Microscopic phase separation in the overdoped region of high-Tc cuprate superconductors

Abstract

We propose a phenomenological model for high-$T_c$ superconductors (HTSC) assuming: (1) a microscopic phase separation between superconducting and normal-metal areas in the overdoped region; and (2) existence of a homogeneous superconducting phase only below the pseudo-gap $T^{\ast }$ line, which shows a sharp reduction towards $T^{\ast }\sim 0$ at a mildly overdoped critical concentration $x_c$. This model explains anomalous doping and temperature dependences of $n_s/m^{\ast }$ (superconducting carrier density / effective mass) observed in several overdoped HTSC systems. We point out an analogy to superfluid ${}^4$He/${}^3$He films, and discuss an energetic origin of microscopic phase separation.

5 pages, 4 figures

References in corpus (1)

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

Cited by in corpus (18)

• Magnetic neutron scattering in hole doped cuprate superconductors
• 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${}_4$
• Disappearance of antiferromagnetic spin excitations in over-doped La${}_{2-x}$Sr${}_x$CuO${}_4$
• Strong charge fluctuations manifested in the high-temperature Hall coefficient of high-T_c cuprates
• A model for the phase separation controlled by doping and the internal chemical pressure in different cuprate superconductors
• Metallic mean-field stripes, incommensurability and chemical potential in cuprates
• Fermiology and electronic homogeneity of the superconducting overdoped cuprate Tl-2201 revealed by quantum oscillations
• Electronic specific heat and low energy quasiparticle excitations in superconducting state of $L{a}_{2-x}S{r}_{x}Cu{O}_4$ single crystals
• Superconductor-to-Metal Quantum Phase Transition in Overdoped $L{a}_{2-x}S{r}_{x}Cu{O}_4$
• Superfluid density of high-Tc cuprate systems: implication on condensation mechanisms, heterogeneity and phase diagram
• Superfluid Density and Field-Induced Magnetism in Ba(Fe1-xCox)2As2 and Sr(Fe1-xCox)2As2 Measured with Muon Spin Relaxation
• Twin spin/charge roton mode and superfluid density: primary determining factors of $T_c$ in high-$T_c$ superconductors observed by neutron, ARPES, and $\mu$SR
• Strongly-overdoped La${}_{2-x}$Sr${}_x$CuO${}_4$: Evidence for Josephson-coupled grains of strongly-correlated superconductor
• Microwave conductivity and superfluid density in strongly overdoped Tl2201
• Global Phase Diagram of the High Tc Cuprates
• Anomalously Sharp Superconducting Transitions in Overdoped $L{a}_{2-x}S{r}_{x}Cu{O}_4$ Films
• From non-metal to strange metal at the stripe-percolation transition in La${}_{2-x}$Sr${}_x$CuO${}_4$
• High-field muSR studies of superconducting and magnetic correlations in cuprates above Tc