Tunneling conductance of break junction with the (100) plane fracture surface of Bi sub(2)Sr sub(2)CaCu sub(2)O sub(8)

Using the new method of breaking, the tunnel junctions with the (100) plane fracture surface could be obtained. The observed singularities in conductivity can be explained by tunneling between the different layers (CuO sub(2) arrow right CuO sub(2), sharp peaks at 2 Delta sub(p-p) identical with 64...

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Bibliographic Details
Published in:Journal of low temperature physics 1997-01, Vol.107 (5-6), p.511-516
Main Authors: Akimenko, Alexandre I, Kita, Toshiyuki, Yamasaki, Junji, Gudimenko, Vasilii A
Format: Article
Language:English
Subjects:
Crystal orientation
Electron tunneling
Thermal effects
Tunnel junctions
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Summary:Using the new method of breaking, the tunnel junctions with the (100) plane fracture surface could be obtained. The observed singularities in conductivity can be explained by tunneling between the different layers (CuO sub(2) arrow right CuO sub(2), sharp peaks at 2 Delta sub(p-p) identical with 64 plus or minus 2 mV; CuO sub(2) arrow right BiO, peaks at 100-140 mV; BiO arrow right BiO, wide maxima at about 250 mV). The tunneling spectra measured at T identical with 4.2-100 K show that a shift of the 2 Delta sub(p-p) peak to lower biases is much stronger (from 64 to 37 mV) than the BCS prediction at T/T sub(c) less than or equal to 0.7. At higher T (up to T sub(c) approximately 87 K) the changes of the spectra look like those expected for gapless superconductivity in agreement with the ARPES data for a-direction.
ISSN:0022-2291