Regensburg 2002 – wissenschaftliches Programm
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TT: Tiefe Temperaturen
TT 11: Supraleitung: Elektronenstruktur, Phononen, Tunneln, Ordnungsparameter II
TT 11.4: Vortrag
Dienstag, 12. März 2002, 15:45–16:00, H19
Infrared spectroscopy of static and fluctuating stripes in cuprates — •M. Dumm1, D.N. Basov1, S. Komiya2, X.F. Sun2, Y. Abe2, and Y. Ando2 — 1Department of Physics, University of California at San Diego, La Jolla, CA, U.S.A. — 2Central Research Institute of Electric Power Industry, Tokyo, Japan
Using infrared spectroscopy, we found that changes in the in-plane charge dynamics attributable to static stripe order in La1.4−xNd0.6SrxCuO4 (LSCO) or superconductivity in La2−xSrxCuO4 (LNSCO) are confined to energies smaller than 200 cm−1. An absorption peak in the low-frequency conductivity of the LNSCO is suggestive of localization effects due to the reduced dimensionality of static charge stripes. The energy scale attributable to localization appears to be comparable to the magnitude of the superconducting gap in LSCO. Apart from these localization effects the overall electromagnetic response of both static and fluctuating stripes is similar indicating that “static” stripe order in LNSCO deviates from the idealized picture of 1D charge channels insulated by AFM domains. Neither static stripe ordering in LNSCO nor superconductivity in LSCO have influence on the pseudogap behavior observed at much higher temperature and energy scales.