Interlayer tunnelling in Bi2Sr2CaCu2O8+δ single crystals |
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Authors: | Philip J. Thomas Jon C. Fenton Guang Yang Colin E. Gough |
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Affiliation: | Superconductivity Research Group, University of Birmingham, Edgbaston, Birmingham B15 2TT, UK |
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Abstract: | We present measurements of the intrinsic quasi-particle conductivity along the c-axis of 2212-BSCCO single-crystal mesa structures in the superconducting and normal states. Direct measurement of the mesa temperature enables corrections to be made for self-heating and permits the acquisition of reliable I–V characteristics over a wide range of temperatures and voltages. Unlike a conventional superconductor, there is no evidence for any change in the quasi-particle conductivity at Tc, consistent with precursor pairing of electrons in the normal state. At low temperatures the initial low-voltage linear conductivity exhibits a T2 dependence, approaching a limiting value at zero temperature. |
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Keywords: | c-axis transport Intrinsic Josephson effects Bi-2212 Out-of-plane conductivity |
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