Carrier Transport in Magnesium Diboride: Role of Nano-inclusions
| Autor: | Awasthi, A. M., Bhardwaj, S., Awana, V. P. S., Albisetti, A. Figini, Giunchi, G., Narlikar, A. V. |
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| Rok vydání: | 2012 |
| Předmět: | |
| Zdroj: | Appl. Phys. Lett. 103, 112601 (2013) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1063/1.4821135 |
| Popis: | Anisotropic-gap and two-band effects smear out the superconducting transition (Tc) in literature reported thermal conductivity of MgB2, where large electronic contributions also suppress anomaly-manifestation in their negligible phononic-parts. Present thermal transport results on scarcely explored specimens featuring nano-inclusions exhibit a small but clear Tc-signature, traced to relatively appreciable phononic conduction, and its dominant electronic-scattering. The self-formed MgO as extended defects strongly scatter the charge carriers and minutely the phonons with their longer-mean-free-path near Tc. Conversely, near room temperature, the shorter-dominant-wavelength phonon's transport is hugely affected by these nanoparticles, undergoing ballistic to diffusive crossover and eventually entering the Ioffe-Regel mobility threshold regime. Comment: 14 pages, 4 figures, 28 references |
| Databáze: | arXiv |
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