公开(公告)号：JP2000302596A

公开(公告)日：2000-10-31

申请号：JP10861199

申请日：1999-04-15

Applicant: FUJIKURA LTD ,  TOKYO ELECTRIC POWER CO ,  RAILWAY TECHNICAL RES INST ,  SUMITOMO ELECTRIC INDUSTRIES ,  INT SUPERCONDUCTIVITY TECH

Inventor： KAKIMOTO KAZUTOMI ,  YASUHARA NATSUO ,  IZUMI TERUO ,  SHIOBARA TORU ,  NAKAMURA YUICHI ,  DAIMATSU KAZUYA ,  FUJINO KOZO

IPC: C30B29/22 ,  H01B12/06

Abstract: PROBLEM TO BE SOLVED: To provide an oxide superconductor having a thick-filmy oxide superconducting layer on a base material and also to provide an oxide superconductor production process by which a thick-filmy oxide superconducting layer can be formed on a base material at a remarkably higher film forming rate as compared with that attained by a vapor phase process without causing any damage to the base material by a melt. SOLUTION: This superconductor is provided with: a base material 1 consisting of a high-melting point metal; an oxide intermediate layer 2 formed on at least one surface of the base material 1; an oxide superconductor seed film 3 formed on the intermediate layer 2; a superconducting base material layer 5 that contains at least one of constituent elements of the oxide intermediate layer 2 and is formed on the oxide superconductor seed film 3 by a liquid phase epitaxy; and a thick-filmy oxide superconducting layer 6 formed on the superconducting base material layer 5 by a liquid phase epitaxy.

公开(公告)号：JP2000281336A

公开(公告)日：2000-10-10

申请号：JP2000063319

申请日：2000-03-03

Applicant: INT SUPERCONDUCTIVITY TECH

Inventor： YAMAMOTO FUMIKO ,  KO YASUYUKI ,  TAJIMA SETSUKO

IPC: C01G13/00 ,  C01G1/00 ,  C01G3/00 ,  H01B12/00

Abstract: PROBLEM TO BE SOLVED: To produce 'an oxide superconductor containing Ba as a constituent element' which exhibits stably high superconductor characteristics and is free from the deterioration with the passage of time. SOLUTION: It was found that the cause of the deterioration of the characteristics of a Ba-containing oxide superconductor (e.g. Hg-or Nd-system can be eliminated by lowering the content of the impurity carbon to be less than a prescribed level, which impurity carbon is mainly introduced through a raw material for feeding Ba. Based on this fact, the characteristics of the Ba-containing oxide superconductor are improved by allowing the superconductor to have such a constitution that the content of the impurity carbon is controlled to be not more than 2.0 atom.%. The Ba-containing oxide superconductor is produced by using, as the Ba-supplying raw material, BaO in which the content of the impurity carbon is reduced to be not more than 0.5% and further mixing the raw materials and synthesizing the product in a dry atmosphere in which the content of the gas containing carbon is restricted.

公开(公告)号：JP2000260187A

公开(公告)日：2000-09-22

申请号：JP5937699

申请日：1999-03-05

Applicant: NEC CORP ,  INT SUPERCONDUCTIVITY TECH

Inventor： NAGASAWA SHUICHI ,  MIYAHARA KAZUNORI ,  ENOMOTO YOICHI

IPC: G11C11/44

Abstract: PROBLEM TO BE SOLVED: To substantially reduce a necessary AC bias current by using an effective combination of an AC type logical circuit biased by an AC current and a fluxoid type logic circuit biased by a DC current. SOLUTION: A 256 RAM block construction comprises a memory cell with 16 row and 16 columns, a voltage type logic driver circuit and sense circuit composed of superconductive latching elements biased by an AC current, and a fluxoid type logic decoder circuit composed of a superconductive single fluxoid quantum (FSQ) biased by a DC current. An AC power used for the whole RAMs can largely be reduced by arranging the decoder circuit part to be a fluxoid type logic circuit biased by a DC current, and an increase in AC power consumption in the driver circuit can be absorbed by adopting a multi-driver system.

公开(公告)号：JP2000252115A

公开(公告)日：2000-09-14

申请号：JP5397099

申请日：1999-03-02

Applicant: MITSUBISHI CABLE IND LTD ,  INT SUPERCONDUCTIVITY TECH

Inventor： MAEDA JUNYA ,  IZUMI TERUO ,  SHIOBARA TORU

IPC: H01F6/06 ,  C04B37/00 ,  H01B12/00

Abstract: PROBLEM TO BE SOLVED: To suppress the occurrence of a reaction layer at the interface between an oxide superconducting material and a normal conductor, by partly or wholly dipping a member formed of the oxide superconducting material in the normal conductor maintained in a molten state, after mixing a material having the same component as the metallic component of the superconducting material in the member. SOLUTION: A member 1, formed of an oxide superconducting material, is partly or wholly dipped in a normal conductor 2 maintained in a molten state after a material having at least the same component as the metallic component of the superconducting material is mixed in the member 1. A Y-based high-temperature superconducting material is used as the material mixed in the normal conductor 2. At mixing of the Y-based superconducting material in the conductor 2, the material is pulverized. A mixing ratio of the superconducting material to 100 pts.wt. of normal conductor 2 is adjusted to about 0.5-20 pts.wt. The conductor 2 mixed with the superconducting material is melted in a crucible 4 made of alumina. Therefore, the occurrence of a reaction layer at the interface between the oxide superconducting material and normal conductor 2 can be suppressed.

公开(公告)号：JP2000203983A

公开(公告)日：2000-07-25

申请号：JP548499

申请日：1999-01-12

Applicant: INT SUPERCONDUCTIVITY TECH

Inventor： TOMIMOTO KOKICHI ,  TAJIMA SETSUKO

IPC: C30B15/00 ,  C30B29/22

Abstract: PROBLEM TO BE SOLVED: To provide a molten oxide producing technique by which the outflow of a melt from a crucible during the formation of the molten oxide as the raw material for producing a superconductor, etc., is conveniently and efficiently prevented. SOLUTION: A crucible 11 is placed on a support 1 so that >=2 single crystal polyhedrons such as single-crystal cubes, etc., are vertically stacked on one another without the edges of the adjacent polyhedrons coinciding, crossing or in contact with one another. An oxide 13 is heated and melted in the crucible to form a molten oxide, and the molten oxide is then crystallized to produce the oxide crystals of a superconductor, etc.

公开(公告)号：JPH11111080A

公开(公告)日：1999-04-23

申请号：JP28315597

申请日：1997-10-01

Applicant: INT SUPERCONDUCTIVITY TECH ,  NGK INSULATORS LTD ,  CHUBU ELECTRIC POWER ,  HITACHI LTD

Inventor： ARAI YUSUKE ,  YAMADA YASUSHI ,  KAWASHIMA JUNICHI ,  BUN TAKEKUNI ,  HIRABAYASHI IZUMI ,  KOSHIZUKA NAOKI ,  HIGASHIYAMA KAZUHISA ,  FUJIWARA TETSUO

IPC: C01G1/00 ,  C01G3/00 ,  H01B12/06 ,  H01L39/02

Abstract: PROBLEM TO BE SOLVED: To improve critical current density in a magnetic field by the introduction of low inclination grain boundaries into a superconducting oxide film by forming a biaxially oriented superconducting oxide film on a metallic silver substrate having a 100} texture. SOLUTION: An oxide intermediate layer biaxially oriented in a substrate plane, a parallel plane of a substrate is proper in 100}, and magnesium oxide MgO is used as a material. When a lattice miss fit of oxide and superconducting oxide of this intermediate layer is high like 6 to 11%. The superconducting oxide growing on the oxide of the intermediate layer performs pseudo epitaxial growth having fluctuation in in-plane orientation. Due to this fluctuation, low inclination grain boundaries less than one degree of an inclination of a degree of not interrupting a path of a superconducting current, are generated in large numbers in a C axis oriented superconducting oxide film manufactured on the oxide of the intermediate layer. Since these low inclination grain boundaries operate as pin fastening points to trap a magnetic field, high critical current density in the magnetic field can be realized.

公开(公告)号：WO2004040046A9

公开(公告)日：2004-10-07

申请号：PCT/JP0313887

申请日：2003-10-29

Applicant: SUMITOMO ELECTRIC INDUSTRIES ,  INT SUPERCONDUCTIVITY TECH ,  HASEGAWA KATSUYA ,  IZUMI TERUO ,  SHIOHARA YUH ,  SUGAWARA YOSHIHIRO ,  HIRAYAMA TSUKASA ,  OBA FUMIYASU ,  IKUHARA YUICHI

Inventor： HASEGAWA KATSUYA ,  IZUMI TERUO ,  SHIOHARA YUH ,  SUGAWARA YOSHIHIRO ,  HIRAYAMA TSUKASA ,  OBA FUMIYASU ,  IKUHARA YUICHI

IPC: C30B29/22 ,  C30B23/02 ,  C30B25/18 ,  H01L39/24

CPC classification number: H01L39/2461 ,  C30B23/02 ,  C30B25/18 ,  C30B29/22 ,  C30B29/225

Abstract: A technology for forming a thin film of good quality on a basic material through an intermediate layer. The technology is applied preferably to the formation of a high-temperature superconducting oxide thin film being employed in a superconducting wire material or a superconducting device. The method for forming a thin film on a basic material through an intermediate layer is characterized by comprising a process for calculating the energy Ea on the interface A between the basic material and the intermediate layer, the energy Eb on the interface B between the intermediate layer and the thin film, and the energy Ec on the interface C between the basic material and the thin film under a state where the intermediate layer does not exist, and a process for selecting an intermediate layer material satisfying the conditions Ea

Abstract translation: 通过中间层在基础材料上形成高质量薄膜的技术。 该技术优选用于在超导线材料或超导装置中使用的高温超导氧化物薄膜的形成。 通过中间层在基础材料上形成薄膜的方法的特征在于包括用于计算基础材料与中间层之间的界面A上的能量Ea，中间层之间界面B上的能量Eb 以及在不存在中间层的状态下在基材和薄膜之间的界面C上的能量Ec和选择满足条件Ea

公开(公告)号：JP2003264458A

公开(公告)日：2003-09-19

申请号：JP2002061425

申请日：2002-03-07

Applicant: NEC CORP ,  INT SUPERCONDUCTIVITY TECH

Inventor： NAGASAWA SHUICHI ,  TAKAHASHI KAZUHIRO ,  MIYAHARA KAZUNORI ,  ENOMOTO YOICHI

IPC: H01L39/22 ,  H03K19/195 ,  H03K19/21

Abstract: PROBLEM TO BE SOLVED: To provide a superconducting single magnetic flux quantum multi-input exclusive OR circuit which can be operated at high speed without increasing the number of logic stages. SOLUTION: In the conventional superconducting single magnetic flux quantum two input exclusive OR circuit having a function that performs arithmetic operations of exclusive OR to a first input signal and a second input signal and outputs the result to an output end, it is constituted so that it has functions that perform arithmetic operations of exclusive OR to the first, second and third input signals and output the results on the output end by further providing an input circuit for inputting at least one or more third input signals in addition to the first and second input signals and providing the input circuit with a function that delays the phase of the third input signal to the phases of the first and second input signals in a desired time. COPYRIGHT: (C)2003,JPO

公开(公告)号：JP2003264319A

公开(公告)日：2003-09-19

申请号：JP2002064448

申请日：2002-03-08

Applicant: INT SUPERCONDUCTIVITY TECH

Inventor： ADACHI SEIJI ,  WAKANA HIRONORI ,  TANABE KEIICHI

IPC: H01L39/22 ,  H01L39/24

Abstract: PROBLEM TO BE SOLVED: To provide a high temperature superconducting Josephson junction in which a variation in characteristics of Josephson junction is suppressed and the characteristics and reliability of a product employing the Josephson junction can be enhanced, and a superconducting electronic device employing it. SOLUTION: The inventive high temperature superconducting Josephson junction sandwiches a barrier layer 5 by two superconductors 2 and 4 wherein the superconductors 2 and 4 contain one or more kinds of elements selected from among Y, La, Nd, Sm, Eu, Gd, Dy, Ho, Er, Tm, Yb and Lu, one or more kinds of elements selected from among Ba, Sr and Ca, Cu and oxygen, and the barrier layer 5 contains one or more kinds of elements selected from among La, Nd, Sm and Eu, and one or more kinds of elements selected from among Y, Gd, Dy, Ho, Er, Tm, Yb and Lu. COPYRIGHT: (C)2003,JPO

公开(公告)号：JP2002326817A

公开(公告)日：2002-11-12

申请号：JP2002037338

申请日：2002-02-14

Applicant: INT SUPERCONDUCTIVITY TECH ,  OKI ELECTRIC IND CO LTD

Inventor： CHO ISAMU ,  KO TATSUSHO ,  KOSHIZUKA NAOKI ,  SHIBATA SUSUMU

IPC: C01G1/00 ,  C01G29/00 ,  C30B29/22 ,  H01B13/00

Abstract: PROBLEM TO BE SOLVED: To provide a Bi-based oxide superconductor having Bi 2212 structure whose superconductive property at 20 K is more excellent than the conventional one. SOLUTION: The subject conductor has Bi 2212 structure and its composition formula is Bi2-x Sr2 Ca1 Cu2+x O8+y . (however, 0.1