Observation of the Finite Superconducting Gap States in La1.86Sr0.14CuO4-x by Electron Tunneling
1994 年 63 巻 7 号 p. 2653-2657
詳細
1994 年 63 巻 7 号 p. 2653-2657
In order to investigate symmetry of the Cooper pairing in high-Tc superconductors, quasiparticle tunneling studies were carried out by means of micro-break SIS junction which was in situ prepared at the LT-STM/STS stage. For La1.86Sr0.14CuO4-x single crystal, a distinct gap structure with a definite bias range of almost zero conductance level was observed on the tunneling spectrum. This result is essentially different from the spectrum predicted by d-wave theories, and rather suggests s-wave superconductivity.
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