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Journal Articles

Insight into Kondo screening in the intermediate-valence compound SmOsSb $_{12}$ uncovered by soft X-ray magnetic circular dichroism

Saito, Yuji; Fujiwara, Hidenori*; Yasui, Akira*; Kadono, Toshiharu*; Sugawara, Hitoshi*; Kikuchi, Daisuke*; Sato, Hideyuki*; Suga, Shigemasa*; Yamasaki, Atsushi*; Sekiyama, Akira*; et al.

Physical Review B, 102(16), p.165152_1 - 165152_8, 2020/10

https://doi.org/10.1103/PhysRevB.102.165152

Times Cited Count：1 Percentile：6.04(Materials Science, Multidisciplinary)

Journal Articles

Anharmonic Pr guest modes in Pr(Os $_{1-x}$ Ru)Sb $_{12}$ investigated by inelastic X-ray scattering

Tsutsui, Satoshi; Kaneko, Koji; Miyazaki, Ryoichi*; Higashinaka, Ryuji*; Aoki, Yuji*; Kobayashi, Riki*; Wakimoto, Shuichi; Baron, A. Q. R.*; Sugawara, Hitoshi*; Sato, Hideyuki*

JPS Conference Proceedings (Internet), 3, p.011060_1 - 011060_5, 2014/06

https://doi.org/10.7566/JPSCP.3.011060

Journal Articles

Magnetic-field-induced charge order in the filled skutterudite SmRu $_{4}$ P $_{12}$ ; Evidence from resonant and nonresonant X-ray diffraction

Matsumura, Takeshi*; Michimura, Shinji*; Inami, Toshiya; Hayashi, Yuya*; Fushiya, Kengo*; Matsuda, Tatsuma*; Higashinaka, Ryuji*; Aoki, Yuji*; Sugawara, Hitoshi*

Physical Review B, 89(16), p.161116_1 - 161116_5, 2014/04

https://doi.org/10.1103/PhysRevB.89.161116

Times Cited Count：15 Percentile：54.46(Materials Science, Multidisciplinary)

The antiferromagnetic ordered phase below $T_{rm MI}$ = 16.5 K and the unresolved intermediate phase between $T_{rm MI}$ and (= 14 K) in SmRuP $_{12}$ have been studied by resonant and nonresonant X-ray diffraction. In the intermediate phase, nonresonant Thomson scattering with = (1,0,0) is induced by applying a magnetic field. This phenomena is caused by atomic displacements reflecting the charge order in the band, as predicted theoretically. Simultaneously, the antiferromagnetic moment of Sm is enhanced along the field direction, which is considered to reflect the staggered ordering of the - crystal-field states. The present results show that the orbital-dependent - hybridization in association with the nesting instability in the band gives rise to the unconventional charge order similarly with PrRuP $_{12}$ and PrFeP $_{12}$ .

Journal Articles

Single crystal growth and transport properties of RRu $_{2}$ Al $_{10}$ (R = La and Pr)

Sakoda, Masahito*; Kubota, Kazuhiro*; Tanaka, Shuhei*; Matsuoka, Eiichi*; Sugawara, Hitoshi*; Matsuda, Tatsuma; Haga, Yoshinori

Journal of the Physical Society of Japan, 81(Suppl.B), p.SB011_1 - SB011_4, 2012/12

https://doi.org/10.1143/JPSJS.81SB.SB011

Times Cited Count：2 Percentile：10.8(Physics, Multidisciplinary)

Journal Articles

Magnetic excitation in totally symmetric staggered ordered phase of PrFeP $_{12}$

Iwasa, Kazuaki*; Hao, L.*; Kogi, Masafumi*; Kuwahara, Keitaro*; Mignot, J.-M.*; Sugawara, Hitoshi*; Aoki, Yuji*; Matsuda, Tatsuma; Sato, Hideyuki*

Journal of the Physical Society of Japan, 81(9), p.094711_1 - 094711_9, 2012/09

https://doi.org/10.1143/JPSJ.81.094711

Times Cited Count：9 Percentile：52.9(Physics, Multidisciplinary)

Journal Articles

High field magnetoresistance and de Haas-van Alphen effect in LaRuAl $_{10}$

Sakoda, Masahito*; Tanaka, Shuhei*; Matsuoka, Eiichi*; Sugawara, Hitoshi*; Harima, Hisatomo*; Honda, Fuminori*; Settai, Rikio*; Onuki, Yoshichika; Matsuda, Tatsuma; Haga, Yoshinori

Journal of the Physical Society of Japan, 80(8), p.084716_1 - 084716_5, 2011/08

https://doi.org/10.1143/JPSJ.80.084716

Times Cited Count：8 Percentile：50.77(Physics, Multidisciplinary)

Journal Articles

Suppression of time-reversal symmetry breaking superconductivity in Pr(Os $_{1-x}$ Ru)Sb $_{12}$ and Pr $_{1-y}$ LaOsSb $_{12}$

Shu, L.*; Higemoto, Wataru; Aoki, Yuji*; Hillier, A. D.*; Oishi, Kazuki*; Ishida, Kenji*; Kadono, Ryosuke*; Koda, Akihiro*; Bernal, O. O.*; MacLaughlin, D. E.*; et al.

Physical Review B, 83(10), p.100504_1 - 100504_4, 2011/03

https://doi.org/10.1103/PhysRevB.83.100504

Times Cited Count：34 Percentile：77.76(Materials Science, Multidisciplinary)

Zero-field muon spin relaxation experiments have been carried out in the Pr(Os $_{1-x}$ Ru)Sb $_{12}$ and Pr $_{1-y}$ LaOsSb $_{12}$ alloy systems to investigate broken time-reversal symmetry (TRS) in the superconducting state, signaled by the onset of a spontaneous static local magnetic field B. In both alloy series B initially decreases linearly with solute concentration. Ru doping is considerably more efficient than La doping, with a 50% faster initial decrease. The data suggest that broken TRS is suppressed for Ru concentration 0.6 but persists for essentially all La concentrations. Our data support a crystal-field excitonic cooper pairing mechanism for TRS-breaking superconductivity.

Journal Articles

Possible low-energy excitations of multipoles in SmRuP $_{12}$ 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) SR studies in SmRuP $_{12}$ 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

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

Muon spin relaxation and hyperfine-enhanced $^{141}$ Pr nuclear spin dynamics in Pr(Os,Ru)Sb $_{12}$ and (Pr,La)OsSb $_{12}$

Shu, L.*; MacLaughlin, D. E.*; Aoki, Yuji*; Tsunashima, Yoshino*; Yonezawa, Yuki*; Sanada, Shotaro*; Kikuchi, Daisuke*; Sato, Hideyuki*; Heffner, R. H.; Higemoto, Wataru; et al.

Physical Review B, 76(1), p.014527_1 - 014527_8, 2007/07

https://doi.org/10.1103/PhysRevB.76.014527

Times Cited Count：21 Percentile：64.75(Materials Science, Multidisciplinary)

Journal Articles

The Unconventional superconductivity of skutterudite PrOsSb $_{12}$ ; Time-reversal symmetry breaking and adjacent field-induced quadrupole ordering

Aoki, Yuji*; Tayama, Takashi*; Sakakibara, Toshiro*; Kuwahara, Keitaro*; Iwasa, Kazuaki*; Kogi, Masafumi*; Higemoto, Wataru; MacLaughlin, D. E.*; Sugawara, Hitoshi*; Sato, Hideyuki*

Journal of the Physical Society of Japan, 76(5), p.051006_1 - 051006_13, 2007/05

https://doi.org/10.1143/JPSJ.76.051006

Times Cited Count：63 Percentile：57.04(Physics, Multidisciplinary)

This review presents a summary and evaluation of the experimental properties of unconventional superconductivity in PrOsSb $_{12}$ . After a brief introduction of filled skutterudites, we argue that the normal-state properties of PrOsSb $_{12}$ are quite different from ordinary heavy-fermion superconductors.

Journal Articles

Evolution of local magnetic state in SmRuP $_{12}$ 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 SmRuP $_{12}$ 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

Resonant X-ray scattering of PrRuP $_{12}$

Ishii, Kenji; Tsutsui, Satoshi*; Hao, L.*; Hasegawa, Tomoo*; Iwasa, Kazuaki*; Tsubota, Masami; Inami, Toshiya; Murakami, Yoichi*; Saha, S. R.*; Sugawara, Hitoshi*; et al.

Journal of Magnetism and Magnetic Materials, 310(2, Part1), p.e178 - e180, 2007/03

PrRuP $_{12}$ shows a metal-insulator (MI) transition at $T_{mathrm MI} simeq$ 62 K accompanied by a structural phase transition. Because LaRuP $_{12}$ without electrons does not shows the MI transition, electrons in the Pr atom plays an important role in the transition. In order to elucidate a modulation of electronic states of Pr, we have carried out a resonant X-ray scattering study of PrRuP $_{12}$ at Pr - and -edges. Below $T_{mathrm MI}$ , resonant signal at the absorption main-edge was successfully observed at the superlattice reflections of the modulation vector in addition to the energy-independent component from the lattice distortion. Because the reflection contains the difference of anomalous scattering factors between two Pr atoms in the unit cell, two different electronic states are actually ordered below $T_{MI}$ . Furthermore we found that the polarization of X-ray is mostly unrotated even at the resonance, which indicates that the resonant scattering in PrRuP $_{12}$ is almost isotropic.

Journal Articles

Knight shift measurements in the superconducting state of Pr $_{1-x}$ LaOsSb $_{12}$ (X=0.4) probed by SR

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

Journal of Magnetism and Magnetic Materials, 310(2, Part1), p.620 - 622, 2007/03

no abstracts in English

Journal Articles

Spin-triplet superconductivity in PrOsSb $_{12}$ probed by muon knight shift

Higemoto, Wataru; Saha, S. R.*; Koda, Akihiro*; Oishi, Kazuki; Kadono, Ryosuke*; Aoki, Yuji*; Sugawara, Hitoshi*; Sato, Hideyuki*

Physical Review B, 75(2), p.020510_1 - 020510_4, 2007/01

https://doi.org/10.1103/PhysRevB.75.020510

Times Cited Count：33 Percentile：76.14(Materials Science, Multidisciplinary)

We report a muon spin rotation study in single crystalline samples of the heavy fermion superconductor PrOsSb $_{12}$ . The muon Knight shift is independent of temperature passing through down to 20mK at 3 and 17kOe, indicating that the local spin susceptibility does not decrease in the superconducting state. This result is evidence that spin-triplet superconductivity is realized in PrOsSb $_{12}$ .

Journal Articles

Time reversal symmetry breaking in superconducting (Pr,La)OsSb $_{12}$ and Pr(Os,Ru)Sb $_{12}$

Shu, L.*; Higemoto, Wataru; Aoki, Yuji*; Frederick, N. A.*; Yuhasz, W. M.*; Heffner, R. H.; Oishi, Kazuki; Ishida, Kenji*; Kadono, Ryosuke*; Koda, Akihiro*; et al.

Journal of Magnetism and Magnetic Materials, 310(2, Part1), p.551 - 553, 2006/11

Journal Articles

Structural transformation on the pressure-induced metal-insulator transition in PrFe $_{4}$ 4P $_{12}$

Kawana, Daichi*; Kuwahara, Keitaro*; Sato, Masashi*; Takagi, Masatoshi*; Aoki, Yuji*; Kogi, Masafumi*; Sato, Hideyuki*; Sagayama, Hajime*; Osakabe, Toyotaka; Iwasa, Kazuaki*; et al.

Journal of the Physical Society of Japan, 75(11), p.113602_1 - 113602_4, 2006/11

https://doi.org/10.1143/JPSJ.75.113602

Times Cited Count：11 Percentile：56.33(Physics, Multidisciplinary)

We report the first X-ray diffraction experiments of PrFe $_{4}$ P $_{12}$ under high pressure. We discovered a symmetry lowering from cubic to orthorhombic or lower at the metal-insulator transition temperature, accompanied by a jump in the lattice constant, which indicates a first-order phase transition. The superlattice reflections at q=(1,0,0) observed in the low-pressure nonmagnetic ordered phase are found to disappear in the insulating phase. The temperature dependence of the lattice constant and the absence of the superlattice reflections are well explained by taking into account an antiferromagnetic ordering.

Journal Articles

Inelastic neutron scattering study on low-energy excitations of the heavy-fermion superconductor PrOsSb $_{12}$

Kuwahara, Keitaro*; Iwasa, Kazuaki*; Kogi, Masafumi*; Kaneko, Koji; Metoki, Naoto; Raymond, S.*; Masson, M.-A.*; Flouquet, J.*; Sugawara, Hitoshi*; Aoki, Yuji*; et al.

Physica B; Condensed Matter, 385-386(Part 1), p.82 - 84, 2006/11

https://doi.org/10.1016/j.physb.2006.05.109

Times Cited Count：3 Percentile：17.99(Physics, Condensed Matter)

We report inelastic neutron scattering experiments performed to investigate the low energy magnetic excitations on single crystals of the heavy-fermion superconductor PrOsSb $_{12}$ . The observed excitation clearly softens at a wave vector Q=(1,0,0), which is the same as the modulation vector of the field-induced antiferro-quadrupolar ordering, and its intensity at Q=(1,0,0) is smaller than that around the zone center. This result directly evidences that this excitonic behavior is derived mainly from nonmagnetic quadrupolar interactions. Furthermore, the narrowing of the linewidths of the excitations below the superconducting transition temperature indicates the close connection between the superconductivity and the excitons.

Journal Articles

Minor actinide neutron capture cross-section measurements with a 4 Ge spectrometer

Koizumi, Mitsuo; Osa, Akihiko; Toh, Yosuke; Kimura, Atsushi; Mizumoto, Motoharu; Oshima, Masumi; Igashira, Masayuki*; Osaki, Toshiro*; Harada, Hideo*; Furutaka, Kazuyoshi*; et al.

Nuclear Instruments and Methods in Physics Research A, 562(2), p.767 - 770, 2006/06

https://doi.org/10.1016/j.nima.2006.02.051

Times Cited Count：6 Percentile：43.85(Instruments & Instrumentation)

In order to measure the neutron capture cross section of minor actinides, we have proposed the use of a 4 Ge spectrometer. A Time-of-Flight neutron beam line for the experiment has been constructed at the KURRI electron LINAC. The assembling of the 4 Ge spectrometer is in progress. We are also developing a new data acquisition system based on a digital processing technique.