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Strukturelle und dynamische Eigenschaften der Vortex-Materie in Hochtemperatur-Supraleitern

Strukturelle und dynamische Eigenschaften der Vortex-Materie in Hochtemperatur-Supraleitern

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BLASIUS, Thomas, 1999. Strukturelle und dynamische Eigenschaften der Vortex-Materie in Hochtemperatur-Supraleitern

@phdthesis{Blasius1999Struk-5327, title={Strukturelle und dynamische Eigenschaften der Vortex-Materie in Hochtemperatur-Supraleitern}, year={1999}, author={Blasius, Thomas}, address={Konstanz}, school={Universität Konstanz} }

2011-03-24T14:54:59Z deu Structural and dynamic properties of the vortex-matter in high temperature superconductors Blasius, Thomas Strukturelle und dynamische Eigenschaften der Vortex-Materie in Hochtemperatur-Supraleitern deposit-license application/pdf 2011-03-24T14:54:59Z In this work a model of the vortex-matter in strongly anisotropic cuprate high temperature<br />superconductors based on their specific structural and electronic properties is presented.<br />After a brief introduction of the crystal growth techniques and the characterisation methods of<br />the investigated Bi_2Sr_2CaCu_2O_(8+delta) (Bi-2212) single crystals, the major part of this<br />work is focussed on vortex-matter investigations and the corresponding experimental results.<br /><br />Information on the vortex dynamics and pinning properties of the vortex-state has been<br />obtained from magnetisation measurements. Four different vortex-phases have been<br />identified as a function of temperature and external field. From muon-spin rotation experiments,<br />the underlying vortex-structures (flux-line lattice, quasi-2D vortex-glass, flux-line liquid<br />and pancake liquid) have been successfully determined for the first time. Furthermore, an<br />universal H-T phase diagram of the vortex-matter in Bi-2212 has been obtained by scaling the<br />magnetic field with a characteristic field H*. Such a scaling behaviour strongly suggests that the<br />static and dynamic properties of the vortex-matter are mainly driven by the anisotropy of the<br />cuprate high temperature superconductors and the pinning strength of the pancake vortices.<br />Finally, the characteristics of magnetic flux-front penetration has been investigated as a<br />function of temperature by magnetio-optic experiments. The various vortex-phases here<br />display strongly different flux-front mobility. Blasius, Thomas 1999

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