Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2009-03-17
Phys. Rev. B 80, 052504 (2009).
Physics
Condensed Matter
Strongly Correlated Electrons
5 pages, 3 figures
Scientific paper
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.
Eisaki Hiroshi
Fujimori Atsushi
Hussain Zahid
Shen Zhi-Xun
Uchida Satoko
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