Phonons in MgB2 by polarized Raman scattering on single crystals
J. Hlinka, I. Gregora, J. Pokorný, A. Plecenik, P. Kúš, L. Satrapinsky, Š. Beňačka
DOI 10.1103/PhysRevB.64.140503 · Physical Review B
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Abstract
This paper presents a detailed Raman scattering study of the unusually broad E2g phonon mode in MgB2 crystal. It is shown by polarized Raman scattering on a few-micron-size crystallites with natural faces that the observed broad Raman feature really does obey the selection rules of an E2g mode. Raman spectra on high quality polycrystalline superconducting MgB2 wires reveal a very symmetric E2g phonon line near 615 cm−1 with the room temperature linewidth of 260 cm−1 only. Additional scattering of different polarization dependence, observed in certain crystallites, is interpreted as weighted phonon density of states induced by lattice imperfections.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| MgB2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 40 | Pressure not reported | unknown |
| MgB2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 38 | Pressure not reported | onset |
| MgB2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 37 | Pressure not reported | zero_resistance |
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