Underlying Fermi surface of Sr${}_{14-x}$Ca${}_x$Cu${}_{24}$O${}_{41}$ in two-dimensional momentum space observed by angle-resolved photoemission spectroscopy

Abstract

We have performed an angle-resolved photoemission study of the two-leg ladder system Sr${}_{14-x}$Ca${}_x$Cu${}_{24}$O${}_{41}$ with $x$= 0 and 11. "Underlying Fermi surfaces" determined from low energy spectral weight mapping indicates the quasi-one dimensional nature of the electronic structure. Energy gap caused by the charge density wave has been observed for $x$=0 and the gap tends to close with Ca substitution. The absence of a quasi-particle peak even in $x$=11 is in contrast to the two-dimensional high-$T_c$ cuprates, implying strong carrier localization related to the hole crystalization.

5 pages, 3 figures

References in corpus (2)

• Low-Energy Electronic Structure of the High-Tc Cuprates La2-xSrxCuO4 Studied by Angle-resolved Photoemission Spectroscopy
• The electronic structure of the Na${}_x$CoO${}_2$ surface

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• Hole-depletion of ladders in Sr${}_{14}$Cu${}_{24}$O${}_{41}$ induced by correlation effects
• Evidence for an orbital dependent Mott transition in the ladders of (La,Ca)${}_x$Sr${}_{14-x}$Cu${}_{24}$O${}_{41}$ derived by electron energy-loss spectroscopy
• Three-Dimensional Multiband d-p Model of Superconductivity in Spin-Chain Ladder Cuprate