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Scanning tunneling microscopy in the superconductor LaSb2

TitleScanning tunneling microscopy in the superconductor LaSb2
Publication TypeJournal Article
Year of Publication2013
AuthorsGalvis, JA, Suderow, H, Vieira, S, Bud'ko, SL, Canfield, PC
JournalPhysical Review B
Date Published06
Type of ArticleArticle
ISBN Number1098-0121
Accession NumberWOS:000320105000003
Keywordscrystals, magnetic-properties, magnetoresistance, Spectroscopy

We present very low temperature (0.15 K) scanning tunneling microscopy and spectroscopy experiments in the layered superconductor LaSb2. We obtain topographic microscopy images with surfaces showing hexagonal and square atomic size patterns, and observe in the tunneling conductance a superconducting gap. We find well defined quasiparticle peaks located at a bias voltage comparable to the weak coupling s-wave BCS expected gap value (0.17 meV). The amount of states at the Fermi level is however large and the curves are significantly broadened. We find T-c of 1.2 K by following the tunneling conductance with temperature.

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