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RISS 인기검색어
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- 저자 : Masahiko Machida (검색결과 2 건)
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A d-dot As an Element of Superconducting Devices
Masaru Kato,Hisataka Suematsu,Masahiko Machida,Masaki Hirayama,Takekazu Ishida,Tomio Koyama 한국물리학회 2006 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.48 No.5I
A d-dot is the composite structure of a d-wave superconductor and an s-wave superconductor. Spontaneous half-quantum magnetic °uxes appear around the corners of the d-wave supercon- ducting region. Because of the broken time-reversal symmetry of this state, there are always two degenerate states. We show some basic properties of the d-dot and discuss the potential ability of using the d-dot as a two-state device.
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Superconducting MgB2 Films as Radiation Detectors
Takekazu Ishida,Daisuke Fujiwara,Hisashi Shimakage,Kazuo Satoh,Masahiko Machida,Masaru Kato,Masatoshi Nishikawa,Shigehito Miki,Tsutomu Yotsuya,Zhen Wang 한국물리학회 2006 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.48 No.5I
The thermal response of a membrane-structured MgB2 film can be used to detect various sorts of radiations. High-quality MgB2 films were prepared by a sputtering technique. The MgB2 radiation detector consisted of an MgB2 thin-film meander line on a 0.5-μm-thick SiN membrane. The detector devices were placed in a 4 K refrigerator, and the operating temperature was controlled at a certain temperature below Tc. Light from a 20-ps pulsed laser directly irradiated the MgB2 device; the end of the optical fiber was fixed in front of the device. An erbium-doped fiber amplifier (EDFA) and a GP-IB attenuator were used to control the laser power, and the output voltage was observed through a low-noise amplifier by using a digital oscilloscope. The output signals caused by thermal response were clearly observed. Systematic studies of the output signals were conducted, and effects of device design, dc bias conditions, bias temperature, and input laser power were considered. We report the out-of-equilibrium thermodynamics, which was investigated by means of extensive computer simulations based on the time-dependent Ginzburg-Landau equations, thermodynamics, and electrodynamics. Large-scale calculations were carried out under the realistic conditions of actual devices by using an Earth Simulator (ES). One attractive application is to use the device as a novel neutron detector by employing the 10B(n,)7Li nuclear reaction with a local energy release of 2.3 MeV.
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