Coupling of phonons with orbital dynamics and magnetism in CuSb2O6

Strongly interacting phonons and orbital excitations are observed in the same energy range for CuSb2O6, unlocking a so-far unexplored type of electron-phonon interaction. An orbital wave at ∼550cm−1 softens on warming and strongly interferes with a phonon at ∼500cm−1, giving rise to a merged excitat...

Full description

Saved in:
Bibliographic Details
Published in:Physical review. B 2018-05, Vol.97 (17)
Main Authors: Maimone, D T, Christian, A B, Neumeier, J J, Granado, E
Format: Article
Language:English
Subjects:
Electron phonon interactions
Magnetism
Phonons
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Strongly interacting phonons and orbital excitations are observed in the same energy range for CuSb2O6, unlocking a so-far unexplored type of electron-phonon interaction. An orbital wave at ∼550cm−1 softens on warming and strongly interferes with a phonon at ∼500cm−1, giving rise to a merged excitation of mixed character. An electronic continuum grows on warming to the orbital ordering temperature TOO=400 K, generating an important phonon decay channel. This direct and simultaneous observation of orbital and vibrational excitations reveals details of their combined dynamics. In addition, phonon frequency anomalies due to magnetic correlations are observed below ∼150 K, much above the three-dimensional magnetic ordering temperature TN3D=8.5 K, confirming one-dimensional magnetic correlations along Cu-O-O-Cu linear chains in the paramagnetic state.
ISSN:2469-9950
2469-9969
DOI:10.1103/PhysRevB.97.174415