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CoSiYamauchi, Hiroki; Sari, D. P.*; Yasui, Yukio*; Sakakura, Terutoshi*; Kimura, Hiroyuki*; Nakao, Akiko*; Ohara, Takashi; Honda, Takashi*; Kodama, Katsuaki; Igawa, Naoki; et al.
Physical Review Research (Internet), 6(1), p.013144_1 - 013144_9, 2024/02
RhSiYamauchi, Hiroki; Sari, D. P.*; Watanabe, Isao*; Yasui, Yukio*; Chang, L.-J.*; Kondo, Keietsu; Ito, Takashi; Ishikado, Motoyuki*; Hagihara, Masato*; Frontzek, M. D.*; et al.
Communications Materials (Internet), 1, p.43_1 - 43_6, 2020/07
High-temperature short-range order is discovered up to 720 K in MnRhSi by complementary use of neutron scattering and muon spin relaxation measurements.
CuMoO
studied by muon spin relaxationKawamura, Seiko; Tomiyasu, Keisuke*; Koda, Akihiro*; Sari, D. P.*; Asih, R.*; Yoon, S.*; Watanabe, Isao*; Nakajima, Kenji
JPS Conference Proceedings (Internet), 21, p.011007_1 - 011007_5, 2018/03
RbCuMoO is a one-dimensional quantum spin system with spin frustration. The magnetic ground state of this system has been expected to be incommensurate spin-singlet from a theoretical study. Furthermore, it was recently reported that this system exhibited ferroelectricity under a magnetic field. We carried out 
SR studies on this system to understand the magnetic properties. A slow muon spin relaxation due to nuclear dipoles is observed in the whole measured temperatures ranging from 0.06 K to 250 K, indicating that no magnetic ordering. The result suggests that the system shows a spin-singlet ground state. Furthermore, it was found that the distribution of the internal magnetic field were slightly enhanced below 10 K. This temperature dependence resembles that of the electric polarization observed in the magnetic field. It may indicate that some local anomaly of charge/spin related to the ferroelectricity is detected by a microscopic probe.
SR study of impurity effects on the Cu-spin fluctuations in the overdoped regime of La
Sr
Cu
Zn
O
Risdiana*; Adachi, Tadashi*; Oki, Naoki*; Yairi, Satoshi*; Tanabe, Yoichi*; Omori, Keisuke*; Suzuki, Takao*; Watanabe, Isao*; Koda, Akihiro*; Higemoto, Wataru; et al.
Physica C, 460-462(2), p.874 - 875, 2007/09
Times Cited Count：3 Percentile：17.87(Physics, Applied)Zero-field muon-spin-relaxation measurements have been carried out for LaSrCuZnO (LSCO)with 
= 0-0.10 in the overdoped regime up to 
= 0.30, in order to investigate whether the dynamical stripe correlations are pinned and stabilized even for the overdoped LSCO or not. It has been found that the Zn-induced slowing down of the Cu-spin fluctuations is weakened with increasing but takes place in the overdoped regime and disappears at = 0.30. This suggests that the stripe-pinning model holds good in the whole superconducting regime of LSCO and that there is no quantum critical point at 
0.19.
NaCuOBrKuroiwa, Sogo*; Zenitani, Yuji*; Yamazawa, Maki*; Tomita, Yoko*; Akimitsu, Jun*; Oishi, Kazuki; Koda, Akihiro*; Saha, S. R.*; Kadono, Ryosuke*; Watanabe, Isao*; et al.
Physica B; Condensed Matter, 374-375, p.75 - 78, 2006/03
Times Cited Count：1 Percentile：6.64(Physics, Condensed Matter)A comprehensive magnetic and superconducting phase diagram determined by muon spin rotation/relaxation (SR) is presented for CaNaCuOBr which has apical bromine atoms. Evidence for antiferromagnetic (AF) order in lightly doped samples and that for quasi-static spin glass (SG)-like state in moderately doped ones are obtained by ZF-SR at low temperatures. While the phase diagram is qualitatively similar to that in typical 2-1-4 cuprates including CaNaCuOCl and LaSrCuO, it exhibits a slight shift (expansion) over the axis.
Miyake, Yasuhiro*; Nishiyama, Kusuo*; Kawamura, Naritoshi*; Makimura, Shunsuke*; Strasser, P.*; Shimomura, Koichiro*; Beveridge, J. L.*; Kadono, Ryosuke*; Fukuchi, Koichi*; Sato, Nobuhiko*; et al.
Physica B; Condensed Matter, 374-375, p.484 - 487, 2006/03
Times Cited Count：6 Percentile：31.27(Physics, Condensed Matter)The construction of the Materials and Life Science building was started in the beginning of the fiscal year of 2004. After commissioning of the accelerator and beam transport sections in 2008, muon beams will be available for users in 2009. In this letter, the latest construction status of the J-PARC Muon Science Facility is reported.
(M: Ca, Ba) probed by muon spin relaxation and muon level-crossing resonanceKuroiwa, Sogo*; Takagiwa, Hiroyuki*; Yamazawa, Maki*; Akimitsu, Jun*; Koda, Akihiro*; Kadono, Ryosuke*; Oishi, Kazuki; Higemoto, Wataru; Watanabe, Isao*
Science and Technology of Advanced Materials, 7(1), p.12 - 16, 2006/01
Times Cited Count：5 Percentile：22.34(Materials Science, Multidisciplinary)The temperature dependence of muon spin relaxation rate exhibits a significant increase below 130 K in CaB and 110 K in BaB, while no sigh of spontaneous muon precession signal under a zero field is observed. Moreover, the electric field gradient at the boron site measured by muon level-crossing resonance exhibits a step like change at 110 K in CaB. These results suggest a change in electronic state and the associated emergence of weak random magnetism below 110-130 K in these alkaline earth hexaborides.
Miyake, Yasuhiro*; Kawamura, Naritoshi*; Makimura, Shunsuke*; Strasser, P.*; Shimomura, Koichiro*; Nishiyama, Kusuo*; Beveridge, J. L.*; Kadono, Ryosuke*; Sato, Nobuhiko*; Fukuchi, Koichi*; et al.
Nuclear Physics B; Proceedings Supplements, 149, p.393 - 395, 2005/12
The J-PARC muon science experimental area is planned to be located in the integrated building of the facility for materials and life science study. One muon target will be installed upstream of the neutron target. The main feature of the facility is introduced.
Matsuzaki, Teiichiro*; Nagamine, Kanetada*; Tanase, Masakazu; Kato, Mineo; Kurosawa, Kiyoyuki; Ishida, Katsuhiko*; *; *; G.H.Eaton*
Hyperfine Interactions, 119(1-4), p.361 - 363, 1999/00
no abstracts in English
sticking and fusion neutrons in solid/liquid D-T mixtures of high tritium concentrationIshida, Katsuhiko*; Nagamine, Kanetada*; Matsuzaki, Teiichiro*; *; *; Sakamoto, Shinichi*; *; Tanase, Masakazu; Kato, Mineo; Kurosawa, Kiyoyuki; et al.
Hyperfine Interactions, 118(1-4), p.203 - 208, 1999/00
no abstracts in English
/K
ratio of muon to sticking X-rays in muon catalyzed d-t fusion at RIKEN-RAL muon facility*; Nagamine, Kanetada*; Matsuzaki, Teiichiro*; Ishida, Katsuhiko*; *; Sakamoto, Shinichi*; *; Tanase, Masakazu; Kato, Mineo; Kurosawa, Kiyoyuki; et al.
Hyperfine Interactions, 118(1-4), p.209 - 212, 1998/00
no abstracts in English
CuMoO studied by SR techniqueKawamura, Seiko; Tomiyasu, Keisuke*; Koda, Akihiro*; Sari P., D.*; Asih, R.*; Yoon, S. W.*; Watanabe, Isao*; Nakajima, Kenji
no journal, ,
RbCuMoO is a quantum spin system having zig-zag chains of the spin-1/2 Cu ions. Whereas the system is expected to exhibit an incommensurate spin-singlet state based on a ratio of the second neighbor ferromagnetic interaction 
to the first neighbor antiferromagnetic interaction 
, there is no report to bare a direct evidence for the spin-singlet ground state of this system. We carried out SR measurements on this system, to clarify its ground state and dynamics. In the zero-field measurement, the time spectra do not show changes with temperature from 300 K to 20 K, while the muon spin relaxation is enhanced below 20 K. The relaxation is again independent of temperature below 1.5 K. The result reveals that the ground state of RbCuMoO is nonmagnetic. Furthermore, the longitudinal-field SR measurements indicate characteristic behavior of the internal field and dynamics accompanying formation of the spin singlet.
MeSb[Pd(dmit)] studied by SRKawamura, Seiko; Guerin, L.*; Watanabe, Isao*; Kato, Reizo*
no journal, ,
Anion radical salt 
[Pd(dmit)] ( is a counter cation) has a two-dimensional isotropic/distorted triangular lattice structure formed by Pd(dmit) dimers. Spin-1/2 is localized at each dimer in an insulating phase. One of them, EtMeSb[Pd(dmit)], has been suggested to exhibit an isotropic triangular lattice structure and to occur a first-order transition to charge separation accompanying with formation of spin-singlet state at 
= 70 K. We have obtained the evidence for the appearance of the spin-singlet state from previous muon spin relaxation (SR) measurements on this system. However, the temperature at which the muon spin relaxation rate shows an anomaly was slightly different from suggested one. Recently, a high-resolution X-ray structure analysis reported that this system exhibits an incommensurate structure phase below 
= 105 K and a commensurate charge separation phase below 
= 66.5 K. We performed additional SR study, and observed a slight increase in dynamical component below and an obvious enhancement of the dynamical fluctuation below .
MeSb[Pd(dmit)] studied by SRKawamura, Seiko; Guerin, L.*; Watanabe, Isao*; Kato, Reizo*
no journal, ,
Molecule-based organic conductor EtMeSb[Pd(dmit)] is a two-dimensional triangular lattice system with spin-1/2. The system is suggested to undergo a first order transition to a charge separation (CS) phase with formation of a spin-singlet state at = 70 K. Recently, it was found by a high-resolution X-ray diffraction measurement that an intermediate incommensurate phase, where the degree of spatial distortion of the triangular lattice is modulated, appears below = 105 K and then the commensurate CS phase appears below = 66.5 K. We performed SR measurements on this system to investigate magnetic dynamics in the incommensurate and commensurate phases. A small enhancement of the muon spin relaxation was observed below , in addition to a drastic increase in the muon spin relaxation rate below . Our result may indicate that the magnetic correlation significantly coupled with the lattice structure changes at .
