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

作者：Das Lopamudra^*; Mateo Jennette; Bandyopadhyay Saumil; Bandyopadhyay Supriyo; Edwards Jarrod D; Anderson John

来源：Applied Physics Letters, 2011, 98(6): 063109.

DOI：10.1063/1.3554753

The ensemble averaged spin dephasing rate of localized electrons in the organic molecule tris(8-hydroxyquinoline aluminum) or Alq(3) 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. B 78, 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.

• 出版日期2011-2-7