Motional modes in bulk powder and few-molecule clusters of tris(8-hydroxyquinoline aluminum) and their relation to spin dephasing

Authors

Lopamurda Das, Virginia Commonwealth University
Jennette Mateo, Virginia Commonwealth University
Saumil Bandyopadhyay, Virginia Commonwealth University
Supriyo Bandyopadhyay, Virginia Commonwealth University
Jarrod D. Edwards, US Army Engineer Research and Development Center
John Anderson, US Army Engineer Research and Development Center

Document Type

Article

Original Publication Date

2011

Journal/Book/Conference Title

Applied Physics Letters

Volume

98

Issue

6

DOI of Original Publication

10.1063/1.3554753

Comments

Originally published at http://dx.doi.org/10.1063/1.3554753

Date of Submission

April 2015

Abstract

The ensemble averaged spin dephasing rate of localized electrons in the organic molecule tris(8-hydroxyquinoline aluminum) or Alq3 has been found to be significantly larger in bulk powder than in single- or few-molecule clusters confined within 1–2 nm sized nanocavities [B. Kanchibotla et al., Phys. Rev. B78, 193306 (2008)]. To understand this observation, we have compared the midinfrared absorption spectra of bulk powder and single- or few-molecule clusters. It appears that molecules have additional vibrational modes in bulk powder possibly due to multimerization. Their coupling with spin may be responsible for the increased spin dephasing rate in bulk powder.

Rights

Das, L., Mateo, J., Bandyopadhyay, S., et al. Motional modes in bulk powder and few-molecule clusters of tris(8-hydroxyquinoline aluminum) and their relation to spin dephasing. Applied Physics Letters, 98, 063109 (2011). Copyright © 2011 AIP Publishing LLC.

Is Part Of

VCU Electrical and Computer Engineering Publications