What Can We Learn from Comparison between Cuprates and He Films ? : Phase Separation and Fluctuating Superfluidity
نویسنده
چکیده
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 2dimensional superfluid density and superfluid transition temperature in thin films of He in non-porous or porous media, and He/He 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 He/He; and (2) pair (boson) formation and fluctuating superconductivity occur at separate temperatures above Tc in the underdoped region.
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