Isospin-phonon coupling and Fano-interference in spin-orbit Mott insulator Sr2IrO4

Kousik Samanta; Danilo Rigitano; Pascoal Jose Giglio Pagliuso; Eduardo Granado

doi:10.1063/1.5094912

Isospin-phonon coupling and Fano-interference in spin-orbit Mott insulator Sr2IrO4

Strongly Correlated Electrons 2019-04-23 v2

Authors: Kousik Samanta , Danilo Rigitano , Pascoal Jose Giglio Pagliuso , Eduardo Granado

View on arXiv ↗ PDF ↗ DOI ↗

Abstract

The isospin-phonon coupling in Sr2IrO4 is investigated by temperature dependent phonon Raman scattering. Anomalous behavior in the frequency of all studied optical phonons is observed below the magnetic transition temperature TN ~240 K. The strongest effect is detected for the A1g mode at 272 cm-1 associated with the modulation of the Ir-O-Ir bond angle. Additionally, the A1g mode at 560 cm-1 shows a Fano asymmetric lineshape sensitive to TN, supporting the existence of low-energy (~70 meV) electronic excitations that are renormalized by the magnetic order. These results reveal new aspects of the interaction between the crystal lattice and electronic degrees of freedom in this spin-orbit entangled Mott insulator.

Keywords

isospin-phonon coupling sr2iro4 fano interference mott insulator raman scattering spin-orbit coupling

Cite

@article{arxiv.1812.06006,
  title  = {Isospin-phonon coupling and Fano-interference in spin-orbit Mott insulator Sr2IrO4},
  author = {Kousik Samanta and Danilo Rigitano and Pascoal Jose Giglio Pagliuso and Eduardo Granado},
  journal= {arXiv preprint arXiv:1812.06006},
  year   = {2019}
}

Comments

5 pages and 6 figures

Isospin-phonon coupling and Fano-interference in spin-orbit Mott insulator Sr2IrO4

Abstract

Keywords

Cite

Comments

Related papers