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Evidence for charged critical fluctuations in underdoped Y-123

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Preprint
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arXiv ID: cond-mat/0406691
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arXiv
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Abstract

We report and analyze in-plane penetration depth measurements in YBa2Cu3O7-x taken close to the critical temperature Tc. In underdoped YBa2Cu3O6:59 we find consistent evidence for charged critical behavior. Noting that the effective dimensionless charge scales as 1/sqrt(Tc), this new critical behavior should be generically observable in suitably underdoped cuprates.

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