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Theses

Couplage interplan dans Bi2Sr2CaCu2O8+∂ : effet du désordre et du champ magnétique

Abstract : The measurement of the Josephson plasma resonance allows one to accurately characterise the evolution of the c-axis superfluid density in the underdoped high temperature superconductor Bi2Sr2CaCu2O8+∂ as function of crystalline disorder. A comparison of results presented in this thesis with different theories published in the literature shows that, as opposed to the situation in optiammly doped Bi2Sr2CaCu2O8+∂ , out-of-plane transport of Cooper pairs in the underdoped material is well described by incoherent hopping. While the evolution with disorder of in-plane superconducting properties is well described by the Abrikosov-Gor'kov theory for pair-breaking, the interlayer superfluid density is limited by anisotropic weak (Born limit) scattering of quasiparticles by interlayer impurity states. This result is in agreement with recent interpretations of spatial modulations of the spectroscopic gap in Bi2Sr2CaCu2O8+∂ , attirbuted to the influence of out-of-plane oxygen dopant atoms. As for the properties of the mixed state, it is shown, again using the Josephson Plasma resonance technique, that the application of an in-plane magnetic field component is responsible for enhanced spatial correlations in the liquid of vortex pancakes. This effect is due to the reorganisation of supercurrent surrounding the pancakes. As a result of its characteristic time scale, much smaller than any other timescale in the system, the Josephson Plasma Resonance technique is the only method to probe the structure vortex liquid state.
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Submitted on : Friday, March 19, 2010 - 6:00:16 PM
Last modification on : Friday, July 31, 2020 - 9:24:06 AM
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  • HAL Id : tel-00465554, version 1

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Panayotis Spathis. Couplage interplan dans Bi2Sr2CaCu2O8+∂ : effet du désordre et du champ magnétique. Supraconductivité [cond-mat.supr-con]. Ecole Polytechnique X, 2006. Français. ⟨tel-00465554⟩

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