Abstract
Dynamic control of heat flow for applications in thermal management has attracted much interest in fields such as electronics and thermal engineering. Spin-chain ladder cuprates are promising materials to realize dynamic control of heat flow, since their magnon thermal conductivity is sensitive to the hole density in the spin ladders, which can be dynamically controlled by an external field. Here, we demonstrate the electric control of heat flow using a polycrystalline cuprate film and an ionic liquid. The results showed that a voltage application to the interface causes imperfectly recoverable decreases in both the thermal conductance of the film and the peak due to magnons in the Raman spectra. This result may be attributed to an increase in the hole density in the spin ladders. This report highlights that magnon thermal conduction has potential for the development of advanced thermal management applications.
Highlights
Dynamic control of heat flow for applications in thermal management has attracted much interest in fields such as electronics and thermal engineering
The results showed that a voltage application causes imperfectly recoverable decreases in the thermal conductance of the film and the peak due to magnons in the Raman spectra, which were evaluated by in situ frequency-domain thermoreflectance (FDTR) and Raman spectroscopy under voltage application, respectively
We clearly see the three peaks at ~ 580, ~ 1,100, and ~ 2,900 cm−1, corresponding to those of the heat-treated LCCO film (Fig. 1c), which means that the ionic liquid (IL)/LCCO spectrum includes information on the LCCO film. we examined changes in the IL/LCCO spectrum (Fig. 2c) by voltage application (Fig. 2d)
Summary
Dynamic control of heat flow for applications in thermal management has attracted much interest in fields such as electronics and thermal engineering. S r14Cu24O41 and L a5Ca9Cu24O41 have the same spin ladder structure (Fig. 1a), but their magnon thermal conductivity at room temperature, with values of ~ 10 and ~ 90 W/(m K)[7], respectively, differ by nearly an order of magnitude This difference is attributable to the difference in the hole density in the spin ladders; that is, while La5Ca9Cu24O41 has no holes in the spin ladders, Sr14Cu24O41 has self-doped holes (approximately one hole in the spin ladder per formula unit), leading to a decrease in the mean free path of magnons by magnon-hole scattering and resulting in a drastic decrease in the thermal conductivity[7,11]. We prepared multi-layered samples that include an interface between an ionic liquid (IL) widely used for iontronics, N,N-diethyl-N-methyl-N-(2-methoxyethyl)ammonium bis(trifluoromethanesulfonic)imido
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