Photo-induced c-axis terahertz response of stripe-ordered cuprate superconductor La<sub>1.6-x</sub>Nd<sub>0.4</sub>Sr<sub>x</sub>CuO<sub>4</sub>

ORAL

Abstract

High-Tc cuprate superconductors are known to exhibit multiple charge- and spin-ordered phases, whose interplay with superconductivity is expected to provide crucial insights on understanding high-Tc superconductivity. Stripe order that is seen in La-based cuprates is the representative case that exhibits strong competition with the superconductivity, where charge and spin are align in a form of stripes in CuO2 plane. To investigate the microscopic interplay between stripe order and superconductivity, we performed optical pump-terahertz probe spectroscopy along c-axis of stripe-ordered cuprate La1.6-xNd0.4SrxCuO4 (x = 0.12) above Tc. We found a sharp plasma edge appearing in the reflectivity spectrum just after photo-excitation, followed by redshift within a few ps. This plasma edge was observed below charge-ordering temperature TCO = 69 K. Below spin-ordering temperature TSO = 55 K, a long-lived reflectivity enhancement was identified. Based on these experimental results, we discuss the interplay between the charge/stripe order and the superconductivity.

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Presenters

  • Morihiko Nishida

    • Department of Physics, The University of Tokyo

Authors

  • Morihiko Nishida

    • Department of Physics, The University of Tokyo

  • Kota Katsumi

    • Johns Hopkins University
    • Cryogenic Research Center and Department of Physics, The University of Tokyo

  • Dongjoon Song

    • National Institute of Advanced Industrial Science and Technology
    • Department of Physics and Astronomy and Quantum Matter Institute, University of British Columbia

  • Hiroshi Eisaki

    • Inst. of Advanced Industrial Science and Tech., Tsukuba, Ibaraki 305-8568, Japan.
    • National Institute of Advanced Industrial Science and Technology
    • Electronics and Photonics Research Institute, National Institute of Advanced Industrial Science and Technology, Tsukuba, Ibaraki, Japan
    • AIST
    • Inst. of Advanced Industrial Science and Tech.
    • AIST, Tsukuba, Japan

  • Ryo Shimano

    • The University of Tokyo
    • Cryogenic Research Center and Department of Physics, The University of Tokyo