Buried double CuO chains in YBa2Cu4O8 uncovered by nano-ARPES

DOI: 10.1103/PhysRevB.99.140510

Authors: Hideaki Iwasawa (Diamond Light Source; Hiroshima University) , Pavel Dudin (Diamond Light Source) , Kyosuke Inui (Kindai University) , Takahiko Masui (Kindai University) , Timur K. Kim (Diamond Light Source) , Cephise Cacho (Diamond Light Source) , Moritz Hoesch (Diamond Light Source; Deutsches Elektronen-Synchrotron (DESY))
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Physical Review B , VOL 99

State: Published (Approved)
Published: April 2019
Diamond Proposal Number(s): 21083

Abstract: Identifying the electron dynamics in CuO chains has been elusive in Y-Ba-Cu-O (YBCO) cuprate systems when using standard angle-resolved photoemission spectroscopy (ARPES); a cleaved sample exhibits areas terminated by both CuO chains 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 a 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 an observation of sharp metallic dispersions and Fermi surfaces of the double CuO chains buried underneath the CuO 2 -plane block on a 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 or a marginal Fermi liquid is found. Our work represents an important experimental step toward understanding the charge dynamics and provides a starting basis for modeling the high- T c superconductivity in YBCO cuprate systems.

Subject Areas: Physics, Materials


Instruments: I05-ARPES

Added On: 21/05/2019 09:31

Discipline Tags:

Superconductors Quantum Materials Physics Hard condensed matter - structures Materials Science

Technical Tags:

Spectroscopy Angle Resolved Photoemission Spectroscopy (ARPES) Nano ARPES