Development of the realization of superfluid transition temperature of helium

2013 ◽  
Author(s):  
P. Lin ◽  
L. Yu
Keyword(s):  
Transition Temperature ◽  
Superfluid Transition

WHAT CAN WE LEARN FROM COMPARISON BETWEEN CUPRATES AND HE FILMS?: PHASE SEPARATION AND FLUCTUATING SUPERFLUIDITY

2000 ◽  
Vol 14 (29n31) ◽  
pp. 3703-3710 ◽  
Author(s):  
Y. J. UEMURA
Keyword(s):  
Thin Films ◽  
Porous Media ◽  
Phase Separation ◽  
Transition Temperature ◽  
Cuprate Superconductors ◽  
Superfluid Density ◽  
Superfluid Transition ◽  
Strong Correlations ◽  
Underdoped Region

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 4 He in non-porous or porous media, and 4 He /3 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 4 He /3 He ; and (2) pair (boson) formation and fluctuating superconductivity occur at separate temperatures above Tc in the underdoped region.

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