What can we learn from comparison between cuprates and He films ? : phase separation and fluctuating superfluidity

Abstract

In the underdoped, overdoped, Zn-doped or stripe-forming regions of high-$T_c$ cuprate superconductors (HTSC), the superfluid density $n_s/m^{\ast }$ at $T\to 0$ shows universal correlations with $T_c$. 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 $T_c$ in the underdoped region.

8 pages, 5 figures. Invited paper presented at the third international conference on stripes and high-Tc superconductivity (STRIPE-2000), Sept. 25-30th, 2000, Rome, Italy. To be published in the International Journal of Modern Physics B

Cited by in corpus (9)

• Muon spin relaxation studies of incommensurate magnetism and superconductivity in stage-4 La${}_2$CuO${}_{4.11}$ and La${}_{1.88}$Sr${}_{0.12}$CuO${}_4$
• Microscopic phase separation in the overdoped region of high-Tc cuprate superconductors
• Hall effect in underdoped GdBa2Cu3O7-d thin films: evidence for a crossover line in the pseudogap regime
• Developments in the negative-U modelling of the cuprate HTSC systems
• Novel results in STM, ARPES, HREELS, Nernst, neutron, Raman, and isotope substitution experiments and their relation to bosonic modes and charge inhomogeneity, from perspective of negative-Ueff boson-fermion modelling of HTSC
• Structural matters in HTSC; the origin and form of stripe organization and checker boarding
• Superconducting order parameter in heavily overdoped $B{i}_{2}S{r}_{2}CaC{u}_2{O}_{8+\delta }$: a global quantitative analysis
• Simple Model for the Variation of Superfluid Density with Zn Concentration in YBCO
• On properly integrating the electronic Raman and optical infra-red spectra of HTSC cuprate materials