作者: L. Degiorgi , E. Kaldis , P. Wachter
DOI: 10.1016/S0921-4534(88)80023-6
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摘要: We have measured the optical reflectivity of La 1.85 Sr .15 CuO 4 , 2 and related materials such as NaCuO . Comparing obtained spectra we point out mixed valence nature these new high T c superconductors.