Journal article
Excitonic absorption and superconductivity in YBa2Cu3O7-y
Abstract
Optical and neutron-diffraction studies of superconducting and nonsuperconducting samples of YBa2Cu3O7-y are described. Superconducting samples, with y≊0.1, showed two strong electronic transitions, at 3000 cm-1/0.37 eV and at 20 000 cm-1/2.5 eV, which are interpreted as charge-transfer bands (i.e., excitons). Nonsuperconducting samples, with y≊0.8 (prepared by heating of superconducting samples in vacuum to deplete the oxygen content), did not …
Authors
Kamarás K; Porter CD; Doss MG; Herr SL; Tanner ADB; Bonn DA; Greedan JE; O’Reilly AH; Stager CV; Timusk T
Journal
Physical Review Letters, Vol. 59, No. 8, pp. 919–922
Publisher
American Physical Society (APS)
Publication Date
August 24, 1987
DOI
10.1103/physrevlett.59.919
ISSN
0031-9007