You are here

Observation of unreconstructed square atomic square lattice in Ca(Fe0.965Co0.035)(2)As-2 cleaved at very low temperatures

TitleObservation of unreconstructed square atomic square lattice in Ca(Fe0.965Co0.035)(2)As-2 cleaved at very low temperatures
Publication TypeJournal Article
Year of Publication2014
AuthorsFente, A, Guillamon, I, Ran, S, Vieira, S, Suderow, H, Bud'ko, SL, Canfield, PC
Journal27th International Conference on Low Temperature Physics (Lt27), Pts 1-5
Volume568
Pagination022046
Date Published12
Type of ArticleProceedings Paper
ISBN Number1742-6588
Accession NumberWOS:000351433700077
Keywordsstate, superconductor
Abstract

Scanning tunneling microscopy (STM) has been by now made in many pnictide layered superconductors. In AFe(2)As(2) (A=Ca, Sr, Ba), surface reconstructions dominate the STM topographic images and no surface termination with the bulk atomic lattice has been reported. Here, we present STM measurements on the surface of Ca(Fe0.965Co0.035)(2)As-2 cleaved in-situ below liquid helium temperatures. We observe the ubiquitous surface reconstruction consisting of 1D stripes that can adopt two degenerate orientations with respect to the crystal lattice. By searching over many different scanning windows, we find that low temperature cleaving also exposes surfaces showing the As unreconstructed lattice of the bulk tetragonal crystal, over areas of some tens of nm lateral size.

DOI10.1088/1742-6596/568/2/022046
Custom 1

Complex States