A New High-T c Oxide Superconductor without a Rare Earth Element

Maeda, Hiroshi; Tanaka, Yoshiaki; Fukutomi, Masao; Asano, T.

doi:10.1007/978-94-011-1622-0_42

Cited by 80 publications

(97 citation statements)

References 5 publications

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“…The record superconducting transition temperature Tc had previously increased relatively slowly from 4.2 K in Hg (1911) [12] to 23 K in Nb3Ge (1973) [14,15]. Then, in an astonishingly brief period, the highest reported Tc reached 35 K in La2-xBaxCu04 (1986) [16,17], 90 K in YBa2Cu307-x (1987) [18], 110 K in BhSf2CaCu20s+x (1988) [19], and has peaked as of the time of this writing at 125 K in T12Ca2Ba2Cu30 x (1988) [20,21]. The cup rate superconductors are of physical interest not only for their high transition temperatures, but also for other, presumably related properties: extreme anisotropy, short coherence length, and large upper critical field.…”

Section: Copper Oxide Superconductorsmentioning

confidence: 99%

Magnetic flux noise in copper oxide superconductors

et al. 1994

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Section: Copper Oxide Superconductorsmentioning

confidence: 99%

Magnetic flux noise in copper oxide superconductors

et al. 1994

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“…For instance, after the discovery of superconductive quaternary and higher oxides with layered structures, many studies have been performed on complicated layered oxides [1][2][3][4][5]. In these complicated materials, defects and substitution are the key routes to tuning their anisotropic properties, and many studies have focused on controlling the vacancies, coordination, and substitution of the cation and anion sites.…”

Section: Introductionmentioning

confidence: 99%

Octahedral and trigonal-prismatic coordination preferences in Nb-, Mo-, Ta-, and W-based ABX2 layered oxides, oxynitrides, and nitrides

Miura

Tadanaga

Magome

et al. 2015

Journal of Solid State Chemistry

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Crystallographic and electronic structures of Nb-, Mo-, Ta-, and W-based layered oxides, oxynitrides, and nitrides were analyzed to elucidate the structural relationship between layered oxides and nitrides consisting of octahedral and trigonal-prismatic layers. The electron density, as derived by synchrotron X-ray analysis of LiNbO2 and Ta5−x(O,N)6, showed orbital overlaps between Nb-Nb and TaTa metals in the trigonal layers. Computational calculations based on DFT exhibited that these overlaps stabilized these structures by lowering the hybridization states composed of the , 2 − 2 , and 2 orbitals below the Fermi level. The crystal structures and formation energies suggest that tuning the Fermi level through the substitutions and vacancies of the cation/anion sites determines the structural preferences of the coordination. The properties and syntheses of these compounds are briefly described. This study enhances the understanding of layered oxides, oxynitrides, and nitrides to further the development of new synthetic approaches, compounds, and applications.

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“…Since the discovery of a high temperature superconductor [1][2][3], lots of effort has been made to realize the HTS applications [4][5][6][7][8][9][10][11][12][13][14][15]. Among the applications, those using the HTS tape are expected as the promising ones, since the tapes could give a flexible shape for variable performances corresponding to the applications.…”

Section: Introductionmentioning

confidence: 99%

Progress in R＆D of coated conductor in M-PACC project

Izumi¹,

Ibi²,

Nakaoka³

et al. 2014

Progress in Superconductivity and Cryogenics

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The five-year national project in Japan for R&D of coated conductors and applications, named as the Materials and Power Applications of Coated Conductors (M-PACC) project, was finished at the end of FY2013. The project consists of four sub-themes as cable, transformer, SMES and coated conductors. In the theme of coated conductors, the fabrication process had been developed to satisfy the requirements from the applications such as in-field I c performance, low AC loss in the long tapes etc. Through the project, the remarkable progress was achieved as follows; a high in-field minimum I c value over 54A/cm-width under 3T at 77K was realized in a 200m long EuBCO tape with artificial pinning centers of BaHfO 3 by the pulsed laser deposition (PLD) technique on the IBAD template. On the other hand, the AC loss reduction was confirmed in the tapes fabricated by both PLD and the metal organic deposition (MOD) techniques by scribing 100m tapes into 10-filamments. Additionally, the mechanism of the delamination phenomenon was systematically investigated and the strength was improved by eliminating the origins of the weak points in the films. Through the development, all targeted goals were accomplished and the several results were appreciated as a world champion data.

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A New High-T c Oxide Superconductor without a Rare Earth Element

Cited by 80 publications

References 5 publications

Magnetic flux noise in copper oxide superconductors

Magnetic flux noise in copper oxide superconductors

Octahedral and trigonal-prismatic coordination preferences in Nb-, Mo-, Ta-, and W-based ABX2 layered oxides, oxynitrides, and nitrides

Progress in R＆D of coated conductor in M-PACC project

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