Photoemission studies on electron doped cuprate Pr0.85LaCe0.15CuO4: Revisiting the chemical pressure effect

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We performed angle resolved photoemission spectroscopy (ARPES) experiments on electron doped cuprates Pr0.85LaCe0.15CuO4 (PLCCO) and Nd1.85Ce0.15CuO4 (NCCO). Critical temperatures (T-c) of PLCCO and NCCO are similar but PLCCO has weaker Fermi surface curvature than NCCO. As the ionic radius of Pr and La is larger than that of Nd, this result is inconsistent with the earlier view that chemical pressure determines the Fermi surface curvature. On the other hand, anti-ferromagnetic (AFM) band renormalization effect in PLCCO is larger than that in NCCO, which implies AFM is stronger in PLCCO. This is consistent not only with the view that AFM is correlated with t'/t but also with recent inelastic neutron scattering results. Therefore, we suggest that the chemical pressure effect is not the only factor that determines the Fermi surface topology. (C) 2010 Elsevier Ltd. All rights reserved
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Issue Date
2011-05
Language
English
Article Type
Article; Proceedings Paper
Keywords

TEMPERATURE SUPERCONDUCTOR; STATE; GAP

Citation

JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS, v.72, no.5, pp.533 - 535

ISSN
0022-3697
DOI
10.1016/j.jpcs.2010.10.069
URI
http://hdl.handle.net/10203/212610
Appears in Collection
NT-Journal Papers(저널논문)
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