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27 April 2024

» pubmed » pmid11082650

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Angle-resolved photoemission study of insulating and metallic Cu-O chains in PrBa2Cu3O7 and PrBa2Cu4O8
T Mizokawa ; C Kim ; Z X Shen ; A Ino ; T Yoshida ; A Fujimori ; M Goto ; H Eisaki ; S Uchida ; M Tagami ; K Yoshida ; A I Rykov ; Y Siohara ; K Tomimoto ; S Tajima ; Y Yamada ; S Horii ; N Yamada ; Y Yamada ; I Hirabayashi ;
Date:	27 Nov 2000
Journal:	Phys Rev Lett, 85 (22), 4779-82
Abstract:	We compare the angle-resolved photoemission spectra of the hole-doped Cu-O chains in PrBa2Cu3O7 (Pr123) and in PrBa2Cu4O8 (Pr124). While, in Pr123, a dispersive feature from the chain takes a band maximum at k(b) (momentum along the chain) approximately pi/4 and loses its spectral weight around the Fermi level, it reaches the Fermi level at k(b) approximately pi/4 in Pr124. Although the chains in Pr123 and Pr124 are approximately 1/4 filled, they show contrasting behaviors: While the chains in Pr123 have an instability to charge ordering, those in Pr124 avoid it and show an interesting spectral feature of a metallic coupled-chain system.
Source:	PubMed, pmid11082650
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