Buried double CuO chains in YBa${}_2$Cu${}_4$O${}_8$ uncovered by nano-ARPES

Abstract

The electron dynamics in the CuO chains has been elusive in Y-Ba-Cu-O cuprate systems by means of standard angle-resolved photoemission spectroscopy (ARPES); cleaved sample exhibits areas terminated by both CuO-chain or BaO layers, and the size of a typical beam results in ARPES signals that are superposed from both terminations. Here, we employ spatially-resolved ARPES with submicrometric beam (nano-ARPES) to reveal the surface-termination-dependent electronic structures of the double CuO chains in YBa${}_2$Cu${}_4$O${}_8$. We present the first observation of sharp metallic dispersions and Fermi surfaces of the double CuO chains buried underneath the CuO${}_2$-plane block on the BaO terminated surface. While the observed Fermi surfaces of the CuO chains are highly one-dimensional, the electrons in the CuO-chains do not undergo significant electron correlations and no signature of a Tomonaga-Luttinger liquid nor a marginal Fermi liquid is found. Our works represent an important experimental step toward understanding of the charge dynamics and provides a starting basis for modelling the high-$T_c$ superconductivity in YBCO cuprate systems.

10 pages, 5 figures including supplementary material (4 pages, 2 figures)

References in corpus (6)

• Quantum Oscillations in the Underdoped Cuprate YBa2Cu4O8
• Coexistence of metallicity and superconductivity in adjacent bilayers of a high-Tc superconductor
• Breakup of the Fermi surface near the Mott transition in low-dimensional systems
• Self-doping processes between planes and chains in the metal-to-superconductor transition of YBa2Cu3O6.9
• Superconducting electronic state in optimally doped YBa2Cu3O7-d observed with laser-excited angle-resolved photoemission spectroscopy
• Dual character of the electronic structure in YBa2Cu4O8: conduction bands of CuO2 planes and CuO chains

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• A sample-position-autocorrection system with precision better than 1 \um~in angle-resolved photoemission experiments
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