Pseudogap in the chain states of YBCO

Abstract

As established by scanning tunneling microscopy (STM) cleaved surfaces of the high temperature superconductor YBa${}_2$Cu${}_2$O${}_{7-\delta }$ develop charge density wave (CDW) modulations in the one-dimensional (1D) CuO chains. At the same time, no signatures of the CDW have been reported in the spectral function of the chain band previously studied by photoemission. We use soft X-ray angle resolved photoemission (SX-ARPES) to detect a chain-derived surface band that had not been detected in previous work. The $2k_{\text{F}}$ for the new surface band is found to be 0.55\,Å${}^{-1}$, which matches the wave vector of the CDW observed in direct space by STM. This reveals the relevance of the Fermi surface nesting for the formation of CDWs in the CuO chains in YBa${}_2$Cu${}_2$O${}_{7-\delta }$. In agreement with the short range nature of the CDW order the newly detected surface band exhibits a pseudogap, whose energy scale also corresponds to that observed by STM.

References in corpus (14)

• Progress and perspectives on the electron-doped cuprates
• Two energy gaps and Fermi surface 'arcs' in NbSe2
• Pseudogap and charge density waves in two dimensions
• Loss of nodal quasiparticle integrity in underdoped YBa2Cu3O6+x
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• Disentangling surface and bulk photoemission using circularly polarized light
• Excitation energy map of the high-energy dispersion anomalies in cuprates
• Revealing the ortho-II Band Folding in YBa2Cu3O7-delta Films
• Theory of (001) surface and bulk states in Y${}_{1-y}$Ca${}_y$Ba${}_2$Cu${}_3$O${}_{7-\delta }$}
• Electronic structure of Pr_{2-x}Ce_xCuO_4 studied via ARPES and LDA+DMFT+Σ_k
• Theory of the waterfall phenomenon in cuprate superconductors

Cited by in corpus (9)

• Competing charge, spin, and superconducting orders in underdoped YBa2Cu3Oy
• Three-Dimensional Fermi Surface of Overdoped La-Based Cuprates
• Self-doping processes between planes and chains in the metal-to-superconductor transition of YBa2Cu3O6.9
• Fermi surface reconstruction from bilayer charge ordering in the underdoped high temperature superconductor YBa2Cu3O6+x
• Charge-screening role of $c$-axis atomic displacements in YBa${}_2$Cu${}_3$O${}_{6+x}$ and related superconductors
• Electron-like Fermi surface and in-plane anisotropy due to chain states in YBa${}_2$Cu${}_3$O${}_{7-\delta }$ superconductors
• Prediction of $f$-wave pairing symmetry in YBa${}_2$Cu${}_3$O${}_{6+x}$ cuprates
• Homogeneous superconducting gap in DBCO synthesized by oxide molecular beam epitaxy
• Polarization-dependent resonant inelastic X-ray scattering study at the Cu L and O K-edge of YBa${}_2$Cu${}_3$O${}_{7-x}$