Refine your search:     
Report No.
 - 
Search Results: Records 1-19 displayed on this page of 19
  • 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

T-dependent nuclear hyperfine coupling at the In site in CeIrIn$$_{5}$$

Kambe, Shinsaku; Sakai, Hironori; Tokunaga, Yo; Matsuda, Tatsuma; Haga, Yoshinori; Takeuchi, Tetsuya*; Onuki, Yoshichika*; Walstedt, R. E.*

Journal of the Physical Society of Japan, 80(Suppl.A), p.SA009_1 - SA009_3, 2011/07

We report an $$^{115}$$In NMR study of a single-crystal sample of the heavy fermion superconductor CeIrIn$$_5$$. The observed non-linear variation of Knight Shift with static susceptibility in the normal state is consistent with the two-fluid (components) model of Nakatsuji et al, indicating that two individual contributions to static susceptibility exist. However, our results can also be understood in terms of a T-dependent hyperfine coupling, which accounts for the spin-lattice relaxation data naturally on the basis of a one-component dynamical susceptibility. In addition, the observed T-dependence of the hyperfine coupling is scaled to a density of states given by dynamical mean field theory (DMFT). We believe that this contrast between the static and dynamical properties is a crucial dual nature of the heavy fermion crossover, which related with the coherence between localized and itinerant excitations.

Journal Articles

Multipole correlations of $$t_{rm 2g}$$-orbital Hubbard model with spin-orbit coupling

Onishi, Hiroaki

Journal of the Physical Society of Japan, 80(Suppl.A), p.SA141_1 - SA141_3, 2011/07

 Times Cited Count:2 Percentile:77.61(Physics, Multidisciplinary)

Journal Articles

NMR study on AmO$$_{2}$$; Comparison with UO$$_{2}$$ and NpO$$_{2}$$

Tokunaga, Yo; Nishi, Tsuyoshi; Kambe, Shinsaku; Nakada, Masami; Homma, Yoshiya*; Sakai, Hironori; Chudo, Hiroyuki

Journal of the Physical Society of Japan, 80(Suppl.A), p.SA110_1 - SA110_3, 2011/07

 Times Cited Count:2 Percentile:77.61(Physics, Multidisciplinary)

We have successfully performed an $$^{17}$$O NMR for the first time on Americium dioxide (AmO$$_2$$). We observed a drastic broadening of the NMR spectrum, after a sudden drop of NMR signal intensity below $$T_0$$. These data provide the first microscopic evidence for a phase transition as a bulk property in this system. In the ordered state, we found a spectrum with a triangular line shape, which resembles neither that of UO$$_2$$ nor NpO$$_2$$. It is also suggested that there is considerable damage to the sample induced by self-radiation effects from the alpha decay of $$^{243}$$Am.

Journal Articles

Dilute La-substitutions in CeRhIn$$_5$$ studied by means of NMR/NQR techniques

Sakai, Hironori; Kurita, Nobuyuki*; Miclea, C. F.*; Movshovich, R.*; Lee, H.-O.*; Ronning, F.*; Bauer, E. D.*; Thompson, J. D.*

Journal of the Physical Society of Japan, 80(Suppl.A), p.SA059_1 - SA059_3, 2011/07

The effect of dilute La substitution in Ce$$_{1-x}$$La$$_{x}$$RhIn$$_{5}$$ (0$$le$$x$$le$$0.07) has been investigated microscopically by nuclear magnetic/quadrupole resonance (NMR/NQR). By the dilute La substitutions, the 4$$nu_{rm Q}$$ lines for In(1) sites are found to be undisturbed and to have a reasonably narrow width, even in the ordered AF state. These 4$$nu_{rm Q}$$ positions in the La-substituted CeRhIn$$_{5}$$ indicate a decrease of the internal field on In(1) sites, due to the reduction of hyperfine couplings by La substitutions. The spin-lattice relaxation rates ($$1/T_{1}$$) using these 4$$nu_{rm Q}$$ lines at high temperatures can be understood by the reduction of exchange energy and effective moments. On the other hand, $$1/T_{1}$$ in the AF ordered state can be explained by a gapped Fermi surface and spin fluctuations of uncompensated localized Ce moments near the La ions.

Journal Articles

Correlation effects on antiferromagnetism in Fe pnictides

Kubo, Katsunori; Thalmeier, P.*

Journal of the Physical Society of Japan, 80(Suppl.A), p.SA121_1 - SA121_3, 2011/07

 Times Cited Count:7 Percentile:48.39(Physics, Multidisciplinary)

Journal Articles

Non-magnetic to magnetic transition under high pressure in narrow-gap semiconductor $$beta$$-US$$_2$$

Tateiwa, Naoyuki; Haga, Yoshinori; Sakai, Hironori; Ikeda, Shugo*; Matsuda, Tatsuma; Yamamoto, Etsuji; Onuki, Yoshichika*

Journal of the Physical Society of Japan, 80(Suppl.A), p.SA103_1 - SA103_3, 2011/07

 Times Cited Count:2 Percentile:77.61(Physics, Multidisciplinary)

We have measured the magnetization of an uranium chalcogenide compound $$beta$$-US$$_2$$ under high pressure by piston cylinder and indenter type cells up to 2.42 GPa in a commercial SQUID magnetometer. The compound is a narrow-gap semiconductor that does not order magnetically down to 0.3 K at 1 bar. In this study, it was found that a ferromagnetic state is induced above 1 GPa. The pressure phase diagram were obtained. The values of the spontaneous magnetic moment at 0 K are less than 0.1 $${mu}_{rm B}/{rm U}$$, suggesting that the pressure-induced phase is a very weak ferromagnetic state. Considering the CEF singlet ground state in $$beta$$-US$$_2$$, it is suggest that the ferromagnetic state is an "induced-magnetic phase" often observed in some praseodymium compounds such as Pr$$_3$$Tl. The experimental results are discussed in terms of the mean field theory.

Journal Articles

Specific heat and magnetization studies of the superconducting mixed state of UBe$$_{13}$$

Shimizu, Yusei*; Ikeda, Yoichi*; Wakabayashi, Takumi*; Tenya, Kenichi*; Haga, Yoshinori; Hidaka, Hiroyuki*; Yanagisawa, Tatsuya*; Amitsuka, Hiroshi*

Journal of the Physical Society of Japan, 80(Suppl.A), p.SA100_1 - SA100_3, 2011/07

 Times Cited Count:1 Percentile:87.43(Physics, Multidisciplinary)

Journal Articles

Ultrasonic measurements on the cage-structured clathrate compound U$$_3$$Pd$$_{20}$$Si$$_6$$

Yanagisawa, Tatsuya*; Tateiwa, Naoyuki; Mayama, Taichi*; Saito, Hitoshi*; Hidaka, Hiroyuki*; Amitsuka, Hiroshi*; Haga, Yoshinori; Nemoto, Yuichi*; Goto, Terutaka*

Journal of the Physical Society of Japan, 80(Suppl.A), p.SA105_1 - SA105_3, 2011/07

 Times Cited Count:3 Percentile:69.39(Physics, Multidisciplinary)

Journal Articles

Crystal structure and physical properties of trigonal NpGa$$_3$$ and Np$$_{3}$$Ga$$_{11}$$

Haga, Yoshinori; Aoki, Dai*; Homma, Yoshiya*; Matsuda, Tatsuma; Ikeda, Shugo*; Sakai, Hironori; Yamamoto, Etsuji; Nakamura, Akio; Shiokawa, Yoshinobu*; Onuki, Yoshichika

Journal of the Physical Society of Japan, 80(Suppl.A), p.SA109_1 - SA109_3, 2011/07

 Times Cited Count:0 Percentile:100(Physics, Multidisciplinary)

Journal Articles

Detailed characterization of U-Co binary compounds

Matsuda, Tatsuma; Sugai, Takashi; Haga, Yoshinori; Yamamoto, Etsuji; Onuki, Yoshichika

Journal of the Physical Society of Japan, 80(Suppl.A), p.SA101_1 - SA101_3, 2011/07

Journal Articles

Resonant angle-resolved photoelectron spectroscopy of substitutional solid solutions of CeRu$$_2$$Si$$_2$$

Okane, Tetsuo; Kawasaki, Ikuto; Yasui, Akira; Okochi, Takuo*; Takeda, Yukiharu; Fujimori, Shinichi; Saito, Yuji; Yamagami, Hiroshi; Fujimori, Atsushi; Matsumoto, Yuji*; et al.

Journal of the Physical Society of Japan, 80(Suppl.A), p.SA060_1 - SA060_3, 2011/07

 Times Cited Count:1 Percentile:87.43(Physics, Multidisciplinary)

Journal Articles

Possible long-periodic magnetic structure in SmPb$$_{3}$$

Ito, Takashi; Higemoto, Wataru; Ninomiya, Kazuhiko; Amato, A.*; Sugai, Takashi; Haga, Yoshinori; Suzuki, Hiroyuki*

Journal of the Physical Society of Japan, 80(Suppl.A), p.SA075_1 - SA075_3, 2011/07

A series of cubic SmX$$_3$$ (X=In, Sn, Pb) compounds has a $$Gamma_8$$ crystalline-electric-field ground state with various multipolar degrees of freedom. These show phase transitions at low temperatures and a possibility of multipolar ordering has been suggested. However, no microscopic experimental data is available so far and details of the ordered states have not been clarified yet. We performed muon spin relaxation measurements in order to elucidate nature of multipoles in these systems. A breaking of time-reversal symmetry was observed in all the ordered phases in zero applied field, indicating the primary order parameters are magnetic. We also obtained information about the ordered structures from a microscopic point of view.

Journal Articles

$$^9$$Be-NMR spin-lattice relaxation rate in heavy-fermion superconductor UBe$$_{13}$$

Morita, Kyohei*; Hara, Yudai*; Sakano, Junya*; Kotegawa, Hisashi*; To, Hideki*; Haga, Yoshinori; Onuki, Yoshichika

Journal of the Physical Society of Japan, 80(Suppl.A), p.SA099_1 - SA099_3, 2011/07

 Times Cited Count:1 Percentile:87.43(Physics, Multidisciplinary)

Journal Articles

Magnetic-field-induced metallic state in $$beta$$-US$$_2$$

Sugiyama, Kiyohiro*; Hirose, Yusuke*; Enoki, Kentaro*; Ikeda, Shugo*; Yamamoto, Etsuji; Tateiwa, Naoyuki; Haga, Yoshinori; Kida, Takanori*; Hagiwara, Masayuki*; Kindo, Koichi*; et al.

Journal of the Physical Society of Japan, 80(Suppl.A), p.SA104_1 - SA104_3, 2011/07

 Times Cited Count:1 Percentile:87.43(Physics, Multidisciplinary)

Oral presentation

Resonant X-ray diffraction study on the charge ordering transitions in the mixed valent compound EuPtP

Inami, Toshiya; Michimura, Shinji; Mitsuda, Akihiro*; Wada, Hirofumi*

no journal, , 

Oral presentation

Temperature dependence of soft X-ray photoemission spectra for YbCu$$_2$$Si$$_2$$

Yasui, Akira; Fujimori, Shinichi; Kawasaki, Ikuto; Okane, Tetsuo; Takeda, Yukiharu; Saito, Yuji; Yamagami, Hiroshi; Sekiyama, Akira*; Settai, Rikio*; Matsuda, Tatsuma; et al.

no journal, , 

YbCu$$_2$$Si$$_2$$ is one of valence fluctuating compounds. Though there are a few temperature ($$T$$)-dependent photoemission spectroscopy (PES) measurements for YbCu$$_2$$Si$$_2$$, there are different interpretations of the obtained spectra with each other. The previous studies were performed by using the vacuum ultraviolet (VUV) radiation. The VUV-PES spectra have considerably large contribution of the surface state. In order to examine the bulk electronic state in detail, it is needed to suppress the surface contribution. The soft X-ray PES (SX-PES) is a powerful tool to investigate the bulk electronic state. The SX-PES measurements were performed at BL23SU in SPring-8. In our SX-PES spectra, the surface Yb$$^{2+}$$ 4$$f$$ contribution is very small. With increasing $$T$$, the bulk Yb$$^{2+}$$ 4$$f$$ peaks shift toward the higher energy side, while the Yb$$^{3+}$$ multiplets do not move. Since the energy shift cannot be explained in the single impurity Anderson model, the experimental results indicate the Kondo lattice effects play important roles for YbCu$$_2$$Si$$_2$$.

Oral presentation

Intermediate valence quasicrystals in Yb-based alloys under pressure

Watanuki, Tetsu; Kawana, Daichi*; Machida, Akihiko; Tsai, A. P.*

no journal, , 

Oral presentation

Resonant X-ray diffraction study of multipole ordering in CePd$$_3$$S$$_4$$

Michimura, Shinji; Inami, Toshiya; Matsuoka, Eiichi*; Watahiki, Masanori*; Onodera, Hideya*

no journal, , 

Oral presentation

Neutron scattering study on rattling in filled-skutterudite compounds

Kaneko, Koji; Matsuda, Tatsuma; Kimura, Hiroyuki*; Noda, Yukio; Metoki, Naoto; Momma, Koichi*; Izumi, Fujio*

no journal, , 

19 (Records 1-19 displayed on this page)
  • 1