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Journal Articles

Ambegaokar-Baratoff relations for Josephson critical current in heterojunctions with multigap superconductors

Ota, Yukihiro; Nakai, Noriyuki; Nakamura, Hiroki; Machida, Masahiko; Inotani, Daisuke*; Ohashi, Yoji*; Koyama, Tomio*; Matsumoto, Hideki*

Physical Review B, 81(21), p.214511_1 - 214511_6, 2010/06

 Times Cited Count:29 Percentile:74.77(Materials Science, Multidisciplinary)

An extension of the Ambegaokar-Baratoff relation to a superconductor-insulator-superconductor (SIS) Josephson junction with multiple tunneling channels is derived. Applying the resultant relation to a SIS Josephson junction formed by an iron-based (five-band) and a single-band Bardeen-Cooper-Schrieffer (BCS) type superconductors, a theoretical bound of the Josephson critical current ($$I_{rm c}$$) multiplied by the resistance of the junction ($$R_{rm n}$$) is given. We reveal that such a bound is useful for identifying the pairing symmetry of iron-pnictide superconductors. One finds that if a measured value of $$I_{rm c}R_{rm n}$$ is smaller than the bound then the symmetry is $$pm s$$-wave, and otherwise $$s$$-wave without any sign changes. In addition, we stress that temperature dependence of $$I_{rm c}R_{rm n}$$ is sensitive to the difference of the gap functions from the BCS type gap formula in the above heterojunction.

JAEA Reports

Scattering Profiles of Sparks and Combustibility of Filter against Hot Sparks

Tobita, Noriyuki; Okada, Takashi; Kashiro, Kashio; Matsumoto, Masaki; Watahiki, Masatoshi; Nakata, Keiji*; Gonnokami, Kiyomi*

JNC TN8430 2004-001, 125 Pages, 2004/12

JNC-TN8430-2004-001.pdf:143.53MB

An event that a pre-filter burned on fire took place in the glove box dismantlement facility of Plutonium Production Facility, on April 21, 2003. The direct cause of this event was considered to be sparks generated by an abrasive wheel cutter, some of which reached the pre-filter and eventually burned the pre-filter. Further investigation revealed that there exist other deficiencies those of which formed indirect causes of the event, such as the wheel cutter was used without protective cover and adequate shield against sparks was not installed during the operation. To prevent similar event in the future, following corrective actions were introduced. Wheel cutter will not be used without protective cover; Incombustible pre-filter will be used; Shield will be place at the front of the pre-filter. We have conducted series of experimental tests in order to evaluate and confirm the validity of these corrective actions as well as determine the cause of the fire. This report present the results of these tests.

Journal Articles

ITER engineering design

Shimomura, Yasuo; Tsunematsu, Toshihide; Yamamoto, Shin; Maruyama, So; Mizoguchi, Tadanori*; Takahashi, Yoshikazu; Yoshida, Kiyoshi; Kitamura, Kazunori*; Ioki, Kimihiro*; Inoue, Takashi; et al.

Purazuma, Kaku Yugo Gakkai-Shi, 78(Suppl.), 224 Pages, 2002/01

no abstracts in English

Oral presentation

Concept of a quake-proof information control and management system for nuclear power plant, 1; Construction of Atomic Energy Grid InfraStructure (AEGIS)

Suzuki, Yoshio; Kushida, Noriyuki; Yamagishi, Nobuhiro; Minami, Takahiro; Matsumoto, Nobuko; Nakajima, Kohei; Nishida, Akemi; Matsubara, Hitoshi; Tian, R.; Hazama, Osamu; et al.

no journal, , 

no abstracts in English

Oral presentation

Application of Atomic Energy Grid InfraStructure (AEGIS) to nuclear fusion research

Suzuki, Yoshio; Kushida, Noriyuki; Yamagishi, Nobuhiro; Nakajima, Kohei; Minami, Takahiro; Matsumoto, Nobuko; Aoyagi, Tetsuo; Nakajima, Norihiro; Iba, Katsuyuki*; Hayashi, Nobuhiko; et al.

no journal, , 

no abstracts in English

Oral presentation

Shapiro steps in heterotic SIS multi-tunneling-channel Josephson junctions; Identification of $$pm$$s-wave in iron-pnictide superconductors

Ota, Yukihiro; Nakai, Noriyuki; Nakamura, Hiroki; Machida, Masahiko; Inotani, Daisuke*; Ohashi, Yoji*; Koyama, Tomio*; Matsumoto, Hideki*

no journal, , 

An enormous amount of studies has been devoted to the identification of the pairing symmetry in iron-based superconductors. In the paper, we focus on a heterotic (multiband) superconductor- insulator-(single-band)superconductor junction. First, we derive the Amgegaokar-Baratoff relation. We evaluate a theoretical lowerbound of $$J_{rm c}R_{rm n}$$ for s-wave without sign change, which may correspond to a upper bound for $$pm$$s-wave. Next, we discuss how a fluctuation of relative phases between multiple gaps and the pairing symmetry correct the Shapiro step, e.g., the step height and the step position. On the basis of these results, we propose a conventional and direct method to identify the $$pm$$s-wave symmetry.

Oral presentation

Theory of Josephson effects in heterotic S-I-S junctions with iron-pnictide superconductors

Ota, Yukihiro; Machida, Masahiko; Nakai, Noriyuki; Nakamura, Hiroki; Koyama, Tomio*; Matsumoto, Hideki*

no journal, , 

In order to examine pairing symmetry and application potential of iron-pnictide superconductors, Josephson junctions including the new type of superconductors have been intensively examined. In particular, recent experimental achievements indicate the necessity of further theoretical investigations for how multiple tunneling contributions and the sign change between the superconducting gaps reflect the basic Josephson effects. In this paper, we theoretically examine a $$I_{rm c}R_{rm n}$$ product and a Shapiro step in a heterotic SIS junction between conventional s-wave and iron-pnictide superconductors as a typical example of Josephson junctions with multiple tunneling channels. Then, we show that they are good probe to identify the pairing symmetry of the iron-pnictide superconductors.

Oral presentation

Theory of ac Josephson effects in multiple tunneling junctions; A Probe of $$pm s$$-wave in iron-based superconductors

Ota, Yukihiro; Nakai, Noriyuki; Nakamura, Hiroki; Machida, Masahiko; Inotani, Daisuke*; Ohashi, Yoji*; Koyama, Tomio*; Matsumoto, Hideki*

no journal, , 

An enormous amount of studies has been devoted to the identification of the pairing symmetry in iron-based superconductors. We show a theory of Josephson junctions with multi-gap superconductors. We focus on a heterotic (multi-band)superconductor- insulator-(one-band)superconductor junction. We derive the Ambegaokar-Baratoff relation. We evaluate a lower bound of $$J_{rm c}R_{rm n}$$ for $$s$$-wave without sign change, which may correspond to a upper bound for $$pm s$$-wave. Next, we discuss how a fluctuation of relative phases between the gaps and the symmetry modify the Shapiro step. Thus, we propose a direct method to identify $$pm s$$-wave.

Oral presentation

Construction of a BNCT facility using an 8MeV high power proton linac in Ibaraki

Kobayashi, Hitoshi*; Kurihara, Toshikazu*; Matsumoto, Hiroshi*; Yoshioka, Masakazu*; Matsumoto, Noriyuki*; Kumada, Hiroaki*; Matsumura, Akira*; Sakurai, Hideyuki*; Hiraga, Fujio*; Kiyanagi, Yoshiaki*; et al.

no journal, , 

no abstracts in English

Oral presentation

Accelerator based BNCT using solid Li target at OIST

Matsumoto, Hiroshi*; Suzuki, Fumiko*; Sugawara, Hirotaka*; Yoshioka, Masakazu*; Higashi, Yasuo*; Matsumoto, Noriyuki*; Hasegawa, Kazuo; Kondo, Yasuhiro; Uchida, Kazuhide*; Kurokawa, Shinichi*

no journal, , 

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