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Infrared Spectra of Single Crystals of Underdoped Bi 2 Sr 2 CaCu 2 O 8+δ
Author(s) -
Tanaka J.,
Tanaka C.,
Takada K.,
Mori W.
Publication year - 1999
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/(sici)1521-3951(199909)215:1<541::aid-pssb541>3.0.co;2-s
Subject(s) - cuprate , superconductivity , spectral line , angle resolved photoemission spectroscopy , condensed matter physics , infrared , doping , cooper pair , infrared spectroscopy , materials science , ab initio , physics , electronic structure , optics , quantum mechanics
Infrared spectra of cuprate superconductors show characteristic features in the superconducting (SC) state depending on the level of doping. The reflection spectra of single crystals of Bi 2 Sr 2 CaCu 2 O 8+δ (Bi2212), show a little change of spectra even below T c which is rather unusual for a superconductor. Infrared spectra of underdoped Bi2212 crystals (10% and 15% Dy doped crystals) are investigated and the superconducting gap is found below T c by condensation of free carriers to Cooper pair. Origin of such a dramatic change is discussed based on the energy contour found by angle resolved photoelectron spectra (ARPES) of underdoped Bi2212 and its analysis by an ab‐initio quantum chemical calculation of model clusters of cuprates.