Point-contact electron tunneling into the high-<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi>T</mml:mi></mml:mrow><mml:mrow><mml:mi>c</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math>superconductor Y-Ba-Cu-O
M. D. KirkDepartment of Applied Physics, Stanford University, Stanford, California 94305D. P. E. SmithDepartment of Applied Physics, Stanford University, Stanford, California 94305David B. MitziDepartment of Applied Physics, Stanford University, Stanford, California 94305Junjie SunDepartment of Applied Physics, Stanford University, Stanford, California 94305D. J. WebbDepartment of Applied Physics, Stanford University, Stanford, California 94305K. CharDepartment of Applied Physics, Stanford University, Stanford, California 94305M. R. HahnDepartment of Applied Physics, Stanford University, Stanford, California 94305M. NaitoDepartment of Applied Physics, Stanford University, Stanford, California 94305Byeong‐Yun OhDepartment of Applied Physics, Stanford University, Stanford, California 94305M. R. BeasleyDepartment of Applied Physics, Stanford University, Stanford, California 94305T. H. GeballeDepartment of Applied Physics, Stanford University, Stanford, California 94305R. H. HammondDepartment of Applied Physics, Stanford University, Stanford, California 94305A. KapitulnikDepartment of Applied Physics, Stanford University, Stanford, California 94305C. F. QuateDepartment of Applied Physics, Stanford University, Stanford, California 94305
1987lv
ABI
Annotatsiya
We report results of a study of electron tunneling into bulk samples of the new high-${T}_{c}$ superconductor Y-Ba-Cu-O using point-contact tunneling. Based on a superconductive tunneling interpretation, the results show exceptionally large energy gaps in these materials (roughly 2\ensuremath{\Delta}=100 meV), implying 2\ensuremath{\Delta}/${k}_{C}$${T}_{c}$\ensuremath{\sim}13. Similar values were found previously by us for La-Sr-Cu-O. We also see Structure in the I-V curves similar to that seen in La-Sr-Cu-O. On the basis of the asymmetries observed in the I-V characteristics, we believe that the natural tunneling barrier on this material is of the Schottky type.
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