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Journal Articles

Local magnetic field and positive muon diffusion in yttrium iron garnet

Ito, Takashi; Higemoto, Wataru; Luetkens, H.*

JPS Conference Proceedings (Internet), 2, p.010209_1 - 010209_5, 2014/03

https://doi.org/10.7566/JPSCP.2.010209

$$mu$$$$^{+}$$SR experiments on yttrium iron garnet (YIG) single crystals under applied temperature gradient were planned to investigate thermally perturbed magnetization dynamics in YIG, which carries a spin current. A feasibility $$mu$$$$^{+}$$SR study was performed in the D1 area, J-PARC MUSE using YIG single crystals without applied temperature gradient. Conventional pulsed $$mu$$$$^{+}$$SR measurements were carried out under a longitudinal magnetic field of 0.1 T to align the direction of magnetic domains in YIG. The longitudinal relaxation rate was obtained as a function of temperature below 300 K. No significant temperature variation was found below 150 K, ensuring that the implanted muons are stationary at low temperatures. In the presentation, we described the temperature-gradient experiment in preparation as well as details of the feasibility $$mu$$$$^{+}$$SR study.

Journal Articles

$$mu$$SR evidence of nonmagnetic order and $$^{141}$$Pr hyperfine-enhanced nuclear magnetism in the cubic $$Gamma_3$$ ground doublet system PrTi$$_2$$Al$$_{20}$$

Ito, Takashi; Higemoto, Wataru; Ninomiya, Kazuhiko; Luetkens, H.*; Baines, C.*; Sakai, Akito*; Nakatsuji, Satoru*

Journal of the Physical Society of Japan, 80(11), p.113703_1 - 113703_4, 2011/11

https://doi.org/10.1143/JPSJ.80.113703
 Times Cited Count：30 Percentile：78.75(Physics, Multidisciplinary)

Journal Articles

Incommensurate-to-commensurate magnetic phase transition in SmIn$$_3$$ observed by muon spin relaxation

Ito, Takashi; Higemoto, Wataru; Ninomiya, Kazuhiko; Luetkens, H.*; Sugai, Takashi; Haga, Yoshinori; Suzuki, Hiroyuki*

Journal of the Physical Society of Japan, 80(3), p.033710_1 - 033710_4, 2011/03

https://doi.org/10.1143/JPSJ.80.033710
 Times Cited Count：4 Percentile：33.73(Physics, Multidisciplinary)

Magnetic susceptibility $$chi$$ and muon spin relaxation ($$mu$$SR) measurements are reported on SmIn$$_3$$ with a $$Gamma_8$$ ground state. Anomalies corresponding to successive phase transitions were observed in $$chi$$ at $$T_{rm I}sim$$16.5 K, $$T_{rm II}sim$$15.1 K, and $$T_{rm III}sim$$14.7 K. A spontaneous local magnetic field was detected below $$T_{rm I}$$ using the $$mu$$SR technique on the contrary to a pure quadrupolar ordering scenario proposed in the phase between $$T_{rm I}$$ and $$T_{rm II}$$. This result clearly indicates that the primary order parameters in all the ordered phases are magnetic. The local field distribution changes at around $$T_{rm II}$$ from a continuous broad one to a sharp one with decreasing temperature, suggesting that an incommensurate to commensurate magnetic phase transition takes place at this temperature. A possible magnetic structure in the ground state and importance of multipolar interactions are discussed.

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