a−b Plane Anisotropy of the Superconducting Gap in Bi2Sr2CaCu2O8: Scanning Tunneling Microscope Spectroscopy
K. Suzuki, K. Ichimura, K. Nomura, S. Takekawa
DOI 10.1103/PhysRevLett.83.616 · Physical Review Letters
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Abstract
We have carried out electron tunneling spectroscopy on Bi2Sr2CaCu2O8 single crystals with use of STM at 4.2 K. The tunneling differential conductance in the superconducting gap was observed with varying tunneling direction in the a−b plane. Tunneling spectra observed along directions intermediate between Cu-O and Cu-Cu directions are well fitted with the dx2−y2 wave model, taking into account the k dependence of the tunneling transition probability. This result strongly indicates that the superconducting gap has the dx2−y2 wave symmetry with line nodes along the Cu-Cu direction.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Bi2Sr2CaCu2O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 87 | Pressure not reported | midpoint |
| Bi2Sr2CaCu2O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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