Anisotropic heat conduction in the metal-organic framework perovskites

ORAL

Abstract

We report thermal conductivity (κ) measurements on single crystals of the metal-organic framework perovskite compounds [C(NH2)3]X(HCOO)3 (X=Cu, Zn) in the temperature range 5K ≤ T ≤ 300K. The directionality of N-H---O bonds and their stretching due to the Jahn-Teller distortion in the Cu compound are identified as mechanisms underlying differences in κ(T) behavior for the two compounds and its anisotropy. For heat flow along a direction preferentially transverse to the N-H---O bonds, κ≈ 0.6 W/mK near 300 K, approaching the theoretical minimum value. A possible magnetic contribution to the heat flow in the Cu compound will also be discussed.

*This material is based upon work supported by the U.S. Department of Energy, Office of Basic Energy Sciences, Division of Material Sciences and Engineering, under grant No. DE-SC0008607, and by the Univ. Miami CAS Convergence grant.

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Presenters

  • Dharmendra Shukla

    • Physics, University of Miami

Authors

  • Dharmendra Shukla

    • Physics, University of Miami

  • Narayan Prasai

    • University of Miami
    • Physics, University of Miami

  • Thomas M. Carlino

    • Chemistry, University of Miami

  • Mercedes M. A. Mazza

    • Chemistry, University of Miami

  • Amy M. Scott

    • Chemistry, University of Miami

  • Joshua Cohn

    • University of Miami
    • Physics, University of Miami