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Anisotropic type-I superconductivity and anomalous superfluid density in OsB2

TitleAnisotropic type-I superconductivity and anomalous superfluid density in OsB2
Publication TypeJournal Article
Year of Publication2016
AuthorsBekaert, J, Vercauteren, S, Aperis, A, Komendova, L, Prozorov, R, Partoens, B, Milosevic, MV
JournalPhysical Review B
Date Published10
Type of ArticleArticle
ISBN Number2469-9950
Accession NumberWOS:000385622500009
Keywordslattice, metals, mgb2, physics, temperature

reveal that OsB2 is a distinctly type-I superconductor with a very low Ginzburg-Landau parameter kappa-a rare property among compound materials. We show that the found coherence length and penetration depth corroborate the measured thermodynamic critical field. Moreover, our calculation of the superconducting gap structure using anisotropic Eliashberg theory and ab initio calculated electron-phonon interaction as input reveals a single but anisotropic gap. The calculated gap spectrum is shown to give an excellent account for the unconventional behavior of the superfluid density of OsB2 measured in experiments as a function of temperature. This reveals that gap anisotropy can explain such behavior, observed in several compounds, which was previously attributed solely to a two-gap nature of superconductivity.

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Alternate JournalPhys. Rev. B