Magneto –THz spectroscopy in spinel superconductor LiTi<sub>2</sub>O<sub>4 </sub>thin films

ORAL

Abstract

We investigate a spinel superconductor, LiTi2O4 using continues wave(CW) terahertz spectroscopy under magnetic fields. By measuring both the magnitude and phase of the transmission, the inversion to complicated conductivity can be done directly and without Kramers-Kronig transformation. LiTi2O4 (LTO)is an oxide superconductor with a spinel crystal structure. Although the phase transition temperature is 10K, it was estimated that the spin fluctuations played an important role in the microscopic mechanism for superconductivity. We observed a clear superconducting gap opening at about 1.9meV and a coherent peak. The superconducting state was strongly suppressed by magnetic field up to 9T. It was the first time that the superconducting gap was observed in the compounds LiTi2O4 with CW terahertz spectroscopy.

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Presenters

  • Yue Huang

    • School of Engineering, Brown University

Authors

  • Yue Huang

    • School of Engineering, Brown University

  • Wei Zhang

    • School of Engineering, Brown University

  • Wei Hu

    • Institute of Physics,Chinese Academy of Sciences
    • National Lab for Superconductivity, Institute of Physics, Chinese Academy of Sciences (CAS)
    • Computational Research Division, Lawrence Berkeley National Laboratory

  • Jie Yuan

    • Institute of Physics,Chinese Academy of Sciences
    • National Laboratory for Condensed Matter Physics, , Institute of Physics Chinese Academy of Sciences
    • National Lab for Superconductivity, Institute of Physics, Chinese Academy of Sciences (CAS)

  • Kui Jin

    • Institute of Physics,Chinese Academy of Sciences
    • Institute of Physics, Chinese Academy of Sciences
    • National Laboratory for Condensed Matter Physics, , Institute of Physics Chinese Academy of Sciences
    • National Lab for Superconductivity, Institute of Physics, Chinese Academy of Sciences (CAS)

  • Daniel Mittleman

    • School of Engineering, Brown University