Coexistence of metallicity and superconductivity in adjacent bilayers of a high-Tc superconductor

Abstract

Experimental studies of the electronic structure remain the basic means for understanding the nature of high-temperature superconductivity (HTSC) and testing relevant theoretical models. Appreciable contributions to establish the overall picture in HTSC have recently been made by investigations on the charge dynamics in BSCCO (ref. 1) and the spin dynamics in YBCO, using Angle Resolved Photoemission Spectroscopy (ARPES) and Inelastic Neutron Scattering (INS), respectively. Concentration of each of these techniques on a "suitable" compound turns out to be a barrier on the way to a crucial quantitative test allowing to support or discard spin fluctuations (interaction between the charge and spin degrees of freedom) as a possible origin for the pairing in doped cuprates. Here we solve the long-standing puzzle of ARPES on YBCO by showing that the photoelectron spectrum of YBCO generally includes two components: One from the topmost anomalously overdoped metallic CuO2 bilayer and the other from the next superconducting bilayer that retains the bulk properties. Our findings clearly show the opening of a large superconducting gap and, for the first time, demonstrate the anisotropic renormalization in the bulk component of YBCO, supporting the universality of these effects for different cuprate families. With our study we re-open this cuprate family for new systematic ARPES investigations.

4 pages, 3 figures

References in corpus (5)

• Manifestation of the magnetic resonance mode in the nodal quasiparticle lifetime in superconducting cuprates
• Evidence for CuO conducting band splitting in the nodal direction of Bi-2212
• Disentangling surface and bulk photoemission using circularly polarized light
• Relation between the one-particle spectral function and dynamic spin susceptibility in superconducting Bi${}_2$Sr${}_2$CaCu${}_2$O${}_{8-\delta }$
• Dynamic spin-response function of the high-temperature Bi${}_2$Sr${}_2$CaCu${}_2$O${}_{8+\delta }$ superconductor form angle resolved photoemission spectra

Cited by in corpus (23)

• Electronic structure of quantum materials studied by angle-resolved photoemission spectroscopy
• Strength of the Spin-Fluctuation-Mediated Pairing Interaction in a High-Temperature Superconductor
• Spin dynamics in the pseudogap state of a high-temperature superconductor
• Crossover from weak to strong pairing in unconventional superconductors
• Magnetic-field-enhanced incommensurate magnetic order in the underdoped high-temperature superconductor YBa(2)Cu(3)O(6.45)
• Time of life as it is in LiFeAs
• ARPES experiment in fermiology of quasi-2D metals (Review Article)
• Absence of a Proximity Effect in a Topological Insulator on a Cuprate Superconductor: Bi2Se3/Bi2Sr2CaCu2O8
• A high resolution, hard X-ray photoemission investigation of BaFe${}_2$As${}_2$: moderate influence of the surface and evidence for a low degree of Fe 3d - As 4p hybridization of the near-E${}_F$ electronic states
• An ARPES view on the high-Tc problem: phonons vs spin-fluctuations
• Buried double CuO chains in YBa${}_2$Cu${}_4$O${}_8$ uncovered by nano-ARPES
• Differentiated roles of Lifshitz transition on thermodynamics and superconductivity in La2-xSrxCuO4
• Superconducting electronic state in optimally doped YBa2Cu3O7-d observed with laser-excited angle-resolved photoemission spectroscopy
• Polarity-dependent charge-density wave in a kagome superconductor CsV3Sb5
• Role of CuO chains in vortex core structure in YBa2Cu3O{7-delta}
• Fermi-surface pockets in $YB{a}_{2}C{u}_3{O}_{6.5}$ : A comparison of ab initio techniques
• Homogeneous superconducting gap in DBCO synthesized by oxide molecular beam epitaxy
• Enhanced superconducting gap in the outer CuO${}_2$ plane of the trilayer cuprate (Hg,Re)Ba${}_2$Ca${}_2$Cu${}_3$O${}_{8+\delta }$
• Interlayer couplings in cuprates: structural origins, analytical forms, and structural estimators
• Enhanced Surface Superconductivity in Ba(Fe${}_{0.95}$Co${}_{0.05}$)${}_2$As${}_2$
• Angle-Resolved Photoelectron Spectroscopy Studies of the Many-Body Effects in the Electronic Structure of High-Tc Cuprates
• Oxide MBE-ARPES at SSRL Beamline 5-2
• Alternate cleavage structure and electronic inhomogeneity in Ca-doped YBa${}_2$Cu${}_3$O${}_{7-\delta }$