JAEA
  • help
  • PC | SP
  • JP | EN
          
Refine your search：     
Report No.
 - 
Clear All
Search Results: Records 1-17 displayed on this page of 17
  • 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

Large spontaneous Hall effect arising from collinear antiferromagnetism in Ce$$_{2}$$PtGe$$_{6}$$

Matsuda, Hayata*; Hibino, Ruo*; Tabata, Chihiro; Kaneko, Koji; Higa, Nonoka*; Onimaru, Takahiro*; Tanaka, Hiroto*; To, Hideki*; Sugawara, Hitoshi*; Hayashi, Junichi*; et al.

Physical Review B, 113(19), p.195116_1 - 195116_8, 2026/05

https://doi.org/10.1103/4x23-wbc6
 Times Cited Count：0 Percentile：0.00(Materials Science, Multidisciplinary)

Journal Articles

Paramagnetic electron-nuclear spin entanglement in HoCo$$_2$$Zn$$_{20}$$

Kitazawa, Takafumi; Shimura, Yasuyuki*; Onimaru, Takahiro*; Tsuchida, Shun*; Kubo, Katsunori; Haga, Yoshinori; Sakai, Hironori; Tokiwa, Yoshifumi; Kambe, Shinsaku; Tokunaga, Yo

Physical Review Research (Internet), 8(2), p.023009_1 - 023009_14, 2026/04

https://doi.org/10.1103/bzvk-grrv

Journal Articles

Multipole and superconducting state in PrIr$$_2$$Zn$$_{20}$$ probed by muon spin relaxation

Higemoto, Wataru; Ito, Takashi; Ninomiya, Kazuhiko; Onimaru, Takahiro*; Matsumoto, Keisuke*; Takabatake, Toshiro*

Physical Review B, 85(23), p.235152_1 - 235152_4, 2012/06

https://doi.org/10.1103/PhysRevB.85.235152
 Times Cited Count：6 Percentile：25.89(Materials Science, Multidisciplinary)

We performed muon spin rotation and relaxation measurements ($$mu$$SR) in caged structural heavy fermion system PrIr$$_2$$Zn$$_{20}$$ to elucidate magnetic and superconducting properties. Temperature independent $$mu$$SR spectra were observed below 1K, indicating that the phase transition at 0.11K is non-magnetic origin, most probably pure quadrupole ordering. In the superconducting phase, no sign of unconventional superconductivity, like a broken time reversal symmetry superconductivity, is seen below $$T_c$$=0.05K. Moreover, we have observed spontaneous muon spin precession in a zero field in the paramagnetic phase below 15K, suggesting a novel coupling between $$^{141}$$Pr nuclei and muon realize in PrIr$$_2$$Zn$$_{20}$$.

Journal Articles

$$mu$$SR studies on caged compound PrIr$$_2$$Zn$$_{20}$$

Higemoto, Wataru; Ito, Takashi; Ninomiya, Kazuhiko; Onimaru, Takahiro*; Matsumoto, Keisuke*; Takabatake, Toshiro*

Physics Procedia, 30, p.125 - 128, 2012/00

https://doi.org/10.1016/j.phpro.2012.04.055
 Times Cited Count：1 Percentile：30.43(Physics, Condensed Matter)

We performed muon spin rotation and relaxation in PrIr$$_2$$Zn$$_{20}$$ at J-PARC to elucidate magnetic state. In the paramagnetic phase, we have observed spontaneous muon spin precession, even in a zero field. This fact suggests that a novel coupling between Pr nuclei and muon may realize in PrIr$$_2$$Zn$$_{20}$$.

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：64.92(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

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：61.03(Physics, Multidisciplinary)

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, 2007/00

https://doi.org/10.1016/j.jmmm.2006.10.122
 Times Cited Count：4 Percentile：21.36(Materials Science, Multidisciplinary)

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

Long periodic magnetic structure in CeB$$_2$$C$$_2$$

Oyama, Kenji*; Kaneko, Koji; Onimaru, Takahiro*; Tobo, Aya*; Ishimoto, Kenichi*; Onodera, Hideya*; Yamaguchi, Yasuo*

Journal of the Physical Society of Japan, 72(12), p.3303 - 3304, 2003/12

https://doi.org/10.1143/JPSJ.72.3303
 Times Cited Count：6 Percentile：42.03(Physics, Multidisciplinary)

no abstracts in English

Oral presentation

Basic physical properties of single crystalline HoCo$$_2$$Zn$$_{20}$$

Kitazawa, Takafumi; Shimura, Yasuyuki*; Onimaru, Takahiro*; Haga, Yoshinori; Sakai, Hironori; Tokiwa, Yoshifumi; Kambe, Shinsaku; Yamamoto, Etsuji; Tokunaga, Yo

no journal, , 

no abstracts in English

Oral presentation

Determination of the hyperfine electron-nuclear level scheme in HoCo$$_2$$Zn$$_{20}$$

Kitazawa, Takafumi; Shimura, Yasuyuki*; Onimaru, Takahiro*; Tsuchida, Shun*; Kubo, Katsunori; Haga, Yoshinori; Sakai, Hironori; Tokiwa, Yoshifumi; Kambe, Shinsaku; Tokunaga, Yo

no journal, , 

We determined the electron-nuclear level scheme in the paramagnetic state of the holmium-based cubic compound HoCo$$_2$$Zn$$_{20}$$ using macroscopic thermodynamic probes alone. From magnetization and specific heat measurements, together with detailed analyses, we obtained the crystalline electric field (CEF) parameters, the magnetic exchange constant, and the hyperfine coupling constant between the $$4f$$ magnetic moment and the $$^{165}$$Ho nuclear spin. These refined parameters reveal that the $$Gamma_5$$ CEF ground state is split by the hyperfine coupling, and that the sextet formed through coupling between the effective $$S=1$$ spin of the $$f$$ electrons and the $$I=7/2$$ spin of the $$^{165}$$Ho nucleus constitutes the paramagnetic ground state. Remarkably, the splitting energy width exceeds 1 K at zero magnetic field, underscoring the importance of electron-nuclear spin coupling in strongly correlated electron systems.

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

$$mu$$SR studies on PrRh$$_2$$Zn$$_{20}$$

Higemoto, Wataru; Ito, Takashi; Nagasawa, Naohiro*; Onimaru, Takahiro*; Takabatake, Toshiro*

no journal, , 

In caged structural compound PrRh$$_2$$Zn$$_{20}$$, superconductivity and other unknown phase transition occur at the same temperature 0.06K. This phase transition is speculated as quadrupole phase transition. However, no any microscopic study is carried out up to now and detail of the phase transition is not known at all. We have studied quadrupole ordering and superconductivity in PrRh$$_2$$Zn$$_{20}$$ by using muon spin relaxation method at J-PARC muon science facility. As a result, we have not observed any significant change of the signal above and below phase transition temperature. This fact indicate the no magnetic phase transition occur and support the quadrupole phase transition. In addition, no trace of an unconventional superconductivity was detected in our measurements. In the presentation, we will mention detail of the measurements.

Oral presentation

Formation of isolated three-spin system Pr-$$mu^+$$-Pr in PrPb$$_3$$

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

no journal, , 

An isolated few-spin system including a $$mu^+$$ spin $$S$$ is usually unlikely to be realized in metal. Contrary to the expectation, we actually found an isolated three-spin system $$^{141}$$Pr-$$mu^+$$-$$^{141}$$Pr in a rare-earth intermetallic compound PrPb$$_3$$. This system results in $$mu^+$$ spin precession with six frequencies at regular intervals. Such harmonic frequencies cannot be obtained only from dipolar interactions between $$S$$ and bare $$^{141}$$Pr nuclear spins $$I_{141}$$. Extremely anisotropic enhancement of the $$S$$-$$I_{141}$$ coupling is required. This enhancement can be explained by mechanism of the $$^{141}$$Pr hyperfine-enhanced nuclear magnetism and $$mu^+$$-induced perturbation on 4f-electronic state of two Pr ions next to the $$mu^+$$.

Oral presentation

Basic physical properties and precise ground state of HoCo$$_2$$Zn$$_{20}$$

Kitazawa, Takafumi; Shimura, Yasuyuki*; Onimaru, Takahiro*; Haga, Yoshinori; Sakai, Hironori; Tokiwa, Yoshifumi; Kambe, Shinsaku; Yamamoto, Etsuji; Tokunaga, Yo

no journal, , 

We investigated the magnetic properties of HoCo$$_2$$Zn$$_{20}$$, a cubic compound that is a candidate material for realizing the three-channel Kondo effect (3CK). Macroscopic physical measurements revealed antiferromagnetic ordering below 0.6 K. Analysis of magnetization data above 2 K suggests a $$Gamma_5$$ crystalline-electric field (CEF) ground state, in which 3CK is theoretically expected to occur. However, discrepancies between the experimental and calculated specific heat at very low temperatures were observed due to nuclear specific heat at Ho sites. By incorporating hyperfine coupling into the model, we successfully reproduced the experimental data and demonstrated that the $$Gamma_5$$ CEF ground state is split by hyperfine interactions on the order of 1 K. In this talk, we will present details of the 4$$f$$-electron ground state and discuss the possible emergence of 3CK in cubic Ho-based compounds.

Oral presentation

Determination of the hyperfine coupling constant in HoCo$$_2$$Zn$$_{20}$$ via thermodynamic measurements

Kitazawa, Takafumi; Shimura, Yasuyuki*; Onimaru, Takahiro*; Haga, Yoshinori; Sakai, Hironori; Tokiwa, Yoshifumi; Kambe, Shinsaku; Yamamoto, Etsuji; Tokunaga, Yo

no journal, , 

no abstracts in English

Oral presentation

f-electronic state around an interstitial hydrogen in rare-earth intermetallics

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

no journal, , 

no abstracts in English

Oral presentation

$$mu$$SR study on PrIr$$_2$$Zn$$_{20}$$ under magnetic field

Higemoto, Wataru; Okazawa, Takeshi; Oshima, Kohei*; Ito, Takashi; Robert, S.*; Matsumoto, Keisuke*; Onimaru, Takahiro*

no journal, , 

no abstracts in English

17 (Records 1-17 displayed on this page)
  • 1