Study on spin-triplet high-temperature superconducting cooper pairs

自旋三重态高温超导铜对的研究

• 批准号: 23656214
• 负责人: ASANO Hidefumi
• 金额: $ 2.5万
• 依托单位: Nagoya University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Challenging Exploratory Research
• 财政年份: 2011
• 资助国家: 日本
• 起止时间: 2011 至 2012
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-23656214/
• 关键词: 超伝導; スピン三重項; スピン3重項

To realize peculiar spin-triplet high-temperature superconducting states, we have investigated preparation and electrical properties of hetero-junctions with spin-singlet oxide, or nitride superconductors and magnetic materials.Infinite-layer oxide superconducting Sr0.9La0.1CuO2 can be successfully obtained in a-axis oriented thin films, which are favorable for the control of the junction interfaces owing to their long superconducting coherence length. Hetero epitaxial growth between a-axis superconducting Sr0.9La0.1CuO2 films and ferromagnetic Sr2CrReO6 or antiferromagnetic SrLaVMoO6 films was also achieved.The effect of insertion of ultra-thin magnetic layers in NbN superconducting junctions was examined. The junctions with a 1 nm-thick ferromagnetic CoFe insertion layer exhibited asymmetric Fraunhofer patterns with a minimum of Josephson supercurrent at zero field, which suggests the possibility of existence of spin-triplet cooper pairs due to magnetic inhomogeneity of junction interfaces.

为了实现奇特的自旋三重态高温超导态，我们研究了自旋单线态氧化物或氮化物超导体与磁性材料异质结的制备和电学性能，成功获得了无限层氧化物超导Sr0.9La0.1CuO2在a轴取向薄膜中，由于其超导相干长度长，有利于结界面的控制。还实现了a轴超导Sr0.9La0.1CuO2薄膜与铁磁Sr2CrReO6或反铁磁SrLaVMoO6薄膜之间的异质外延生长。研究了在NbN超导结中插入超薄磁层的效果。具有 1 nm 厚的铁磁 CoFe 插入层的结表现出不对称的夫琅和费图案，在零场下约瑟夫森超电流最小，这表明由于结界面的磁不均匀性而存在自旋三重态铜对的可能性。

项目成果

Ferromagnetic Schottky junctions using diamond semiconductors

• DOI: 10.3379/msjmag.1206r006
• 发表时间: 2012-05
• 期刊: Journal of The Magnetics Society of Japan
• 作者: T. Soumiya;K. Ueda;N. Fukatani;T. Miyawaki;H. Asano

Structural and electrical properties of (111) oriented half-Heusler LaPtBi thin films

(111)取向半Heusler LaPtBi薄膜的结构和电学性质

• 发表时间: 2012
• 作者: N. Sugimoto;Y. Niimi;T. Miyawaki;T. Yoshihara;N. Fukatani;K. Ueda;N. Tanaka;and H. Asano
• 通讯作者: and H. Asano

規則型二重ペロブスカイトSrLaVMoO6のスピン分極率

有序双钙钛矿SrLaVMoO6的自旋极化率

• 发表时间: 2013
• 作者: 新野貴士;三宝勝利;松島宏行;宮脇哲也;植田研二;浅野秀文
• 通讯作者: 浅野秀文

High-temperature characteristics of diamond Schottky diodes above 600°C

金刚石肖特基二极管600℃以上高温特性

• 发表时间: 2012
• 作者: K. Ueda;K. Kawamoto;T. Soumiya;and H. Asano
• 通讯作者: and H. Asano

Growth and properties of epitaxial Fe2CrSi / AFM Ru2MnGe Heusler multilayers

外延 Fe2CrSi / AFM Ru2MnGe Heusler 多层膜的生长和性能

• 发表时间: 2012
• 作者: K. Inagaki;N. Fukatani;T. Miyawaki;K. Ueda;and H. Asano
• 通讯作者: and H. Asano