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The dynamical fluorescent microthermal imaging (FMI) experiment has been used to investigate the phonon-magnon interaction in the 1D Heisenberg antiferromagnet La5Ca9Cu24O41. This material shows highly anisotropic heat conductivity due to the efficient magnetic heat transport along the spin ladders in the compound. To extract information on the phonon-magnon interaction we modelled the dynamic heat transport experiment using a two temperature model approach, taking both the crystal as well as the PMMA/EuTTA fluorescent heat imaging layer into account. The simulations are carried out by the finite element method using COMSOL Multiphysics Heat Transfer Module. The results of the numerical calculations are expected to be used for the data analysis of the experimental studies.
Intriguing lattice dynamics has been predicted for aperiodic crystals that contain incommensurate substructures. Here we report inelastic neutron scattering measurements of phonon and magnon dispersions in Sr14Cu24O41, which contains incommensurate o
We report the direct observation by inelastic neutron scattering experiments of a spin triplet of magnetic excitations in the response associated with the ladders in the composite cuprate Sr14Cu24O41. This appears as a peak at q_{Q1D}=pi and energy D
A way to increase the Scanning Thermal Microscope (SThM) sensitivity in the harmonic 3w mode is to heat the probe with an AC current sufficiently high to generate a coupling between the AC and the DC signals. We detail in this paper how to properly t
We present experiments on the magnetic field-dependent thermal transport in the spin-1/2 ladder system (C$_5$H$_{12}$N)$_2$CuBr$_4$. The thermal conductivity $kappa(B)$ is only weakly affected by the field-induced transitions between the gapless Lutt
High temperature thermal transport in insulators has been conjectured to be subject to a Planckian bound on the transport lifetime $tau gtrsim tau_text{Pl} equiv hbar/(k_B T)$, despite phonon dynamics being entirely classical at these temperatures. W