Superconducting Puddles and "Colossal'' Effects in Underdoped Cuprates

Details Superconducting Puddles and "Colossal'' Effects in Underdoped Cuprates Superconducting Puddles and "Colossal'' Effects in Underdoped Cuprates

2004-01-23

arxiv.org/abs/cond-mat/0401474v2

Phys. Rev. B 71, 014514 (2005)

Physics

Condensed Matter

Superconductivity

RevTeX 4, revised expanded version, 8 pages, 8 figures

Scientific paper

10.1103/PhysRevB.71.014514

Phenomenological models for the antiferromagnetic (AF) vs. d-wave superconductivity competition in cuprates are studied using conventional Monte Carlo techniques. The analysis suggests that cuprates may show a variety of different behaviors in the very underdoped regime: local coexistence or first-order transitions among the competing orders, stripes, or glassy states with nanoscale superconducting (SC) puddles. The transition from AF to SC does not seem universal. In particular, the glassy state leads to the possibility of "colossal'' effects in some cuprates, analog of those in manganites. Under suitable conditions, non-superconducting Cu-oxides could rapidly become superconducting by the influence of weak perturbations that align the randomly oriented phases of the SC puddles in the mixed state. Consequences of these ideas for thin-film and photoemission experiments are discussed.

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