Hamburg 2001 – scientific programme

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TT: Tiefe Temperaturen

TT 6: Postersitzung I: Josephsonkontakte und SQUIDs, Supraleitung: Theorie, Korrelierte Elektronen, Niederdimensionale Systeme, Magnetotransport, Quantenhalleffekt, Kohlenstoff-Nanoröhrchen, Quantenflüssigkeiten

TT 6.39: Poster

Monday, March 26, 2001, 14:30–17:00, Rang S\ 3

STRUCTURE AND ELECTRONIC PROPERTIES OF Sr₁₄Cu₂₄O₄₁: OPTICAL STUDY — •B. Gorshunov¹, P. Haas¹, M. Dressel¹, V. Torgashev², V. Shirokov², and J. Akimitsu³ — ¹I.Physikalisches Institut, Universität Stuttgart, Germany — ²Rostov State University, Rostov-on-Don, Russia — ³Aoyama-Gakuin University, Japan

Spectra of optical conductivity and dielectric constant of the ladder compound Sr₁₄Cu₂₄O₄₁ are obtained by a combination of various spectroscopic techniques in the range of frequencies 5-10000 cm-1 at temperatures 5-300 K. A number of new absorption lines along all three crystallographic axes is discovered whose origin is analyzed using the Landau theory of structural phase transitions. Mechanisms of conductivity and origin of the pseudogap are discussed.