What can we learn from comparison between cuprates and He films ? : phase separation and fluctuating superfluidity
Y. J. Uemura
Abstract
In the underdoped, overdoped, Zn-doped or stripe-forming regions of high-Tc cuprate superconductors (HTSC), the superfluid density ns/m* at T 0 shows universal correlations with Tc. Similar strong correlations exist between 2-dimensional superfluid density and superfluid transition temperature in thin films of 4He in non-porous or porous media, and 4He/3He film adsorbed on porous media. Based on analogy between HTSC and He film systems, we propose a model for cuprates where: (1) the overdoped region is characterized by a phase separation similar to 4He/3He; and (2) pair (boson) formation and fluctuating superconductivity occur at separate temperatures above Tc in the underdoped region.
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