Superconducting Fluctuations, Pseudogap and Phase Diagram in Cuprates

Abstract

We report transport measurements using pulsed magnetic fields to suppress the superconducting fluctuations (SCF) conductivity in a series of YBa_2Cu_3O_(6+x) samples. These experiments allow us altogether to measure the temperature T'c at which SCF disappear, and the pseudogap temperature T*. While the latter are consistent with previous determinations of T*, we find that T'c is slightly larger than similar data taken by Nernst measurements. A careful investigation near optimal doping shows that T* becomes smaller than T'c, which is an unambiguous evidence that the pseudogap cannot be assigned to preformed pairs. Studies of the incidence of disorder on both T'c and T* allow us to propose a phase diagram including disorder which explains most observations done in other cuprate families, and to discuss the available knowledge on the pseudogap line in the phase diagram.

New version with minor corrections

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• Effective SU(2) theory for the pseudogap state
• Coexistence of the superconducting energy gap and pseudogap above and below the transition temperature of superconducting cuprates
• Locating the pseudogap closing point in cuprate superconductors: absence of entrant or reentrant behavior
• Spin Dynamics at the Mott Transition and in the Metallic State of the Cs_{3}C_{60} Superconducting Phases
• Antagonistic effects of nearest-neighbor repulsion on the superconducting pairing dynamics in the doped Mott insulator regime
• Three energy scales characterizing the competing pseudogap state, the incoherent, and the coherent superconducting state in high-Tc cuprates
• Electronic Raman Scattering in copper oxide Superconductors: Understanding the Phase Diagram
• Origin of the Pseudogap in High-Temperature Cuprate Superconductors
• Disparity of superconducting and pseudogap scales in low-Tc Bi-2201 cuprates
• Equivalent dynamical complexity in a many-body quantum and collective human system
• Doping Dependencies of Onset Temperatures for the Pseudogap and Superconductive Fluctuation in Bi${}_2$Sr${}_2$CaCu${}_2$O${}_{8+\delta }$, Studied from both In-Plane and Out-of-Plane Magnetoresistance Measurements
• Universal relationship between the energy scales of the pseudogap phase, the superconducting state and the charge density wave order in copper oxide superconductors
• The conductivity and the magnetization around Tc in optimally-doped YBa${}_2$Cu${}_3$O${}_{7-\delta }$ revisited: quantitative analysis in terms of fluctuating superconducting pairs
• Incoherent superconductivity well above $T_c$ in high-$T_c$ cuprates - harmonizing the spectroscopic and thermodynamic data
• 17O-NMR Knight shift study of the interplay between superconductivity and pseudogap in (Ca_xLa_{1-x})(Ba_{1.75 - x}La_{0.25 + x})Cu_3O_y
• Pseudo-spin Skyrmions in the Phase Diagram of Cuprate Superconductors
• Current-current Fermi-liquid corrections to the superconducting fluctuations on conductivity and diamagnetism
• Mean-field thermodynamic quantum time-space crystal: spontaneous breaking of time-translation symmetry in a macroscopic fermion system
• Influence of electron irradiation on fluctuation conductivity and pseudogap in $YB{a}_{2}C{u}_3{O}_{7-\delta }$ single crystals
• Influence of strong electron irradiation on fluctuation conductivity and pseudogap in YBa${}_2$Cu${}_3$O${}_7$--$\delta$ single crystals
• Charge and current orders in the spin-fermion model with overlapping hot spots
• From Friedel oscillations and Kondo effect to the pseudogap in cuprates
• Origin of positive out-of-plane magnetoconductivity in overdoped Bi${}_{1.6}$Pb${}_{0.4}$Sr${}_2$CaCu${}_{1.96}$Fe${}_{0.04}$O${}_{8+\delta }$
• High Field determination of superconducting fluctuations in high-Tc cuprates
• Reply to Comment on "High-field studies of superconducting fluctuations in high-Tc cuprates: Evidence for a small gap distinct from the large pseudogap" by M.V. Ramallo et al
• Precursor superconducting effects in the optimally doped YBa${}_2$Cu${}_3$O${}_{7-\delta }$ superconductor: the confrontation between superconducting fluctuations and percolative effects revisited
• Hydrostatic pressure effect on the pseudogap in Y0.77Pr0.23Ba2Cu3O7-δsingle crystals