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Anisotropic optical properties of single-crystal GdBa2Cu3O7−δ (1995)

Železny, V. ; Tanner, D. B. ; Kamarás, K. ; [et al.]

Springer

The European physical journal 96 (1995), S. 313-318

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ISSN: 1434-6036

Keywords: 74.30.Gn ; 74.70.Vy ; 78.30.Er ; 78.65.Ez

Source: Springer Online Journal Archives 1860-2000

Topics: Physics

Notes: 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.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF01313052

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Luminescent polymers with discrete emitter units (1994)

Musfeldt, J. L. ; Reynolds, John R. ; Tanner, D. B. ; [et al.]

Bognor Regis [u.a.] : Wiley-Blackwell

Journal of Polymer Science Part B: Polymer Physics 32 (1994), S. 2395-2404

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ISSN: 0887-6266

Keywords: polyphenylenes ; luminescence ; broken conjugation ; discrete emitter center ; charge defect ; Chemistry ; Polymer and Materials Science

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology , Physics

Notes: Optical absorption and photo-luminescence measurements were performed on a series of semiconducting polymers, based upon phenylene linkages, that have discrete emitter units. In these polymers, broken conjugation has been achieved in two ways: by introducing metalinkages between various numbers of para-connected aromatic groups or by severe steric distortion of a fully conjugated main chain. In either case, electronic states are localized on relatively small units, resulting in a large (π, π*) band gap. The band gap decreases with increasing emitter unit conjugation, as expected. Blue light emission was observed from these materials, with the peak emission wavelength red shifted (by greater than 1 eV on average) from the peak absorption. © 1994 John Wiley & Sons, Inc.

Additional Material: 5 Ill.