ISSN:
1434-6036
Schlagwort(e):
74.30.Gn
;
74.70.Vy
;
78.30.Er
;
78.65.Ez
Quelle:
Springer Online Journal Archives 1860-2000
Thema:
Physik
Notizen:
Abstract The optical spectrum of reduced-T c GdBa2Cu3O7−δ has been measured for polarizations parallel and perpendicular to theab plane. The sample was an oxygen-deficient single crystal with a large face containing thec axis. The polarized reflectance from this face was measured from 20–300 K in the spectral region from 30–3000 cm−1, with 300 K data to 30000 cm−1. Kramers-Kronig analysis was used to determine the spectral dependence of theab and thec components of the dielectric tensor. The optical properties are strongly anisotropic. Theab-plane response resembles that of other reduced-T c materials whereas thec axis, in contrast, shows only the presence of several phonons. There is a complete absence of charge carrier response alongc aboveand belowT c. This observation allows us to set an upper limit to the free-carrier spectral weight for transport perpendicular to the CuO2 planes.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1007/BF01313052
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