Superconducting Gap and Strong In-Plane Anisotropy in Untwinned YBa2Cu3O7-d

Abstract

With significantly improved sample quality and instrumental resolution, we clearly identify in the (pi,0) ARPES spectra from YBa2Cu3O6.993, in the superconducting state, the long-sought `peak-dip-hump' structure. This advance allows us to investigate the large a-b anisotropy of the in-plane electronic structure including, in particular, a 50% difference in the magnitude of the superconducting gap that scales with the energy position of the hump feature. This anisotropy, likely induced by the presence of the CuO chains, raises serious questions about attempts to quantitatively explain the YBa2Cu3O7-d data from various experiments using models based on a perfectly square lattice.

Phys. Rev. Lett., in press. Revtex, 4 pages, 4 postscript figures embedded in the text

Cited by in corpus (81)

• Angle-resolved photoemission spectroscopy of the cuprate superconductors
• The effect of collective spin-1 excitations on electronic spectra in high-Tc superconductors
• Two-Dimensional Geometry of Spin Excitations in the High Temperature Superconductor YBa2Cu3O6+x
• Indication of Superconductivity at 35 K in Graphite-Sulfur Composites
• Fermi surface fluctuations and single electron excitations near Pomeranchuk instability in two dimensions
• Effect of the magnetic resonance on the electronic spectra of high Tc superconductors
• Admixtures to d-wave gap symmetry in untwinned YBa2Cu3O7 superconducting films measured by angle-resolved electron tunneling
• Electronic structure of the trilayer cuprate superconductor Bi${}_2$Sr${}_2$Ca${}_2$Cu${}_3$O${}_{10+\delta }$
• Universal observation of multiple order parameters in cuprate superconductors
• Renormalized mean-field theory of the neutron scattering in cuprate superconductors
• Evolution of a Metal to Insulator Transition in Ca${}_{2-x}$Na${}_x$CuO${}_2$Cl${}_2$, as seen by ARPES
• "Kinks", Nodal Bilayer Splitting and Interband Scattering in YBCO
• Magnetic excitations and their anisotropy in YBCO: slave-boson mean-field analysis of bilayer t-J model
• Tl2Ba2CuO6+d Brings Spectroscopic Probes Deep Into the Overdoped Regime of the High-Tc Cuprates
• Sum rules and energy scales in the high-temperature superconductor YBa2Cu3O6+x
• A new elliptical-beam method based on time-domain thermoreflectance (TDTR) to measure the in-plane anisotropic thermal conductivity and its comparison with the beam-offset method
• Unified electronic phase diagram for hole-doped high-Tc cuprates
• Coexistence of metallicity and superconductivity in adjacent bilayers of a high-Tc superconductor
• Dynamical electronic nematicity from Mott physics
• Angle-resolved photoemission spectroscopy study of HgBa${}_2$CuO${}_{4+\delta }$
• Odd and even magnetic resonant modes in highly overdoped Bi_2 Sr_2 Ca Cu_2 O_{8+delta}
• Self-doping processes between planes and chains in the metal-to-superconductor transition of YBa2Cu3O6.9
• Bulk and surface low-energy excitations in YBa2Cu3O7-d studied by high-resolution angle-resolved photoemission spectroscopy
• Superconducting coherence peak in the electronic excitations of a single layer cuprate superconductor $B{i}_{2}S{r}_{1.6}L{a}_{0.4}Cu{O}_{6+\delta }$
• Vibronic mechanism of high-Tc superconductivity
• D-wave superconductivity in doped Mott insulators
• Raman study of carrier-overdoping effects on the gap in high-Tc superconducting cuprates
• Mott gap excitations in twin-free YBa2Cu3O7-d (Tc = 93 K) studied by RIXS
• Electronic structure of kinetic energy driven cuprate superconductors
• Distribution of spectral weight in a system with disordered stripes
• Buried double CuO chains in YBa${}_2$Cu${}_4$O${}_8$ uncovered by nano-ARPES
• Influence of collective effects and the d-CDW on electronic Raman scattering in high-T${}_c$ superconductors
• Electronic and phononic Raman scattering in detwinned YBa${}_2$Cu${}_3$O${}_{6.95}$ and Y${}_{0.85}$Ca${}_{0.15}$Ba${}_2$Cu${}_3$O${}_{6.95}$: s-wave admixture to the $d_{x^2-y^2}$-wave order parameter
• Anisotropic spin and charge excitations in superconductors: signature of electronic nematic order
• Superconducting electronic state in optimally doped YBa2Cu3O7-d observed with laser-excited angle-resolved photoemission spectroscopy
• Fermi-liquid based theory for the in-plane magnetic anisotropy in untwinned high-T${}_c$ superconductors
• Developments in the negative-U modelling of the cuprate HTSC systems
• Pseudogap in the chain states of YBCO
• Role of CuO chains in vortex core structure in YBa2Cu3O{7-delta}
• Theory for Inelastic Neutron Scattering in Orthorhombic High-Tc Superconductors
• Electronic structure of kinetic energy driven superconductors in the presence of bilayer splitting
• Tunneling Spectroscopy on c-axis Y{1-x}Ca{x}Ba2Cu3O{7-delta} Thin Films
• Dual character of the electronic structure in YBa2Cu4O8: conduction bands of CuO2 planes and CuO chains
• Theory of (001) surface and bulk states in Y${}_{1-y}$Ca${}_y$Ba${}_2$Cu${}_3$O${}_{7-\delta }$}
• In-plane anisotropy on the transport properties in the modulated Bi_2O_2-based conductors Bi-2212 and Bi-Sr-Co-O
• The electronic pseudogap in optimally doped NCCO
• Central peak in the pseudogap of high T_c superconductors
• Fermi-surface pockets in $YB{a}_{2}C{u}_3{O}_{6.5}$ : A comparison of ab initio techniques
• Superconducting order parameter in heavily overdoped $B{i}_{2}S{r}_{2}CaC{u}_2{O}_{8+\delta }$: a global quantitative analysis
• Phase Separation Models for Cuprate Stripe Arrays
• Anomalous electron spectrum and its relation to peak structure of electron scattering rate in cuprate superconductors
• Excitation of a bosonic mode by electron tunneling into a cuprate superconductor
• Fermi-surface induced modulation in an optimally doped YBCO superconductor
• Evidence for a temperature dependent anisotropy of the superconducting state parameters in underdoped SmBa2Cu3Ox
• High magnetic field studies of the Vortex Lattice structure in YBa2Cu3O7
• Homogeneous superconducting gap in DBCO synthesized by oxide molecular beam epitaxy
• Linking Dynamic and Thermodynamic Properties of Cuprates; an ARPES study of (CaLa)(BaLa)${}_2$Cu${}_3$O${}_y$
• Magnetic field-dependence of the basal-plane superconducting anisotropy in YBa2Cu4O8 from small-angle neutron scattering measurements of the vortex lattice
• London penetration depth in the tight binding approximation: Orthorhombic distortion and oxygen isotope effects in cuprates
• Superconducting materials - a topical overview
• Screening in (d+s)-wave superconductors: Application to Raman scattering
• Influence of impurities on electronic structure in cuprate superconductors
• Friedel oscillations in a two-band Hubbard model for CuO chains
• Renormalization of electrons in bilayer cuprate superconductors
• Flux Phase as a Dynamic Jahn-Teller Phase: Berryonic Matter in the Cuprates?
• Interlayer pair tunneling and gap anisotropy in YBa${}_2$Cu${}_3$O${}_{7-\delta }$
• Effect of CuO chains on the local density of states in the vortex phase of YBa_2Cu_3O_7
• Broken particle-hole symmetry at atomically flat a-axis YBa2Cu3O7-d interfaces
• Superconducting gap of overdoped Tl2Ba2CuO6+d observed by Raman scattering
• Defect and anisotropic gap induced quasi-one-dimensional modulation of local density of states in YBa${}_2$Cu${}_3$O${}_{7-\delta }$
• Magnetic impurity transition in a 'd+s'-wave superconductor
• The enhanced s*-wave component of the superconducting gap in the overdoped HTSC cuprates with orthorhombic distortion
• Bosonic excitation spectra of superconducting $\mathrm{B}{\mathrm{i}}_2\mathrm{S}{\mathrm{r}}_2\mathrm{CaC}{\mathrm{u}}_2{\mathrm{O}}_{8+\delta }$ and $\mathrm{YB}{\mathrm{a}}_2\mathrm{C}{\mathrm{u}}_3{\mathrm{O}}_{6+\mathrm{x}}$ extracted from scanning tunneling spectra
• Unusual electronic structure in underdoped cuprate superconductors
• Experiments using high-Tc/low-Tc Josephson contacts
• Controlling the self-doping of YBa2C3O7-d polar surfaces: From Fermi surface to nodal Fermi arcs by ARPES
• Coexistence of superconductivity and incoherence in quasi 1D chains
• Universal scaling and pairing symmetry for high-temperature cuprate superconductors
• Impurity-Scattering Assisted Umklapp Scattering as the Origin of Low-Temperature Resistivity in the Normal-State of Cuprate Superconductors
• Microwave conductivity due to impurity scattering in cuprate superconductors
• Tunable striped-patterns by lattice anisotropy and magnetic impurities in d-wave superconductors