Two-dimensional decoherence effects in superconducting sheets of single crystal Bi sub(2)Sr sub(2)CaCu sub(2)O sub(8+x)

We quantitatively analyze ohmic magnetoresistance of a Bi sub(2)Sr sub(2)CaCu sub(2)O sub(8+x) single crystal in the temperature range 40 K less than or equal to T less than or equal to 76 K and in magnetic fields up to 0.8 T, with an emphasis on the non-Arrhenius high-resistivity data. The unusual...

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Published in:Physica. C, Superconductivity Superconductivity, 1997-01, Vol.277 (3-4), p.203-212
Main Authors: Babic, D, Ivkov, J, Leontic, B
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Ivkov, J
Leontic, B
description We quantitatively analyze ohmic magnetoresistance of a Bi sub(2)Sr sub(2)CaCu sub(2)O sub(8+x) single crystal in the temperature range 40 K less than or equal to T less than or equal to 76 K and in magnetic fields up to 0.8 T, with an emphasis on the non-Arrhenius high-resistivity data. The unusual field dependence of the magnetoresistance at high resistivities is shown to follow a behaviour which is characteristic for decoherence effects in two-dimensional systems. We give semiquantitative arguments which relate the observed behaviour to the magnetic-field-induced breaking of non-dissipative quasiparticle pairs occurring in the mixed state within the isolated double CuO sub(2) sheets. These arguments generalize the approach to the quantum decoherence phenomena, originally developed for T > T sub(c), to T < T sub(c).
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title Two-dimensional decoherence effects in superconducting sheets of single crystal Bi sub(2)Sr sub(2)CaCu sub(2)O sub(8+x)
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