Bonding states underpinning structural transitions in IrTe2 observed with micro-ARPES

DOI: 10.1103/PhysRevB.110.205123

Authors: C. W. Nicholson (University of Fribourg and Fribourg Centre for Nanomaterials; Fritz-Haber-Institut der Max-Planck-Gesellscahft) , M. D. Watson (Diamond Light Source) , A. Pulkkinen (University of Fribourg and Fribourg Centre for Nanomaterials; University of West Bohemia) , M. Rumo (University of Fribourg and Fribourg Centre for Nanomaterials) , G. Kremer (University of Fribourg and Fribourg Centre for Nanomaterials; Institut Jean Lamour, UMR 7198, Centre National de la Recherche Scientifique-Université de Lorraine) , K. Y. Ma (Max Planck Institute for Chemical Physics of Solids) , F. O. Von Rohr (University of Geneva) , C. Cacho (Diamond Light Source) , C. Monney (University of Fribourg and Fribourg Centre for Nanomaterials)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Physical Review B , VOL 110

State: Published (Approved)
Published: November 2024
Diamond Proposal Number(s): 25906

Abstract: Competing interactions in low-dimensional materials can produce nearly degenerate electronic and structural phases. We investigate structural phase transitions in layered IrTe2 for which a number of potential transition mechanisms have been postulated. The spatial coexistence of multiple phases on the micron scale has prevented a detailed analysis of the electronic structure. By exploiting micro-angle-resolved photoemission spectroscopy obtained with synchrotron radiation we extract the electronic structure of the multiple structural phases in IrTe2 in order to address the mechanism underlying the phase transitions. We find direct evidence of lowered energy states that appear in the low-temperature phases, states previously predicted by ab initio calculations and extended here. Our results validate a proposed scenario of bonding and antibonding states as the driver of the phase transitions.

Journal Keywords: Charge order; Electronic structure; Phase transitions; Angle-resolved photoemission spectroscopy

Subject Areas: Materials, Physics


Instruments: I05-ARPES

Added On: 13/11/2024 15:11

Documents:
PhysRevB.110.205123.pdf

Discipline Tags:

Physics Hard condensed matter - structures Magnetism Materials Science

Technical Tags:

Spectroscopy Angle Resolved Photoemission Spectroscopy (ARPES) X-ray Photoelectron Spectroscopy (XPS)