Formation of Superconducting Phase by Laser Quenching

通过激光淬火形成超导相

• 批准号: 61550219
• 负责人: OHSHIMA Shigetoshi
• 金额: $ 1.09万
• 依托单位: TOHOKU UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1986
• 资助国家: 日本
• 起止时间: 1986 至 1987
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-61550219/
• 关键词: Laser quenching; Amorphous; 超伝導薄膜; 超伝導; レーザー

It hase been suggested that metastable superconducting phase would be a high-Tc phase and many investigators have been attemped to get a metastable superconducting phase by several methods. Laser quenching is a good method to get a meta stble phase,because cooling rate is very fast. In this report,we show the laser quenching method,the superconducting properties of films with laser aneealed.(a) V-Si filmA15 V_3Si phase was obtained from amorphous V-Si film by laser quenching. T_conset was about 14 K.(b) V-A1 filmA15 V_3Al,which is metastable phase, was obtained by laser annealing. T_c onset was about 12 K,which is highet value for A15 V_3Al phase now.(c) Nb-Al filmMeta stable A15 Nb_3Al phase was not obtained by laser quenching.After laser annealing,bcc Nb-Al phase was observed.(d) Nb-Si filmAfter laser quenching, fcc Nb_3Si of meta stable phase was obtained,but A 15 Nb_3Si phase was not obtainedIt was found that laser quenching is a good method to get a metastable phase

亚稳超导相可能是高T_c相，许多研究者试图用多种方法来获得亚稳超导相。激光淬火冷却速度快，是获得亚稳定相的一种很好的方法。本文介绍了激光淬火的方法，用激光淬火的方法研究了薄膜的超导性质：(A)用激光淬火的方法从非晶态的V-Si薄膜中获得了V_3Si相。T_COSET约为14K。(B)用激光退火法获得了亚稳相V-Al薄膜。(C)激光淬火没有得到亚稳的A15Nb_3Al相。激光淬火后，观察到了体心立方结构的Nb-Al相。(D)激光淬火后，得到了面心立方结构的亚稳定相Nb_3Si，但没有得到亚稳相A15Nb_3Si。

项目成果

S.Ohshima,T.Shiba,T.Kawanobe and T.Wakiyama: "Superconducting Properties and Phase Analysis of Nb-Si Thin Films Produced by Sputtering" Jpn.J.Appl.Phys.25. 1336-1341 (1986)

S.Ohshima、T.Shiba、T.Kawanobe 和 T.Wakiyama：“溅射生产的 Nb-Si 薄膜的超导特性和相分析”Jpn.J.Appl.Phys.25。

大嶋重利,最上徹,国井誠,脇山徳雄: 応用物理. 54. 252-259 (1985)

Shigetoshi Oshima、Toru Mogami、Makoto Kunii、Norio Wakiyama：应用物理学 54. 252-259 (1985)。