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Neutron-irradiation effects on the V-I characteristics of YBa₂Cu₃O₇₋δ twinned crystals: Linking transport results in a variety of copper oxide superconductors

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  • We have investigated the depinning process of magnetic flux vortices in twinned crystals of YBa₂Cu₃O₇₋δ in intermediate applied magnetic fields parallel to the crystallographic c axis through precise resistivity measurements before and after fast-neutron irradiation. Of particular interest for each field is the power-law dependence of the electric field on current density, E∝Jⁿ, at a well defined temperature which separates a nonlinear region below from a more linear, dissipative region above. We find that n shows a striking dependence on the estimated value of the Larkin-Ovchinnikov length. The relation is not only manifest before and after irradiation but also for a variety of samples, including films, crystals, and at least two copper oxides other than YBa₂Cu₃O₇₋δ.
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  • Brown, B., Roberts, J. M., Tate, J., & Farmer, J. W. (1997). Neutron-irradiation effects on the V-I characteristics of YBa₂Cu₃O₇₋δ twinned crystals: Linking transport results in a variety of copper oxide superconductors. Physical Review B, 55(14), R8713-R8716.
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  • 55
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  • 14
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  • This work was partially supported by the NSF under Contract No. DMR 9408628 and by the Midwest Superconductivity Consortium through D.O.E. Grant No. DE-FG02 90ER45427.
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