Abstract:
:Compounds with incommensurate structural modulations have been extensively studied in last several decades. However, the relationship between structurally incommensurate/commensurate phases and associated electronic states remains enigmatic. Here we report the coexisting of complex incommensurate structures and highly unusual electronic roughness on the surface of in situ cleaved IrTe₂ by using scanning tunnelling microscopy/spectroscopy, corroborated with extensive density-functional theory calculations. This behaviour is traced to structural instability, which induces a structural transition from a trigonal to a triclinic lattice below transition temperature, giving rise to the formation of unidirectional structural modulations with distinct wavelengths, accompanied by the opening of a 'pseudo'-gap in the surface layer. With further cooling the surface adopts a structure that reflects an ~6 × periodicity that is different from the bulk 5 × periodicity. Calculations show that the structure distortion is not associated with a charge density wave, but is rather associated with Te p-electron bonding.
journal_name
Nat Communjournal_title
Nature communicationsauthors
Li Q,Lin W,Yan J,Chen X,Gianfrancesco AG,Singh DJ,Mandrus D,Kalinin SV,Pan Mdoi
10.1038/ncomms6358subject
Has Abstractpub_date
2014-11-07 00:00:00pages
5358issn
2041-1723pii
ncomms6358journal_volume
5pub_type
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