Impact of pseudo-gap states on the pinning energy and irreversibility field of high temperature superconductors

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Abstract

The existence of pseudo-gap states at energies larger than the coherence energy scale is shown to be at the origin of the difficulties encountered in achieving strong vortex pinning in the high Tc cuprates. Reduction or elimination of the pseudogap states by overdoping is effective in increasing the condensation energy and the irreversibility field. In YBa2Cu3O7, a full BCS state, with a single energy scale, can be restored, leading to the highest known irreversibility field and pinning strength. In the bismuthates, the detrimental effect of the pseudo-gap states can only be mitigated to some extent by overdoping.

Original languageEnglish
Article number096108
JournalAPL Materials
Volume2
Issue number9
DOIs
StatePublished - Sep 2014

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