WEKO3
アイテム
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Hydrostatic pressure effects on superconducting transition of nanostructured niobium highly strained by high-pressure torsion
名前 / ファイル | ライセンス | アクション |
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scunit-2018_20.pdf (5.3 MB)
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Item type | 学術雑誌論文 = Journal Article(1) | |||||||||||||||||||||||||||||
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公開日 | 2019-04-09 | |||||||||||||||||||||||||||||
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資源タイプ識別子 | http://purl.org/coar/resource_type/c_6501 | |||||||||||||||||||||||||||||
資源タイプ | journal article | |||||||||||||||||||||||||||||
タイトル | ||||||||||||||||||||||||||||||
言語 | en | |||||||||||||||||||||||||||||
タイトル | Hydrostatic pressure effects on superconducting transition of nanostructured niobium highly strained by high-pressure torsion | |||||||||||||||||||||||||||||
言語 | ||||||||||||||||||||||||||||||
言語 | eng | |||||||||||||||||||||||||||||
著者 |
美藤, 正樹
× 美藤, 正樹
WEKO
1968
× Kitamura, Yuichiro× Tajiri, Takayuki× 中村, 和磨
WEKO
20202
× Shiraishi, Ryo× Ogata, Kazuma× 出口, 博之
WEKO
1115
× 山口, 富子
WEKO
18040
× Takeshita, Nao× Nishizaki, Terukazu× Edalati, Kaveh× 堀田, 善治 |
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抄録 | ||||||||||||||||||||||||||||||
内容記述タイプ | Abstract | |||||||||||||||||||||||||||||
内容記述 | We study the effects of hydrostatic pressure (HP) compression on the superconducting transition of severely strained Nb samples, whose grain sizes are reduced to the submicrometer level. Engineered granularity by high-pressure torsion (HPT) treatment changes the strength of coupling between submicrometer-scale grains and introduces lattice strain. We attempt to utilize the initially accumulated shear strain in the starting material for increasing the superconducting transition temperature Tc under HP compression. The HP effects on non-strained Nb have already been investigated in the pressure regime over 100 GPa by Struzhkin et al. [Phys. Rev. Lett. 79, 4262 (1997)], and Tc reportedly exhibited an increase from 9.2 to 9.9 K at approximately 10 GPa. (1) Slightly strained Nb in the HPT treatment exhibits the increase in Tc under HP due to the strengthening of the intergrain coupling, so the pressure scale of the pressure response observed by Struzhkin et al. is reduced to approximately one-seventh at the maximum. (2) Prominently strained Nb in the HPT treatment exhibits the increase in Tc under HP due to a reduction in structural symmetry at the unit-cell level: In a Nb sample subjected to HPT (6 GPa, 10 revolutions), Tc exceeds 9.9 K at approximately 2 GPa. According to our first-principle calculations, the reduction in the structural symmetry affords an increase in the density of states at the Fermi energy, thereby yielding a prominent increase in Tc at low pressures. | |||||||||||||||||||||||||||||
言語 | en | |||||||||||||||||||||||||||||
書誌情報 |
en : Journal of Applied Physics 巻 125, 号 12, p. 125901-1-125901-13, 発行日 2019-03-22 |
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出版社 | ||||||||||||||||||||||||||||||
言語 | en | |||||||||||||||||||||||||||||
出版者 | AIP Publishing | |||||||||||||||||||||||||||||
DOI | ||||||||||||||||||||||||||||||
関連タイプ | isIdenticalTo | |||||||||||||||||||||||||||||
識別子タイプ | DOI | |||||||||||||||||||||||||||||
関連識別子 | https://doi.org/10.1063/1.5083094 | |||||||||||||||||||||||||||||
日本十進分類法 | ||||||||||||||||||||||||||||||
主題Scheme | NDC | |||||||||||||||||||||||||||||
主題 | 427 | |||||||||||||||||||||||||||||
NCID | ||||||||||||||||||||||||||||||
収録物識別子タイプ | NCID | |||||||||||||||||||||||||||||
収録物識別子 | AA00693547 | |||||||||||||||||||||||||||||
ISSN | ||||||||||||||||||||||||||||||
収録物識別子タイプ | PISSN | |||||||||||||||||||||||||||||
収録物識別子 | 0021-8979 | |||||||||||||||||||||||||||||
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収録物識別子タイプ | EISSN | |||||||||||||||||||||||||||||
収録物識別子 | 1089-7550 | |||||||||||||||||||||||||||||
著作権関連情報 | ||||||||||||||||||||||||||||||
権利情報 | Copyright (c) 2019 Author(s). The following article has been submitted to/accepted by Journal of Applied Physics. After it is published, it will be found at https://aip.scitation.org/journal/jap. | |||||||||||||||||||||||||||||
出版タイプ | ||||||||||||||||||||||||||||||
出版タイプ | VoR | |||||||||||||||||||||||||||||
出版タイプResource | http://purl.org/coar/version/c_970fb48d4fbd8a85 | |||||||||||||||||||||||||||||
査読の有無 | ||||||||||||||||||||||||||||||
値 | yes | |||||||||||||||||||||||||||||
連携ID | ||||||||||||||||||||||||||||||
7572 |