Novel Electronic State and Superconductivity in the Electron-Doped High-Tc T'-Superconductors

Abstract

In this review article, we show our recent results relating to the undoped (Ce-free) superconductivity in the electron-doped high-Tc cuprates with the so-called T' structure. For an introduction, we briefly mention the characteristics of the electron-doped T'-cuprates, including the reduction annealing, conventional phase diagram and undoped superconductivity. Then, our transport and magnetic results and results relating to the superconducting pairing symmetry of the undoped and underdoped T'-cuprates are shown. Collaborating spectroscopic and nuclear magnetic resonance results are also shown briefly. It has been found that, through the reduction annealing, a strongly localized state of carriers accompanied by an antiferromagnetic pseudogap in the as-grown samples changes to a metallic and superconducting state with a short-range magnetic order in the reduced superconducting samples. The formation of the short-range magnetic order due to a very small amount of excess oxygen in the reduced superconducting samples suggests that the T'-cuprates exhibiting the undoped superconductivity in the parent compounds are regarded as strongly correlated electron systems, as well as the hole-doped high-Tc cuprates. We show our proposed electronic structure model to understand the undoped superconductivity. Finally, unsolved future issues of the T'-cuprates are discussed.

arXiv comment13 pages, 8 figures

References in corpus (38)

• Conventional superconductivity at 203 K at high pressures
• Superconductivity and Phase Diagram in the Iron-based Arsenic-oxides ReFeAsO1-delta (Re = rare earth metal) without F-Doping
• Progress and perspectives on the electron-doped cuprates
• Doping dependence of an n-type cuprate superconductor investigated by ARPES
• Charge ordering in the electron-doped superconductor Nd2-xCexCuO4
• Evidence for a quantum phase transition in the electron-doped cuprate Pr2-xCexCuO4+d from Hall and resistivity measurements
• Magnetic neutron scattering in hole doped cuprate superconductors
• Strength of Correlations in electron and hole doped cuprates
• Persistent spin excitations in doped antiferromagnets revealed by resonant inelastic light scattering
• Commensurate spin dynamics in the superconducting state of an electron-doped cuprate superconductor
• Angle-Resolved Photoemission Spectroscopy of the Antiferromagnetic Superconductor Nd1.87Ce0.13CuO4: Anisotropic Spin-Correlation Gap, Pseudogap, and the Induced Quasiparticle Mass Enhancement
• New class of T-prime-structure cuprate superconductors
• Microwave Electrodynamics of Electron-Doped Cuprate Superconductors
• Mott Transitions and d-wave Superconductivity in Half-Filled-Band Hubbard Model on Square Lattice with Geometric Frustration
• Microscopic annealing process and its impact on superconductivity in T'-structure electron-doped copper oxides
• Magnetic and superconducting phase diagram of electron-doped Pr${}_{1-x}$LaCe${}_x$CuO${}_4$
• Suppression of the antiferromagnetic pseudogap in the electron-doped high-temperature superconductor by "protect annealing"
• Phase Decomposition and Chemical Inhomogeneity in Nd2-xCexCuO4
• Muon-spin-relaxation and magnetic-susceptibility studies of the effects of nonmagnetic impurities on the Cu-spin dynamics and superconductivity in La_2-x_Sr_x_Cu_1-y_Zn_y_O_4_ around x = 0.115
• Evolution of the electronic state through the reduction annealing in electron-doped Pr_1.3-x_La_0.7_Ce_x_CuO_4+delta_ (x=0.10) single crystals: Antiferromagnetism, Kondo effect and superconductivity
• Kondo effect in underdoped n-type superconductors
• Generic phase diagram of "electron-doped" T' cuprates
• High-field Hall resistivity and magnetoresistance in electron-doped Pr_2-xCe_xCuO_{4-δ}
• Competing ferromagnetism in high temperature copper oxide superconductors
• Cu-spin dynamics in the overdoped regime of La_2-x_Sr_x_Cu_1-y_Zn_y_O_4_ probed by muon spin relaxation
• Superfluid density of high-Tc cuprate systems: implication on condensation mechanisms, heterogeneity and phase diagram
• Distribution of electrons and holes in cuprate superconductors as determined from ${}^{17}$O and ${}^{63}$Cu nuclear magnetic resonance
• Effects of Zn and Ni substitution on the Cu-spin dynamics and superconductivity in La_2-x_Sr_x_Cu_1-y_(Zn,Ni)_y_O_4_ with x=0.15-0.20 studied by the muon spin relaxation and magnetic susceptibility
• Direct Search for a Ferromagnetic Phase in a Heavily Overdoped Nonsuperconducting Copper Oxide
• Thermal Conductivity of Pr_{1.3-x}La_{0.7}Ce_xCuO_4 Single Crystals and Signatures of Stripes in an Electron-Doped Cuprate
• Optical determination of the superconducting energy gap in electron-doped Pr_{1.85}Ce_{0.15}CuO_4
• Strong electron correlation behind the superconductivity in Ce-free and Ce-underdoped high-Tc T'-cuprates
• New superconduting cuprates with no effective doping: T'-(La3+)2-x(RE3+)xCuO4
• Asymmetry of Superconductivity in Hole- and Electron-doped Cuprates: Explanation within Two-Particle Self-Consistent Analysis for the Three-Band Model
• Bulk superconductivity in undoped T'-La${}_{1.9}$Y${}_{0.1}$CuO${}_4$ probed by muon spin rotation
• Optical study of superconducting Pr${}_2$CuO${}_x$ with $x\simeq 4$
• Charge transfer gap for T'-RE2CuO4 and T-La2CuO4 as estimated from Madelung potential calculations
• Pairing Symmetry Studied from Impurity Effects in the Undoped Superconductor T'-La${}_{1.8}$Eu${}_{0.2}$CuO${}_4$

Cited by in corpus (14)

• The Valence Transition Model of Pseudogap, Charge-Order and Superconductivity in Electron- and Hole-Doped Copper Oxides
• Extended superconducting dome of electron-doped cuprates after protect annealing revealed by ARPES
• Anisotropic dressing of electrons in electron-doped cuprate superconductors
• Vortex Dynamics and Phase Diagram in the Electron Doped Cuprate Superconductor Pr${}_{0.87}$LaCe${}_{0.13}$CuO${}_4$
• Electron-Doping Effect on Tc in the Undoped (Ce-Free) Superconductor T'-La1.8Eu0.2CuO4 Studied by the Fluorine Substitution for Oxygen
• Oxidation annealing effects on the spin-glass-like magnetism and appearance of superconductivity in T*-type La${}_{1-x/2}$Eu${}_{1-x/2}$Sr${}_x$CuO${}_4$ (0.14 $\le x\le$ 0.28)
• Muon spin relaxation study of the spin correlation in the overdoped regime of electron-doped high-Tc cuprate superconductors
• Post-growth annealing effects on charge and spin excitations in Nd${}_{2-x}$Ce${}_x$CuO${}_4$
• Continuously Doping Bi 2 Sr 2 CaCu 2 O 8+δ into Electron-Doped Superconductor by CaH 2 Annealing Method
• Introduction to High-Temperature Superconductivity for Solid State Chemists
• Correlation between the strength of low-temperature T-linear normal-state resistivity and $T_{\mathrm{c}}$ in overdoped electron-doped cuprate superconductors
• Electronic State of T'-Pr${}_{1.3-x}$La${}_{0.7}$Ce${}_x$CuO${}_4$ ($x=0.10$) Studied by Compton Scattering
• Renormalization of dispersion in electron-doped bilayer cuprate superconductors
• Cu-spin Correlation in the Electron-overdoped High-Tc Cuprate Thin Films of La_2-x_Ce_x_CuO_4_ Probed by Low-energy Muons