Analysis of the temperature dependence of the thermal conductivity of insulating single crystal oxides

Langenberg, Eric; Ferreiro‐Vila, Elías; Leborán, Víctor; Fumega, Adolfo O.; Pardo, Víctor; Rivadulla, F.

doi:10.1063/1.4966220

Cited by 59 publications

(45 citation statements)

References 49 publications

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“…As we have already mentioned, this method allows to stabilize the high temperature phase, permitting us to compute the thermal conductivity in the cubic phase. Its calculated value is 13.4 W/mK which is in reasonable agreement with the one reported by experiments (11 (W/mK) at 300 K) [35]. The small overestimation in our calculation may perhaps be due to the lack of impurities and boundary scattering in our calculations as opposed to the experimental case.…”

Section: Resultssupporting

confidence: 90%

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Understanding the lattice thermal conductivity of SrTiO3 from an ab initio perspective

Fumega

Pardo

et al. 2020

Phys. Rev. Materials

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We present a detailed analysis of the structure dependence of the lattice thermal conductivity of SrTiO3. We have used both ab initio Molecular Dynamic simulations and Density Functional Theory calculations to decouple the effect of different structural distortions on the thermal conductivity. We have identified two main mechanisms for tuning the thermal conductivity when a distortion is applied. First, the modification of the acoustic-modes energy dispersion when a change in the lattice parameters is imposed and second, the low energy polar modes. In particular and counterintuitively, we have found that an increase in the angle of the oxygen octahedral rotations increases the thermal conductivity due to its coupling to these polar modes.

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Section: Resultssupporting

confidence: 90%

“…κ xx = κ yy = 14.2 W/mK. Considering that V 0 is overestimated by GGA, these are in pretty good agreement with the experimental value [35] and also with previous calculations [14]. We see that a decrease of a 1% in the unit cell volume produces an increase of around a 30% on the thermal conductivity.…”

Section: Resultssupporting

confidence: 90%

Understanding the lattice thermal conductivity of SrTiO3 from an ab initio perspective

Fumega

Pardo

et al. 2020

Phys. Rev. Materials

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“…From this experimental curve, we interpolate the values of κ FM at the t FM of the samples studied in the LSSE experiments. Concerning MgO substrate, we measured κ S = 44.2(5) Wm −1 K −1 at T = 300 K, in agreement with reported values for MgO single crystals 32,33 .…”

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confidence: 90%

Quantification of the interfacial and bulk contributions to the longitudinal spin Seebeck effect

Jiménez-Cavero

Lucas

Bugallo

et al. 2021

Applied Physics Letters

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We report the disentanglement of bulk and interfacial contributions to the thermally excited magnon spin current in the spin Seebeck effect under static heating. For this purpose, we have studied the dependence of the inverse Spin Hall voltage and the thermal conductivity on the magnetic layer thickness. Knowledge of these quantities allows us to take into account the influence of both sources of thermal spin current in the analysis of the voltage dependence. The magnetic layer thickness modulates the relative magnitude of the involved thermal drops for a fixed total thermal difference throughout the sample. In the end, we attain the separate contributions of both sources of thermal spin current -bulk and interfacial-and obtain the value of the thermal magnon accumulation length scale in maghemite, which we find to be 29(1) nm. According to our results, bulk magnon accumulation dominates the spin Seebeck effect in our studied range of thicknesses, but the interfacial component is by no means negligible.

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“…However, for the complex oxides, a ∼ 1/T behavior must have a different origin, since in the relevant temperature range, typically 250K T 700K, the phonon mean free path is very small, of order or even smaller than the lattice constant. Therefore, it was often suggested that umklapp scattering alone is unlikely to be sufficiently strong to account for the observed small mean-free path (12,27,28). Furthermore, due to their structural complexity, complex oxides are susceptible to a variety of local disorder effects, which may further enhance relaxation processes and thus degrade thermal transport.…”

Section: Observations and Analysesmentioning

confidence: 99%

Thermalization and possible signatures of quantum chaos in complex crystalline materials

Zhang

Kountz

Behnia

et al. 2019

Proc. Natl. Acad. Sci. U.S.A.

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Analyses of thermal diffusivity data on complex insulators and on strongly correlated electron systems hosted in similar complex crystal structures suggest that quantum chaos is a good description for thermalization processes in these systems, particularly in the high temperature regime where the many phonon bands and their interactions dominate the thermal transport. Here we observe that for these systems diffusive thermal transport is controlled by a universal Planckian time scale τ ∼ /k B T , and a unique velocity v E . Specifically, v E ≈ v ph for complex insulators, and v ph v E v F in the presence of strongly correlated itinerant electrons (v ph and v F are the phonons and electrons velocities respectively). For the complex correlated electron systems we further show that charge diffusivity, while also reaching the Planckian relaxation bound, is largely dominated by the Fermi velocity of the electrons, hence suggesting that it is only the thermal (energy) diffusivity that describes chaos diffusivity.Quantum Chaos | Thermalization | Thermal diffusivity | Phonons

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Analysis of the temperature dependence of the thermal conductivity of insulating single crystal oxides

Cited by 59 publications

References 49 publications

Understanding the lattice thermal conductivity of SrTiO3 from an ab initio perspective

Understanding the lattice thermal conductivity of SrTiO3 from an ab initio perspective

Quantification of the interfacial and bulk contributions to the longitudinal spin Seebeck effect

Thermalization and possible signatures of quantum chaos in complex crystalline materials

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