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Ishikado, Motoyuki*; Takahashi, Ryuta*; Yamauchi, Yasuhiro*; Nakamura, Masatoshi*; Ishimaru, Sora*; Yamauchi, Sara*; Kawamura, Seiko; Kira, Hiroshi*; Sakaguchi, Yoshifumi*; Watanabe, Masao; et al.
JPS Conference Proceedings (Internet), 41, p.011010_1 - 011010_7, 2024/05
D
measured with inelastic neutron spectroscopyYamaura, Junichi*; Hiraka, Haruhiro*; Iimura, Soshi*; Muraba, Yoshinori*; Bang, J.*; Ikeuchi, Kazuhiko*; Nakamura, Mitsutaka; Inamura, Yasuhiro; Honda, Takashi*; Hiraishi, Masatoshi*; et al.
Physical Review B, 99(22), p.220505_1 - 220505_6, 2019/06
Times Cited Count：3 Percentile：16.31(Materials Science, Multidisciplinary)Inelastic neutron scattering was performed for an iron-based superconductor, where most of D (deuterium) replaces oxygen, while a tiny amount goes into interstitial sites. By first-principle calculation, we characterize the interstitial sites for D (and for H slightly mixed) with four equivalent potential minima. Below the superconducting transition temperature Tc = 26 K, new excitations emerge in the range 5-15 meV, while they are absent in the reference system LaFeAsOF. The strong excitations at 14.5 meV and 11.1 meV broaden rapidly around 15 K and 20 K, respectively, where each energy becomes comparable to twice of the superconducting gap. The strong excitations are ascribed to a quantum rattling, or a band motion of hydrogen, which arises only if the number of potential minima is larger than two.
Kawamura, Seiko; Takahashi, Ryuta*; Ishikado, Motoyuki*; Yamauchi, Yasuhiro*; Nakamura, Masatoshi*; Ouchi, Keiichi*; Kira, Hiroshi*; Kambara, Wataru*; Aoyama, Kazuhiro*; Sakaguchi, Yoshifumi*; et al.
Journal of Neutron Research, 21(1-2), p.17 - 22, 2019/05
The Cryogenics and Magnets group in the Sample Environment team is responsible for operation of cryostats and magnets for user's experiments at the MLF in J-PARC. We have introduced a top-loading 
He cryostat, a bottom-loading 
He cryostat, a dilution refrigerator insert and a superconducting magnet. The frequency of use of them dramatically becomes higher in these two years, as the beam power and the number of proposal increase. To respond such situation, we have made efforts to enhance performance of these equipment as follows. The He cryostat originally involves an operation software for automatic initial cooling down to the base temperature and automatic re-charge of He. Recently we made an additional program for automatic temperature control with only the sorb heater. Last year, a new outer vacuum chamber of the magnet with an oscillating radial collimator (ORC) was fabricated. The data quality was drastically improved by introducing this ORC so that the magnet can be used even for the inelastic neutron scattering experiments.
; ; Okada, Takashi; Harada, Hideo; Nakamura, Shoji; ; Seki, Masayuki
PNC TN8440 95-014, 192 Pages, 1995/03
None
Oku, Takayuki; Watanabe, Masao; Kawamura, Seiko; Aso, Tomokazu; Takahashi, Ryuta*; Sakai, Kenji; Yamauchi, Yasuhiro*; Nakamura, Masatoshi*; Munakata, Koji*; Ishikado, Motoyuki*; et al.
no journal, ,
Sample environment (SE) team is organized at the MLF of the J-PARC. SE equipment are prepared and the users are supported by the SE team. SE team consists of sub-team of (1) low temperature & magnetic field, (2) high temperature, (3) high pressure, (4) soft matter, (5) pulsed magnet, (6) light irradiation, (7) 
He spin filter. In this presentation, we will present the current status of the sample environmental equipment, the future plan and the support activities for users.
Watanabe, Masao; Oku, Takayuki; Kawamura, Seiko; Takata, Shinichi; Takahashi, Ryuta*; Sakai, Kenji; Yamauchi, Yasuhiro*; Nakamura, Masatoshi*; Munakata, Koji*; Ishikado, Motoyuki*; et al.
no journal, ,
Sample environment (SE) team is organized at the MLF of the J-PARC. SE equipment are prepared and the users are supported by the SE team. BL Common SE equipment includes (1) not frequently used but essential equipment, (2) very expensive equipment, (3) equipment that requires specialized knowledge and skills. SE team consists of sub-team of (1) low temperature & magnetic field, (2) high temperature, (3) high pressure, (4) soft matter, (5) pulsed magnet, (6) light irradiation, (7) He spin filter. In this presentation, we will present the current status of the sample environmental equipment, the future plan and the support activities for users.
Kawamura, Seiko; Watanabe, Masao; Takahashi, Ryuta*; Munakata, Koji*; Takata, Shinichi; Sakaguchi, Yoshifumi*; Ishikado, Motoyuki*; Ouchi, Keiichi*; Arima, Hiroshi*; Hattori, Takanori; et al.
no journal, ,
At the Materials and Life Science Experimental Facility (MLF) in J-PARC, most of sample environment (SE) such as closed-cycle refrigerator (CCR) is prepared by the instruments individually as the standard SE equipment depending on the experiments carried out at the instrument. This system has advantages that the instrument group can directly contact the users and respond to their request and that the instrument can design its various components to adopt the instrument. On the other hand, several pieces of SE, which are not utilized so frequently but essential, are managed by the SE team. They are commonly used at several instruments in MLF. In these SEs, several cryostats, a high-temperature furnace and a superconducting magnet can be currently used for the inelastic and quasi-elastic neutron scattering experiments. Furthermore, high-pressure experiment using the Paris-Edinburgh press or clamped cell is also being prepared for these experiments.
Oku, Takayuki; Watanabe, Masao; Sakaguchi, Yoshifumi*; Kawamura, Seiko; Takahashi, Ryuta*; Yamauchi, Yasuhiro*; Nakamura, Masatoshi*; Ishikado, Motoyuki*; Ouchi, Keiichi*; Arima, Hiroshi*; et al.
no journal, ,
Sample environment team at the Materials and Life Science Experimental Facility in J-PARC has worked on development and operation of cryogenics, magnets, high temperature, high pressure, soft matter related items and special environment including pulsed magnets, light irradiators and He-3 spin filters. In the talk, our status is presented, and issues are addressed.
Watanabe, Masao; Oku, Takayuki; Kawamura, Seiko; Takata, Shinichi; Su, Y. H.; Takahashi, Ryuta*; Yamauchi, Yasuhiro*; Nakamura, Masatoshi*; Ishikado, Motoyuki*; Sakaguchi, Yoshifumi*; et al.
no journal, ,
At Material Life Science Laboratory (MLF) in J-PARC, each beamline (BL) has standard sample environment (SE) equipment, while our SE team is organized to maintain BL common sample environment equipment and support the users. We have expensive equipment that is not frequently used but indispensable, and that requires specialized knowledge and skills for operation as BL common SE equipment. The SE team has sub-teams as;(1) cryo & magnet, (2) high temperature, (3) stress (high pressure, tension and fatigue machine), (4) soft matter, (5) humidity, (6) special environment (pulsed magnet, light irradiation and computation). In this presentation, we will explain the current status of BL common sample environment equipment.
