Gap anisotropy of measured by low-temperature scanning tunneling microscopy
- 1 February 1992
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 45 (5), 2569-2572
- https://doi.org/10.1103/physrevb.45.2569
Abstract
Energy gaps of single-crystal in the c-axis and the ab-plane directions are measured directly by the scanning-tunneling-microscopy method. Due to the short coherence length along the c axis, conductance curves in this direction are seriously smeared and do not fit the conventional BCS density of states. In the ab direction, the shapes of the conductance curves are different from that of c-axis tunneling and show sharper gap features. The energy gap in the ab direction is measured to be 35 meV, which is 10 meV larger than the value in the c-axis direction.
This publication has 15 references indexed in Scilit:
- Giant tunnelling anisotropy in the high- Tc superconductor Bi2Sr2CaCu2O8Nature, 1991
- Detection of an anisotropy of the superconducting gap in Bi2Sr2CaCu2O8+δ single crystals by Raman and tunneling spectroscopyPhysica C: Superconductivity and its Applications, 1991
- Cryogenic Scanning Tunneling Microscopy and Spectroscopy on the Cleaved Surface of Bi-Sr-Ca-Cu-O Down to 4.2 KJapanese Journal of Applied Physics, 1991
- Energy gaps measured by scanning tunneling microscopyPhysical Review B, 1990
- Major normal and superconducting parameters of high-oxidesPhysical Review B, 1990
- Quasiparticle tunneling in Bi-Sr-Ca-Cu-O thin filmsPhysical Review B, 1990
- Energy gaps in Bi-Sr-Ca-Cu-O and Bi-Sr-Cu-O systems by electron tunnelingPhysical Review B, 1989
- Tunneling spectroscopy in Bi2Sr2CaCu2O8: Is the energy gap anisotropic?Solid State Communications, 1989
- Angular dependence of the upper critical field ofPhysical Review B, 1988
- Tunneling Spectroscopy of the 80 K Superconducting Phase of the Bi-Sr-Ca-Cu-O SystemJapanese Journal of Applied Physics, 1988