Thermal Conductivity due to Magnon Heat Transport in Ca$_{2+x}$Y$_{2-x}$Cu$_{5}$O$_{10}$

ORAL

Abstract

In the spin-chain structure Ca$_{2+x}$Y$_{2-x}$Cu$_{5}$O$_{10}$, the thermal conductivity in some samples is observed to exhibit two peaks attributed to the thermal transport contributions by phonons and magnons. We have built a thermal conductivity probe, with a 2D rotation stage, to study the magnon contribution to the thermal conductivity of ceramic samples over the range 4--300 K. We plan to measure changes in the magnon contribution by varying the orientation of the lattice with respect to the magnetic field. We have prepared a set of samples with small deviations in oxygen stoichiometry to examine the effects of the defects on magnon thermal transport.

*NSF DMR-060528, Welch F-1191, HHMI- S2005907, NSF-26-1127-6950

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Authors

  • Raheem Bello

    • Department of Physics, Department of Astronomy University of Texas

  • Isaac V. Manzanera Esteve

    • Department of Physics, University of Texas
    • The University of Texas at Austin, Department of Physics
    • University of Texas. Physics Department

  • John T. Markert

    • Department of Physics, University of Texas
    • The University of Texas at Austin, Department of Physics
    • University of Texas. Physics Department
    • Department of Physics, The University of Texas at Austin