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Regensburg 2004 – scientific programme

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TT: Tiefe Temperaturen

TT 8: Postersitzung I: Supraleitung

TT 8.42: Poster

Monday, March 8, 2004, 14:30–19:00, Poster A

Raman study of charge ordering instabilities in La2−xSrxCuO4 — •Leonardo Tassini1, Francesca Venturini1, Rudi Hackl1, Qing-ming Zhang2, N. Kikugawa3, and Tojitsu Fujita31Walther-Meissner-Institut, Bayerische Akademie der Wissenschaften, D-85748 Garching — 2Department of Physics, Nanjing University, Nanjing 210093, P.R. China — 3ADSM, Hiroshima University, Higashi-Hiroshima 739-8526, Japan

The electronic Raman effect has been studied in differently doped single crystals of La2−xSrxCuO4 (LSCO). At low energies and temperatures new structures indicating a very high conductivity are found for which there is no evidence in Bi2212 and Y123. In the same temperature range a related low-energy mode is found in the optical conductivity. For the selection rules and for similarities with ladder compounds we conclude that the features are an indication of incipient charge ordering and 1D conduction. The correlation length of these stripes is at least of the order of the electronic mean free path in LSCO. The direction of the 1D structures is along the diagonals and the principle axes for x=0.02 and x=0.10, respectively.

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