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

Autor:	Samanta, Kousik, Rigitano, Danilo, Pagliuso, Pascoal Jose Giglio, Granado, Eduardo
Rok vydání:	2018
Předmět:	Condensed Matter - Strongly Correlated Electrons
Druh dokumentu:	Working Paper
DOI:	10.1063/1.5094912
Popis:	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. Comment: 5 pages and 6 figures
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/1812.06006 Zobrazit plný text záznamu View this record from Arxiv