In:
International Journal of Modern Physics B, World Scientific Pub Co Pte Ltd, Vol. 14, No. 29n31 ( 2000-12-20), p. 3602-3609
Abstract:
We have studied the electronic structure of the stripe phase in La 2-x Sr x CuO 4 (LSCO) and the Cu-O chains in PrBa 2 Cu 3 O 7 (Pr123) and PrBa 2 Cu 4 O 8 (Pr124) using angle-resolved photoemission spectroscopy (ARPES). In LSCO with x=0.12, the spectral feature near the Fermi level (E F ) is almost flat from (π, 0) to (π, π/4), namely, along the stripe direction in LSCO. While the 1/4-filled chain in Pr123 has a band gap because of charge ordering, the metallic chain in Pr124 shows a dispersive feature which reaches E F at ~(π, π/4) and a flat feature near E F which is similar to that observed in the stripe phase of LSCO. Although Pr124 shows spectral-weight suppression near E F due to the instability toward charge ordering, the suppression is imperfect and Pr124 has a substantial spectral weight at E F probably due to the chain-chain coupling. This is in sharp contrast to LSCO with the perfect gap opening near (π, π/4). The difference between the stripe phase in LSCO and the coupled chains of Pr124 would be derived from the interaction between the stripe and the neighboring Cu spins which suppresses the charge ordering along the stripe.
Type of Medium:
Online Resource
ISSN:
0217-9792
,
1793-6578
DOI:
10.1142/S021797920000412X
Language:
English
Publisher:
World Scientific Pub Co Pte Ltd
Publication Date:
2000
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