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Hysteresis - Wikipedia
First Published Imprint CRC Press. Pages pages. Therefore, the hysteretic behavior of c -axis thermal conductivity in MoTe 2 is dominated by phonons. It means that MoTe 2 could be a more suitable material for the applications of thermal logic devices which are purely based on phonon transportations. It will be a benefit to the consistency of device performance when MoTe 2 is applied in thermal memory devices.
The layered TMDs can be mechanically exfoliated into one monolayer or a few layers, which provides the opportunities for its further applications in the integrated phononic devices. In conclusion, we have measured the c -axis thermal conductivities of MoTe 2 samples synthesized by a CVT method. By means of the theoretical analysis based on BTE, we found the phonon scatterings in the 2H-MoTe 2 were dominated by the Umklapp process, while those in the metastable phase MoTe 2 were dominated by the boundary scatterings due to the high-density phase boundaries and stacking disorders.
The largest difference of thermal conductivity in the hysteresis loop was comparable to that of the traditional PCMs, and the thermal transport along c -axis in MoTe 2 is dominated by phonons. Therefore, the material system studied here may be a promising candidate for all-phononic devices. This work shows an opportunity for the subsequent investigations in phononic devices, energy harvesting and thermal transport studies of low-dimensional TMDs. Standard four-probe technique was used for the electrical resistivity measurements at low temperatures in a physical property measurement system PPMS-9, Quantum Design.
TDTR is a convenient and non-contact method to measure the thermal conductivities of bulk materials, 46 thin films, 47 and even liquid samples.
Hysteresis and Phase Transitions
The pump beam heats up the surface of the Al film and then the probe beam profiles the time-domain evolution of temperature on the surface by detecting its optical reflectivity which is proportional to the temperature of the Al surface. We have measured a series of bulk and thin-film standard samples to verify the accuracy and reliability of our system. Particularly, we have also measured the thermal conductivity of 2H-WSe 2 single crystal to confirm the reliability of our TDTR measurements in such layered materials. Wen, Z. Fert, A. Nobel lecture: origin, development, and future of spintronics.
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Evidence for hysteresis behaviour and anomaly of thermal conductivity in Y-Ba-Cu-O superconductor. Solid State Commun 71 , — Misiorek, H. Hysteresis of thermal conductivity and electrical resistivity of niobium hydrides. Solid State Commun 85 , —