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Journal Articles

$$mu^+$$ diffusion in cubic $$f$$-electron compounds observed by high transverse field $$mu^+$$SR

Ito, Takashi; Higemoto, Wataru; Oishi, Kazuki*; Nishida, Nobuhiko*; Heffner, R. H.; Aoki, Yuji*; Suzuki, Hiroyuki*; Onimaru, Takahiro*; Tanida, Hiroshi*; Takagi, Shigeru*

Journal of Physics; Conference Series, 225, p.012021_1 - 012021_6, 2010/06

https://doi.org/10.1088/1742-6596/225/1/012021
 Times Cited Count：2 Percentile：66.93(Physics, Applied)

The diffusion of positive muon $$mu^+$$ in condensed matter has been investigated for many years by using $$mu^+$$ spin rotation/relaxation ($$mu^+$$SR) technique. The $$mu^+$$SR studies have provided deep insight into quantum diffusion at low temperatures as well as hopping process at high temperatures, which are closely related to hydrogen dynamics in the dilute limit. We here report transverse field (TF) $$mu^+$$SR studies of the $$mu^+$$ diffusion in cubic $$f$$-electron compounds PrPb$$_3$$ and SmAg$$_2$$In. The $$mu^+$$ site splits into two magnetically labeled sites when high TF is applied to single-crystalline specimens along the [001] direction. The $$mu^+$$SR lines show drastic variation according to the $$mu^+$$ motion between the magnetically labeled sites. From detailed analysis of the $$mu^+$$SR lines, we deduced $$mu^+$$ hopping parameters for both compounds.

Journal Articles

Growth and characterization of bismuth magnesium titanate Bi(Mg$$_{1/2}$$Ti$$_{1/2}$$)0$$_3$$

Yoneda, Yasuhiro; Saito, Hiroyuki; Yoshii, Kenji; Nishida, Takashi*; Hayakawa, Hironori*; Ikeda, Naoshi*

Key Engineering Materials, 421-422, p.30 - 33, 2010/00

Polycrystalline Bi(Mg$$_{1/2}$$Ti$$_{1/2}$$)O$$_3$$ samples were prepared under high pressure. A mixed powder of Bi$$_2$$O$$_3$$, Ti$$_2$$O$$_3$$ and MgO with a prescribed ratio was packed into platinum cell and was heated a cubic anvil-type apparatus at 6.5 GPa and 1000 $$^circ$$C. The obtained samples were characterized by powder X-ray diffraction measurements. Although some impurity peaks existed, the main peaks were perovskite peaks. The structure of Bi(Mg$$_{1/2}$$Ti$$_{1/2}$$)O$$_3$$ is rhombohedral, as well as BiFeO$$_3$$. The D-E hysteresis loop was not saturated due to the impurities, but the possibility as ferroelectric can be expected enough.

Journal Articles

Possible low-energy excitations of multipoles in SmRu$$_4$$P$$_{12}$$ probed by muon spin relaxation

Ito, Takashi; Higemoto, Wataru; Oishi, Kazuki*; Heffner, R. H.; Nishida, Nobuhiko*; Sato, Kazuhiko*; Sugawara, Hitoshi*; Aoki, Yuji*; Kikuchi, Daisuke*; Sato, Hideyuki*

Physica B; Condensed Matter, 404(5-7), p.761 - 764, 2009/04

https://doi.org/10.1016/j.physb.2008.11.179
 Times Cited Count：1 Percentile：6.09(Physics, Condensed Matter)

We report on detailed longitudinal field (LF) $$mu$$SR studies in SmRu$$_4$$P$$_{12}$$ in order to characterize magnetic fluctuations in a magnetically ordered state below $$T_{rm MI}=16.5$$ K. A magnitude and fluctuation rate of the fluctuating field are derived as functions of temperature from LF dependence of the longitudinal relaxation rate. Possible low-energy excitations of magnetic multipoles are discussed.

Journal Articles

Novel features in filled skutterudites containing rare-earth elements with a plural number of 4f-electrons

Sato, Hideyuki*; Aoki, Yuji*; Kikuchi, Daisuke*; Sugawara, Hitoshi*; Higemoto, Wataru; Oishi, Kazuki; Ito, Takashi; Heffner, R. H.; Saha, S. R.*; Koda, Akihiro*; et al.

Physica B; Condensed Matter, 404(5-7), p.749 - 753, 2009/04

https://doi.org/10.1016/j.physb.2008.11.182
 Times Cited Count：5 Percentile：25.59(Physics, Condensed Matter)

Wide varieties of strongly correlated electron phenomena are performed on the stage of a filled skutterudite structure. Especially when one of the players contains a plural number of 4f electrons, the orbital degrees of freedom play a major role as a new type of nonmagnetic and/or weak-magnetic phenomena. Several examples found in Pr- and Sm-based filled skutterudites are introduced in relation to muon spin relaxation experiments.

Journal Articles

Quantized hyperfine field at an implanted $$mu^+$$ site in PrPb$$_3$$; Interplay between localized $$f$$ electrons and an interstitial charged particle

Ito, Takashi; Higemoto, Wataru; Oishi, Kazuki*; Nishida, Nobuhiko*; Heffner, R. H.; Aoki, Yuji*; Amato, A.*; Onimaru, Takahiro*; Suzuki, Hiroyuki*

Physical Review Letters, 102(9), p.096403_1 - 096403_4, 2009/03

https://doi.org/10.1103/PhysRevLett.102.096403
 Times Cited Count：14 Percentile：62.72(Physics, Multidisciplinary)

Journal Articles

Magnetic properties of SmRu$$_{4}$$P$$_{12}$$ probed by $$mu$$SR

Ito, Takashi; Higemoto, Wataru; Oishi, Kazuki; Heffner, R. H.; Nishida, Nobuhiko*; Sato, Kazuhiko*; Sugawara, Hitoshi*; Aoki, Yuji*; Kikuchi, Daisuke*; Sato, Hideyuki*

Journal of Physics and Chemistry of Solids, 68(11), p.2072 - 2075, 2007/11

https://doi.org/10.1016/j.jpcs.2007.08.029
 Times Cited Count：1 Percentile：7.46(Chemistry, Multidisciplinary)

no abstracts in English

Journal Articles

Evolution of local magnetic state in SmRu$$_4$$P$$_{12}$$ probed by muon spin relaxation

Ito, Takashi; Higemoto, Wataru; Oishi, Kazuki; Fujimoto, Tatsuya*; Heffner, R. H.; Nishida, Nobuhiko*; Sato, Kazuhiko*; Sugawara, Hitoshi*; Aoki, Yuji*; Kikuchi, Daisuke*; et al.

Journal of the Physical Society of Japan, 76(5), p.053707_1 - 053707_4, 2007/05

https://doi.org/10.1143/JPSJ.76.053707
 Times Cited Count：27 Percentile：74.93(Physics, Multidisciplinary)

A filled skutterudite compound SmRu$$_4$$P$$_{12}$$ shows metal-insulatortransition at $$T_{rm MI}$$=16.5K with magnetic anomaly. A possibility of magnetic octupole ordering has been discussed on the basis of multipole degrees of freedom belonging to thecrystalline-electric-field ground state. We investigated local magnetic states in the ordered state by using the muon spin relaxation method. An increase of muon spin relaxation rate was detected in zeroapplied field just below $$T_{rm MI}$$, indicating time-reversal-symmetry breaking in the ordered state. This result suggests that the order parameter includes magnetic octupole and/ordipole. Magnitude of the internal field at the muon site monotonically increases with decreasing temperature, growing steeply below $$T^{prime}$$=3K. The longitudinal relaxation rate has a maximum at around $$T^{prime}$$, suggesting suppression of magnetic fluctuations. We discussed these experimental facts on the basis of the multipoledegrees of freedom.

Journal Articles

Muon knight shift measurements on PrPb$$_3$$ in paraquadrupolar state

Ito, Takashi; Higemoto, Wataru; Oishi, Kazuki; Heffner, R. H.; Nishida, Nobuhiko*; Aoki, Yuji*; Onimaru, Takahiro*; Suzuki, Hiroyuki*

Journal of Magnetism and Magnetic Materials, 310(2, Part1), p.743 - 745, 2007/03

PrPb$$_3$$ exhibits antiferroquadrupole ordering at T$$_Q$$ = 0.4 K. In the ordering phase, incommensurate structure of quadruple was found from recent experimental study and much attention is paid to this compound. We performed muon spin rotation and relaxation measurements on a single crystalline sample of PrPb$$_3$$. A quite anisotropic contact-coupling constant was extracted from the muon Knight shift, possibly concerned with nonspherical distribution of 4$$f$$-electron at low temperature. The contact and dipole coupling constants are of comparable magnitudes, suggesting significance of strong hybridization between the $$4f$$ electrons of Pr and the conduction electrons for incommensurate structure.

Journal Articles

Investigation of bulk superconductivity in PrPt$$_5$$

Ito, Takashi; Nishida, Nobuhiko*; Oishi, Kazuki; Higemoto, Wataru; Karaki, Yoshitomo*; Ishimoto, Hidehiko*

Journal of the Physical Society of Japan, 75(Suppl.), p.189 - 191, 2006/08

no abstracts in English

Journal Articles

ProVISION

; Sakakibara, Yasuhide; Nishida, Masaaki; kondou; Nagata, Takashi

ProVISION, Fall(39), p.30 - 37, 2003/00

None

Journal Articles

Superconductivity of M$$_{I}$$(M$$_{II}$$$$_{0.5}$$,Si$$_{0.5}$$)$$_{2}$$ (M$$_{I}$$=Sr and Ba, M$$_{II}$$=Al and Ga), ternary silicides with the AlB$$_{2}$$-type structure

Imai, Motoharu*; Nishida, Kenji*; Kimura, Takashi*; Kitazawa, Hideaki*; Abe, Hideki*; Kito, Hijiri*; Yoshii, Kenji

Physica C, 382(4), p.361 - 366, 2002/11

https://doi.org/10.1016/S0921-4534(02)01798-7
 Times Cited Count：57 Percentile：88.53(Physics, Applied)

no abstracts in English

JAEA Reports

A study on in-situ measuring method and modeling technique of an unsaturated zone

Imai, Hisashi; Amemiya, Kiyoshi*; Kato, Takashi*; Nishida, Kaoru*; Arakawa, Tetsuichi*; Maemura, Tsuneyuki*

JNC TJ7400 99-009, 318 Pages, 1999/02

JNC-TJ7400-99-009.pdf:15.91MB

None

Journal Articles

Performance study of the cryogenic system for ITER CS model coil

Kato, Takashi; Hamada, Kazuya; Kawano, Katsumi; Matsui, Kunihiro; Hiyama, Tadao; Nishida, Kazuhiko*; Honda, Tadaaki*; Taneda, Masanobu*; Sekiguchi, Shuichi*; Otsu, Kiichi*; et al.

ICEC16/ICMC Proceedings, p.127 - 130, 1996/00

no abstracts in English

Oral presentation

$$mu$$SR study on multipolar ordering in PrPb$$_3$$, 2

Ito, Takashi; Higemoto, Wataru; Oishi, Kazuki; Heffner, R. H.; Nishida, Nobuhiko*; Aoki, Yuji*; Onimaru, Takahiro*; Suzuki, Hiroyuki*

no journal, , 

no abstracts in English

Oral presentation

Magnetism of SmRu$$_4$$P$$_{12}$$ at low temperature and low field probed by $$mu$$SR

Ito, Takashi; Higemoto, Wataru; Oishi, Kazuki; Fujimoto, Tatsuya; Heffner, R. H.; Nishida, Nobuhiko*; Sato, Kazuhiko*; Sugawara, Hitoshi*; Aoki, Yuji*; Kikuchi, Daisuke*; et al.

no journal, , 

no abstracts in English

Oral presentation

Anomalous magnetic state in SmRu$$_4$$P$$_{12}$$ detected by muon spin relaxation

Ito, Takashi; Higemoto, Wataru; Oishi, Kazuki; Fujimoto, Tatsuya; Heffner, R. H.; Nishida, Nobuhiko*; Sato, Kazuhiko*; Sugawara, Hitoshi*; Aoki, Yuji*; Kikuchi, Daisuke*; et al.

no journal, , 

no abstracts in English

Oral presentation

Study of static and dynamic properties of multipoles in $$f$$ electron systems

Ito, Takashi; Higemoto, Wataru; Oishi, Kazuki; Fujimoto, Tatsuya; Heffner, R. H.; Nishida, Nobuhiko*; Sato, Kazuhiko*; Sugawara, Hitoshi*; Aoki, Yuji*; Kikuchi, Daisuke*; et al.

no journal, , 

no abstracts in English

Oral presentation

Magnetism of SmRu$$_4$$P$$_{12}$$ at low temperature and low field probed by $$mu$$SR

Ito, Takashi; Higemoto, Wataru; Oishi, Kazuki; Fujimoto, Tatsuya; Heffner, R. H.; Nishida, Nobuhiko*; Sato, Kazuhiko*; Sugawara, Hitoshi*; Aoki, Yuji*; Kikuchi, Daisuke*; et al.

no journal, , 

no abstracts in English

Oral presentation

Hyperfine-enhanced nuclear magnetism in $$^{141}$$Pr-based compounds observed by muon spin relaxation

Ito, Takashi; Higemoto, Wataru; Oishi, Kazuki; Nishida, Nobuhiko*; Karaki, Yoshitomo*; Ishimoto, Hidehiko*

no journal, , 

Several novel phenomena about higher order multipoles have recently been found in $$^{141}$$Pr-based compounds with a nonmagnetic crystalline-electric-field (CEF) ground state. Previous $$mu$$SR studies in such compounds reported an anomalous muon spin relaxation at low temperatures in spite of the CEF ground state with the nonmagnetic nature, and a hyperfine-enhanced nuclear magnetism was discussed as the origin. A Van-Vleck paramagnet PrPt$$_5$$ is a typical system of the enhanced nuclear magnetism, which exhibits a ferromagnetic nuclear ordering at $$T_c$$=1.7 mK. This compound has been well characterized and is an ideal system to clarify a relation between the enhanced nuclear magnetism and the anomalous muon spin relaxation in $$^{141}$$Pr-based compounds. We performed $$mu$$SR measurements down to 50 mK. An internal field observed at the muon site is much larger in magnitude than ones due to bare nuclear dipole moments, suggesting an induction of 4$$f$$ magnetic moments. A fluctuation rate $$nu$$ of the field was estimated in the order of a few MHz and the value for $$nu$$ is consistent with one estimated from $$T_c$$. Our observations demonstrate that the $$mu$$SR is an ideal tool to investigate the dynamics of the hyperfine-enhanced nuclear spins in $$f$$ electron systems.

Oral presentation

Possible multipole state of SmRu$$_4$$P$$_{12}$$ probed by $$mu$$SR

Ito, Takashi; Higemoto, Wataru; Oishi, Kazuki*; Heffner, R. H.; Nishida, Nobuhiko*; Sato, Kazuhiko*; Sugawara, Hitoshi*; Aoki, Yuji*; Kikuchi, Daisuke*; Sato, Hideyuki*

no journal, , 

The filled skutterudite compound SmRu$$_4$$P$$_{12}$$ exhibits a metal-insulator (MI) transition at $$T_{rm MI}$$ $$sim$$ 16.5 K. An entropy release $$sim Rln4$$ below $$T_{rm MI}$$ suggests that the crystalline-electric-field ground state is a $$Gamma_{67}$$ quartet with various multipole degrees of freedom. A possibility of magnetic octupole ordering has been intensively discussed to explain the time-reversal-symmetry breaking, anomalous elastic properties, and a complex field-temperature phase diagram. We will report $$mu$$SR measurements on single crystalline samples of SmRu$$_4$$P$$_{12}$$ to investigate the nature of the multipoles in the ordered state. A remarkable longitudinal relaxation was observed in the ordered state, the magnitude of which was reduced below $$T^{prime}$$ $$sim$$ 3 K. We will discuss possible low-energy excitations of magnetic multipoles in the ordered state and their influence on the local magnetic probe on the basis of symmetry of the multipoles.

27 (Records 1-20 displayed on this page)