Electronic pseudogap of optimally doped high-temperature Nd2−xCexCuO4 superconductors

Sunko, Denis K. and Barišić, Slaven (2007) Electronic pseudogap of optimally doped high-temperature Nd2−xCexCuO4 superconductors. Physical Review B, 75 (6). pp. 60506-4. ISSN 1098-0121

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Abstract

We study the effect of antiferromagnetic correlations in the three-band Emery model, in comparison with the experimental angle-resolved photoemission spectra (ARPES) in optimally doped Nd2−xCexCuO4 (NCCO). The same calculation, formerly used to describe Bi2Sr2CaCu2O8+δ (BSCCO), is applied here, but in contrast to BSCCO, where quantum paramagnon fluctuations are important, the characteristic energy of the dispersive paramagnons in NCCO is of the order of Tc. The wide dispersing features of the single-electron spectrum in NCCO are analogous to the BSCCO hump. The Fermi surface is pseudogapped in both the nodal and antinodal directions, although the detailed features differ, being dominated by loss of intensity in the nodal direction, and loss of coherence in the antinodal one. Direct oxygen-oxygen hopping is important in NCCO as well as in BSCCO, in order to obtain overall agreement with the measured ARPES spectra.

Item Type: Article
Keywords: ARPES, pseudogap, high-Tc, superconductivity
Date: February 2007
Subjects: NATURAL SCIENCES > Physics
Additional Information: Copyright (2007) by the American Physical Society.
Divisions: Faculty of Science > Department of Physics
Project code: 0119256
Publisher: American Physical Society
Depositing User: Gordana Stubičan Ladešić
Date Deposited: 27 May 2014 16:34
Last Modified: 27 May 2014 16:34
URI: http://digre.pmf.unizg.hr/id/eprint/1811

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