Thermal Conductivity and Magnetic Phase Diagram of CuB2O4

Abstract

We have measured temperature and magnetic field dependences of the thermal conductivity along the c-axis, kc, and that along the [110] direction, k110, of CuB2O4 single crystals in zero field and magnetic fields along the c-axis and along the [110] direction. It has been found that the thermal conductivity is nearly isotropic and very large in zero field and that the thermal conductivity due to phonons is dominant in CuB2O4. The temperature and field dependences of kc and k110 have markedly changed at phase boundaries in the magnetic phase diagram, which has been understood to be due to the change of the mean free path of phonons caused by the change of the phonon-spin scattering rate at the phase boundaries. It has been concluded that thermal conductivity measurements are very effective for detecting magnetic phase boundaries.

arXiv comment18 pages, 6 figures

References in corpus (14)

• Magnon Heat Transport in (Sr,La)_14Cu_24O_41
• Heat transport by lattice and spin excitations in the spin chain compounds SrCuO_2 and Sr_2CuO_3
• Ballistic heat transport of quantum spin excitations as seen in SrCuO2
• Thermal conductivity and specific heat of the linear chain cuprate Sr${}_2$CuO${}_3$: Evidence for thermal transport via spinons
• Formation of a magnetic soliton lattice in copper metaborate
• Thermal Conductivity of the Spin Peierls Compound CuGeO_3
• Strong damping of phononic heat current by magnetic excitations in SrCu_2(BO_3)_2
• Evidence for Ballistic Thermal Conduction in the One-Dimensional S=1/2 Heisenberg Antiferromagnetic Spin System Sr2CuO3
• Spin-wave spectrum of copper metaborate in the commensurate phase 10K<T<21K
• Drastic enhancement of magnon thermal conductivity in the Bose-Einstein condensed state of TlCuCl${}_3$
• Enhancement of Thermal Conductivity due to Spinons in the One-Dimensional Spin System SrCuO_2
• Spin dynamics in copper metaborate $Cu{B}_2{O}_4$ studied by muon spin relaxation
• Multi-Triplet Magnons in SrCu${}_2$(BO${}_3$)${}_2$ Studied by Thermal Conductivity Measurements in Magnetic Fields
• Thermal Conductivity and Spin State of the Spin Diamond-Chain System Azurite Cu3(CO3)2(OH)2

Cited by in corpus (1)

• Zeeman and Davydov splitting of Frenkel excitons in the antiferromagnet CuB${}_2$O${}_4$