Physics – Condensed Matter – Superconductivity
Scientific paper
2002-06-05
Phys. Rev. B. 66, 134101 (2002)
Physics
Condensed Matter
Superconductivity
9 pages, 7 EPS figures, revtex4
Scientific paper
10.1103/PhysRevB.66.134101
The effect of high pressures to 40 GPa on the crystal structure and lattice dynamics of AlB2 was studied by synchrotron x-ray powder diffraction, Raman spectroscopy, and first-principles calculations. There are no indications for a pressure-induced structural phase transition. The Raman spectra of the metallic sample exhibit a well-defined peak near 980 cm^{-1} at 0 GPa which can be attributed to the Raman-active E_{2g} zone-center phonon. Al deficiency of ~11% in AlB2, as indicated by the x-ray data, changes qualitatively the electronic structure, and there are indications that it may have a sizable effect on the pressure dependence of the E_{2g} phonon frequency. Similar changes of the pressure dependence of phonon frequencies, caused by non-stoichiometry, are proposed as an explanation for the unusually large variation of the pressure dependence of T_c for different samples of MgB2.
Bouvier Pierre
Kunc K.
Loa Ingo
Syassen K.
No associations
LandOfFree
Crystal structure and lattice dynamics of AlB2 under pressure and implications for MgB2 does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Crystal structure and lattice dynamics of AlB2 under pressure and implications for MgB2, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Crystal structure and lattice dynamics of AlB2 under pressure and implications for MgB2 will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-574090