Regensburg 2002 – scientific programme

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TT: Tiefe Temperaturen

TT 11: Supraleitung: Elektronenstruktur, Phononen, Tunneln, Ordnungsparameter II

TT 11.4: Talk

Tuesday, March 12, 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 La_1.4−xNd_0.6Sr_xCuO₄ (LSCO) or superconductivity in La_2−xSr_xCuO₄ (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.