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Regensburg 2004 – scientific programme

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TT: Tiefe Temperaturen

TT 30: Postersitzung IV: Kritische Ph
änomene, Quantenstörstellen, niederdimensionale Systeme

TT 30.42: Poster

Thursday, March 11, 2004, 14:30–19:00, Poster A

In-plane infrared conductivity of untwinned La2−xSrxCuO4 crystals in the regime of stripe order. — •Michael Dumm1,2, Dimitri Basov2, Seiki Komiya3, and Yoichi Ando311. Physikalisches Institut, Universität Stuttgart, 70550 Stuttgart — 2Department of Physics, University of California at San Diego, La Jolla, CA, USA — 3Central Research Institute of Electric Power Industry, Tokyo, Japan

Using infrared spectroscopy, we show that spin self-organization in untwinned La1.97Sr0.03CuO4 and La1.96Sr0.04CuO4 single crystals has profound consequences for the dynamical conductivity σ(ω). The electronic response of CuO2 planes acquires significant anisotropy in the spin-ordered state with enhancement of the conductivity along the direction of the diagonal spin stripes by up to a factor of two. An examination of the anisotropic response indicates that the diagonal spin texture in weakly doped La2−xSrxCuO4 is also accompanied by the modulation of charge density. The electronic response of the charge stripes is found to be gapless consistent with the hypothesis of the metallic ground state. Our experiments directly show that the striped ordered systems reveal new degrees of freedom not present in ordinary one-dimensional conductors.

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