Progressive disappearance of the c-axis tunneling barrier in Bi2Sr2CaCu2O8+x single crystals near T-c
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- Title
- Progressive disappearance of the c-axis tunneling barrier in Bi2Sr2CaCu2O8+x single crystals near T-c
- Authors
- Chang, HS; Doh, YJ; Lee, HJ
- Date Issued
- 2001-08
- Publisher
- KOREAN PHYSICAL SOC
- Abstract
- We observed an enhancement of the differential conductance dI/dV around the zero bias in junctions of Au/Bi2Sr2CaCu2O8+x(Bi2212) single crystals near the superconducting transition temperature of Bi2212 crystals with the tunneling current along the c axis. We attribute such an enhancement to an Andreev reflection (AR) between the surface Cu-O bilayer, which is in the normal state, and the next superconducting bilayer below the crystal surface. The continuous evolution from a gap-like depression to the AR peak structure of the dI/dV curves around the zero bias indicates weakening of the barrier strength of the non-superconducting layers between adjacent Cu-O bilayers as the temperature is raised up to T-c. We suggest that the fact can be conveniently used to investigate the possible existence of preformed pairs in the pseudogap state above T-c.
- Keywords
- HIGH-TEMPERATURE SUPERCONDUCTORS; INTRINSIC JOSEPHSON-JUNCTIONS; OVERDOPED BI2SR2CACU2O8+DELTA; ANDREEV REFLECTIONS; PAIRING SYMMETRY; SPECTROSCOPY; TRANSITION; PSEUDOGAP; STATE; YBA2CU3O7-DELTA
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/19444
- ISSN
- 0374-4884
- Article Type
- Article
- Citation
- JOURNAL OF THE KOREAN PHYSICAL SOCIETY, vol. 39, no. 2, page. 344 - 349, 2001-08
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