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Ito, Takashi; Higemoto, Wataru; Luetkens, H.*
JPS Conference Proceedings (Internet), 2, p.010209_1 - 010209_5, 2014/03
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 SR study was performed in the D1 area, J-PARC MUSE using YIG single crystals without applied temperature gradient. Conventional pulsed 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 SR study.
Gu, B.; Ziman, T.*; Maekawa, Sadamichi
JPS Conference Proceedings (Internet), 2, p.010301_1 - 010301_5, 2014/03
Sakai, Toru; Okamoto, Kiyomi*
JPS Conference Proceedings (Internet), 2, p.010208_1 - 010208_4, 2014/03
The magnetism of the S=1/2 quantum spin nanotube is investigated by the numerical diagonalization and phenomenological renormalization. As a result, it was found that a novel quantum phase transition occurs between the gapped and gapless phases, with respect to the anisotropy.
RuO
probed by SRHigemoto, Wataru; Ito, Takashi; Koda, Akihiro*; Kadono, Ryosuke*; Oishi, Kazuki*; Yoshida, Yoshiyuki*; Onuki, Yoshichika*
no journal, ,
SrRuO is a well established example to be a spin-triplet and a time-reversal symmetry broken (TRSB) superconductor which are probed by NMR Knight shift measurement and zero-field muon spin relaxation measurement, respectively. Many experimental results show the unconventional feature of superconductivity and still much efforts are paid to the investigation SrRuO. Although TRSB is a key feature for understanding unique property of SrRuO, details are not known up to now. We will present our results of ZF and TF SR in SrRuO and future plan of the research by using ultra slow muon microscope.
Ito, Takashi; Toyoda, Akihisa*; Higemoto, Wataru; Tajima, Minori*; Matsuda, Yasuyuki*; Shimomura, Koichiro*
no journal, ,
A high-resolution beam imaging system was newly developed for pulsed muon beams in J-PARC MUSE using a plastic scintillator, a gated image intensifier, and a cooled CCD camera. The system was optimized for observation of 4 MeV muon beams and designed so as to be used with an existing muSR spectrometer in the D1 area, J-PARC MUSE. High-resolution beam profiles were obtained for a surface muon beam after exposure to the beam for several tens of seconds. A contribution from decay positrons was significantly suppressed by gating of the image ntensifier. Details of test experiments (negative muon beam profiles in the D2 area, 3D beam imaging, noise reduction, etc.) were presented.
