Anisotropic vibrations in crystalline and amorphous InP

Simple item page
dc.contributor.authorSchnohr, CSen_AU
dc.contributor.authorKluth, Pen_AU
dc.contributor.authorAraujo, LLen_AU
dc.contributor.authorSprouster, DJen_AU
dc.contributor.authorByrne, APen_AU
dc.contributor.authorForan, GJen_AU
dc.contributor.authorRidgway, MCen_AU
dc.date.accessioned2009-06-22en_AU
dc.date.accessioned2010-04-30T05:04:19Zen_AU
dc.date.available2009-06-22en_AU
dc.date.available2010-04-30T05:04:19Zen_AU
dc.date.issued2009-05en_AU
dc.date.statistics2009-05en_AU
dc.description.abstractThe temperature-dependent evolution of atomic vibrations in crystalline and amorphous InP has been studied using extended x-ray absorption fine-structure (EXAFS) spectroscopy. Measurements were performed at the In K edge for temperatures in the range of 20-295 K. In crystalline InP, the first nearest-neighbor (NN) EXAFS Debye-Waller factor, representative of the correlated mean-square relative displacement (MSRD) parallel to the bond direction, is considerably smaller than the uncorrelated mean-square displacement (MSD) determined from x-ray diffraction measurements. In contrast, the MSRD perpendicular to the bond direction agrees well with the MSD. This clearly demonstrates that vibrations of two neighboring atoms relative to each other are strongly reduced along the bond direction but are unhindered perpendicular to it, consistent with the well-known behavior of III-V semiconductors where bond bending is energetically favored over bond stretching. With increasing interatomic distance, the correlation of atomic motion quickly vanishes as manifested by increased EXAFS Debye-Waller factors. For the third NN shell the value closely approaches the MSD demonstrating the nearly uncorrelated motion of atoms only three shells apart. In the amorphous phase, only information about the first NN shell is accessible although the latter is now comprised of both P and In atoms. The EXAFS Debye-Waller factors are significantly higher than in the crystalline phase but exhibit a very similar temperature dependence. This results from strongly increased structural disorder in the amorphous phase whereas the thermally induced disorder is very similar to that in crystalline InP. A correlated Einstein model was fitted to the Debye-Waller factors yielding Einstein temperatures that vary as functions of the vibrational phase difference and reduced mass of the atomic pair, and represent a measure of the strength and thermal evolution of the corresponding relative vibrations. © 2009, American Physical Societyen_AU
dc.identifier.citationSchnohr, C. S., Kluth, P., Araujo, L. L., Sprouster, D. J., Byrne, A. P., Foran, G. J., & Ridgway, M. C. (2009). Anisotropic vibrations in crystalline and amorphous InP. Physical Review B, 79(19), 10. doi:10.1103/PhysRevB.79.195203en_AU
dc.identifier.govdoc1280en_AU
dc.identifier.issn1098-0121en_AU
dc.identifier.issue19en_AU
dc.identifier.journaltitlePhysical Review Ben_AU
dc.identifier.pagination10en_AU
dc.identifier.urihttp://dx.doi.org/10.1103/PhysRevB.79.195203en_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/1450en_AU
dc.identifier.volume79en_AU
dc.language.isoenen_AU
dc.publisherAmerican Physical Societyen_AU
dc.subjectAnisotropyen_AU
dc.subjectThermal expansionen_AU
dc.subjectChemical bondsen_AU
dc.subjectIndium compoundsen_AU
dc.subjectVibrational statesen_AU
dc.subjectAmorphous stateen_AU
dc.titleAnisotropic vibrations in crystalline and amorphous InPen_AU
dc.typeJournal Articleen_AU
Files
License bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
license.txt
Size:
1.79 KB
Format:
Plain Text
Description:
Download
Collections
Journal Articles