Continuous wave terahertz spectroscopy of Sr$_{2}$CrReO$_{6}$ thin films at cryogenic temperatures and in high magnetic fields

ORAL

Abstract

Temperature and magnetic field dependent terahertz spectroscopies have proven useful in characterizing and manipulating the structural, charge, and magnet ordering in complex oxide systems. THz transmission measurements on epitaxial thins films of the double-perovskite ferrimagnet Sr$_{2}$CrReO$_{6}$ (SCRO) were performed with a novel continuous-wave terahertz transmission spectrometer operating from 5 K to 300 K and with fields up to 9 T. Temperature-dependent changes in the film conductivity manifest as strong variations in the Fabry-Perot interference patterns from the supporting substrate. Indicative of variable-range hopping transport in the films, we find the conductivity varies with the THz frequency (f) as f$^{s}$ with s$\sim $0.8 at 5 K. Depending on the handedness of the incident THz source, magnetic fields in excess of 4 T enhance or suppress the THz transmission of the SCRO films by $\sim $8{\%}.

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Authors

  • D.R. Daughton

    • Lake Shore Cryotronics

  • R. Higgins

    • Lake Shore Cryotronics

  • S. Yano

    • Lake Shore Cryotronics

  • C.H. Du

    • The Ohio State University

  • A.J. Hauser

    • The Ohio State University

  • R. Adur

    • The Ohio State University

  • J.M. Lucy

    • The Ohio State University

  • H.L. Wang

    • The Ohio State University

  • D.V. Pelekhov

    • The Ohio State University

  • E. Johnston-Halperin

    • The Ohio State University

  • F.Y. Yang

    • The Ohio State University

  • P.C. Hammel

    • The Ohio State University