Energy Gap Measurement Made on “Clean” and Oriented YBa2Cu3O7-δ Surfaces
Superconductive energy gap of YBa2Cu3O7-δ is measured in a novel broken film edge junction. (001), (103) and (110) oriented films are broken in a cryogenic environment along the appropriate directions together with the SrTiO3 substrate. Pb electrode is brought close in situ to the clean broken film edge. The normalized energy gap 2Δ(0)/kBTc measured in the direction along and perpendicular to the Cu-O plane are found to be 5.9±0.2 and 3.6±0.2 respectively. These values are independent of the variation in the values of Tc within the examined range of 40K~90K. The gap difference structure at ΔYBCO-Δpb is observed which help identifying the value of energy gap of the oxide superconductor unambiguously. Identification of the gap energies in BiSrCaCuO system by the same technique was attempted.
KeywordsTunnel Junction Oxide Superconductor Josephson Current Film Edge Tunneling Surface
Unable to display preview. Download preview PDF.
- A. Barone, Physica C, 153–155, 1712 (1988)Google Scholar
- J. Fujita, T. Yoshitake, A. Kamijyo, H. Igarashi and T. Satoh, to be published, Extended Abstracts MRS Spring Meeting (1988)Google Scholar
- J. Takada, H. Mazaki, T. Terashima, K. Iijima, K. Yamamoto, K. Hirata and Y. Bando, Extended Abstracts of the 20th Conference on Solid State Devices and Materials, Tokyo, 455 (1988)Google Scholar