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 pseudo-gap 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.
Highlights
There has been recently increasing interest in the applications of High Temperature Superconductor to very high field magnets, a possibility that arises because of their very high critical fields
It had already been shown that the condensation energy is reduced in the underdoped regime.[8]
Because the transition from the normal state to the superconducting one is of the second order, the condensation energy near the transition is given by the Ginzburg Landau theory as
Summary
There has been recently increasing interest in the applications of High Temperature Superconductor to very high field magnets, a possibility that arises because of their very high critical fields. Impact of pseudo-gap states on the pinning energy and irreversibility field of high temperature superconductors
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