Terahertz spectroscopy on breathing pyrochlore LiGaCr<sub>4</sub>S<sub>8</sub>

ORAL

Abstract

A breathing pyrochlore lattice has alternating tetrahedra of different sizes, in which there exist different interactions. The competition of these interactions could lead to some interesting phenomena, for example, magnetic frustration and magnetoelastic coupling [1].
The breathing pyrochlore material LiGaCr4S8 has been measured to have a negative thermal expansion from 10 K to 110 K [1]. We performed THz transmission spectroscopy measurements in this temperature range on a polycrystal sample. An absorption at around 0.3 THz was found, which is possibly an excitation of the Cr3+ ion. We also observed a strong absorption above 0.6 THz likely due to lattice vibrations.

[1] Physical Review B 97, 134117 (2018), G. Pokharel, A. F. May, D. S. Parker, S. Calder, G. Ehlers, A. Huq, S. A. J. Kimber, H. Suriya Arachchige, L. Poudel, M. A. McGuire, D. Mandrus, and A. D. Christianson

*This research is supported by the Center for Emergent Materials, an NSF MRSEC under award number DMR-1420451. GP, DM, ADC are supported by the Gordon and Betty Moore Foundation’s EPIQS Initiative and U.S. DOE, Office of Science, Basic Energy Sciences, Materials Sciences and Engineering Division.

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Presenters

  • YUFEI Li

    • Ohio State Univ - Columbus

Authors

  • YUFEI Li

    • Ohio State Univ - Columbus

  • Evan Jasper

    • Ohio State Univ - Columbus

  • Ganesh Pokharel

    • Physics, University of Tennessee
    • Physics and Astronomy, The University of Tennessee
    • Department of Physics & Astronomy, University of Tennessee, Knoxville
    • University of Tennessee
    • Department of Physics and Astronomy, The University of Tennessee
    • University of Tennessee, Knoxville

  • Andrew D Christianson

    • Materials Science & Technology Division, Oak Ridge National Laboratory
    • Materials Science and Technology Division, Oak Ridge National Laboratory
    • Oak Ridge National Lab
    • Materials Science and Technology Division, Oak Ridge National Lab
    • Materials Science and Technology Division, OakRidge National Laboratory

  • David Mandrus

    • Physics, University of Tennessee
    • Materials Science and Engineering, The University of Tennessee
    • Department of Materials Science & Engineering, University of Tennessee, Knoxville
    • The University of Tennesse, Knoxville
    • University of Tennessee
    • Department of Physics and Astronomy, University of Tennessee
    • Oak Ridge National Laboratory
    • Department of Materials Science and Engineering, University of Tennessee Knoxville
    • Department of Materials Science and Engineering, University of Tennessee
    • University of Tennessee, Knoxville
    • Material Science and Technology Division, Oak Ridge National Laboratory
    • Material Science and Technology Division, Oak Ridge National Lab

  • Rolando Valdes Aguilar

    • Ohio State Univ - Columbus
    • Ohio State Univ
    • Physics, The Ohio State University
    • Ohio State University
    • Department of Physics, The Ohio State University