journal, , 

Local structures of BaTiO$$_3$$ and BiFeO$$_3$$ perovskite ferroelectrics were investigated by X-ray pair-distribution function (PDF) analysis in wide temperature ranges. In BaTiO$$_3$$, the high-temperature cubic structure deformed to rhombohedral structure through three phase transitions. On the other hand, in BiFeO$$_3$$ the high-temperature cubicstructure deformed to the rhombohedral structure through only one phase transition. The temperature evolution of the PDFs for BaTiO$$_3$$ and BiFeO$$_3$$ was corrected. In BaTiO$$_3$$, the positions of the PDF peaks did not change too much excluding the temperature factor. In BiFeO$$_3$$ the shapes of PDF peaks changed drastically at the phase transition temperature. Thus, we found two types of phase transitions in ferroelectrics. In one, the average structure changed, but local structure unchanged like BaTiO$$_3$$. Another is that both average and local structure changed like BiFeO$$_3$$.

Oral presentation

Two-step spin flop transition in spin ladder systems

Sakai, Toru; Okamoto, Kiyomi*

no journal, , 

Based on the numerical exact siagonalization analysis, we theoretically revealed that the spin flop transition appears as a two-step second-order transition in the spin ladder systems with ferromagnetic rung interactions. The mechanism of the two-step field-induced transition observed in the material IPA-CuCl$$_{3}$$ will be also mentioned.

Oral presentation

Study of the configuration and performance of crystal analyzer on near-backscattering TOF spectrometer DNA

Shibata, Kaoru; Takahashi, Nobuaki; Kawakita, Yukinobu*; Sato, Taku*; Tsukushi, Itaru*; Metoki, Naoto; Mamontov, E.*; Nakajima, Kenji; Arai, Masatoshi

no journal, , 

no abstracts in English

Oral presentation

Magnetism of YbCo$$_2$$Zn$$_{20}$$ probed by muon spin relaxation

Higemoto, Wataru; Ito, Takashi; Oishi, Kazuki; Sato, Kazuhiko*; Saiga, Yuta*; Kosaka, Masashi*; Matsubayashi, Kazuyuki*; Uwatoko, Yoshiya*

no journal, , 

A heavy fermion compound YbCo$$_2$$Zn$$_{20}$$ possess quite large electronic specific heat coefficient at low temperature. We have carried out muon spin relaxation measurement to clarify a magnetic ground state. No static magnetic ordering was observed down to 20mK. Meanwhile, the fluctuating magnetic field was detected. This fact suggests that the compound is located in the vicinity of the quantum critical point.

Oral presentation

Irradiation damage in CeO$$_{2}$$ irradiated with high-energy ions

Ohara, Kota; Ishikawa, Norito; Sakai, Seiji; Michikami, Osamu*; Ota, Yasuyuki*

no journal, , 

no abstracts in English

Oral presentation

Test beam transport for the IMRT simulation using laser-driven proton beams

Okazaki, Yoshiko; Yamagiwa, Mitsuru

no journal, , 

no abstracts in English

82 (Records 1-20 displayed on this page)