Fabrication of d-dot by using high temperature oxide superconductor BSCCO single crystal and creation of logic circuit

2014 Fiscal Year Final Research Report

• Project/Area Number: 23540422
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Condensed matter physics II
• Research Institution: Osaka Prefecture University
• Principal Investigator: KAWAMATA Shuichi 大阪府立大学, 工学(系)研究科(研究院), 准教授 (50211868)
• Co-Investigator(Renkei-kenkyūsha): KATO Masaru 大阪府立大学, 大学院工学研究科, 准教授 (90204495) ; ISHIDA Takekazu 大阪府立大学, 大学院工学研究科, 教授 (00159732) ; KAWAMURA Yuichi 大阪府立大学, 大学院工学研究科, 教授 (80275289)
• Project Period (FY): 2011-04-28 – 2015-03-31
• Keywords: 超伝導ナノ構造 / 超伝導接合 / 超伝導論理デバイス / 超伝導磁束量子 / 銅酸化物超伝導体

Outline of Final Research Achievements

The d-dot is a composite structure where a d-wave superconductor is embedded in an s-wave superconductor. In this research, we used a high temperature cuprate superconductor BSCCO single crystal as the d-wave superconductor and Pb as the s-wave superconductor. The d-dot was fabricated by using photolithography technique and ion-milling method and so on. Magnetic flux distribution was measured by using a scanning SQUID magnetometer. The spontaneous half flux quantum due to the interference between the d- and s-wave superconductors has been observed at the corners of the d-dot. This observation crucially proves that the superconducting order parameter of the BSCCO has the d-wave symmetry.

Free Research Field

物性物理学（超伝導・磁性に関する実験）