Theory of reduced superfluid density in underdoped cuprate superconductors

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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Disorder and superfluid density in overdoped cuprate superconductors

Physical Review B ◽

10.1103/physrevb.96.024501 ◽

2017 ◽

Vol 96 (2) ◽

Cited By ~ 30

Author(s):

N. R. Lee-Hone ◽

J. S. Dodge ◽

D. M. Broun

Keyword(s):

Cuprate Superconductors ◽

Superfluid Density

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The charge-density-wave signature on the superfluid density of cuprate superconductors

Journal of Physics Condensed Matter ◽

10.1088/1361-648x/abd812 ◽

2021 ◽

Author(s):

Evandro Vidor Lins de Mello

Keyword(s):

Charge Density ◽

Charge Density Wave ◽

Cuprate Superconductors ◽

Density Wave ◽

Superfluid Density ◽

Wave Signature

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DOPING AND TEMPERATURE DEPENDENCE OF SUPERFLUID DENSITY IN KINETIC ENERGY DRIVEN CUPRATE SUPERCONDUCTORS

Modern Physics Letters B ◽

10.1142/s0217984910025218 ◽

2010 ◽

Vol 24 (29) ◽

pp. 2845-2854

Author(s):

ZHEYU HUANG ◽

HUAISONG ZHAO ◽

SHIPING FENG

Keyword(s):

Transition Temperature ◽

Kinetic Energy ◽

Temperature Dependence ◽

Low Temperatures ◽

Cuprate Superconductors ◽

Superfluid Density ◽

Linear Temperature Dependence ◽

Superconducting Transition ◽

Zero Temperature ◽

Linear Temperature

Within the kinetic energy driven superconducting mechanism, the doping and temperature dependence of the superfluid density in cuprate superconductors is studied throughout the superconducting dome. It is shown that the superfluid density shows a crossover from the linear temperature dependence at low temperatures to a nonlinear one in the extremely low temperatures. In analogy to the dome-like shape of the doping dependent superconducting transition temperature, the maximal zero-temperature superfluid density occurs around the critical doping δ ≈ 0.195, and then decreases in both lower doped and higher doped regimes.

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