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Underlying Fermi surface of Sr_(14-x)Ca_xCu₂₄O₄₁ in two-dimensional momentum space observed by angle-resolved photoemission spectroscopy

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arxiv 0903.2918 v1 pith:WE7D6MDO submitted 2009-03-17 cond-mat.str-el cond-mat.supr-con

Underlying Fermi surface of Sr_(14-x)Ca_xCu₂₄O₄₁ in two-dimensional momentum space observed by angle-resolved photoemission spectroscopy

T. Yoshida , X. J. Zhou , Z. Hussain , Z.-X. Shen , A. Fujimori , H. Eisaki , S. Uchida This is my paper
classification cond-mat.str-el cond-mat.supr-con
keywords angle-resolvedenergyfermiobservedphotoemissiontwo-dimensionalunderlyingabsence
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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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.

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