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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

$$mu$$SR study of CeRhIn$$_5$$ under applied pressure

Heffner, R.*; Goko, Tatsuo*; Andreica, D.*; Oishi, Kazuki*; Higemoto, Wataru; Ito, Takashi; Amato, A.*; Spehling, J.*; Klauss, H. H.*; Bauer, E. D.*; et al.

Journal of Physics; Conference Series, 225, p.012011_1 - 012011_6, 2010/06

 Times Cited Count:1 Percentile:53.11

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

 Times Cited Count:12 Percentile:61.24(Physics, Multidisciplinary)

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

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

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

no journal, , 

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 $$mu^+$$.

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