Superconductor-insulator transition tuned by annealing in Bi-film on top of Co-clusters

Herrera, W. T.; Dinóla, I. S.; Continentino, M. A.; Micklitz, H.; Xing, Yutao; Fontes, M. B.; Baggio-Saitovitch, E.

doi:10.1140/epjb/e2013-40337-3

Cited by 2 publications

(2 citation statements)

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“…Could this imply that a-Bi is more metallic than x-Bi ? Recent experimental results [ 34 ] corroborate this surmise, and indicate that despite the disorder in the amorphous there are non-localized electrons at the Fermi level.…”

Section: Resultsmentioning

confidence: 62%

“…One may also argue that the increment of N ( E F ) in the amorphous may not be relevant for the mobility of the electrons which could be inhibited by the disorder that fosters a localization phenomenon in this phase, or that not all low frequency modes in the amorphous will contribute to the coupling α 2 ( ω ) since there may also be some localization of the vibrational states. However recent experimental results [ 34 ] indicate that the transition from crystallinity to amorphicity entails a transition from semimetallic to metallic behaviour which points to the fact that the disorder in the amorphous does not hinder this transition.…”

Section: Discussionmentioning

confidence: 99%

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Superconductivity in Bismuth. A New Look at an Old Problem

Mata-Pinzón

Valladares

2016

PLoS ONE

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To investigate the relationship between atomic topology, vibrational and electronic properties and superconductivity of bismuth, a 216-atom amorphous structure (a-Bi216) was computer-generated using our undermelt-quench approach. Its pair distribution function compares well with experiment. The calculated electronic and vibrational densities of states (eDOS and vDOS, respectively) show that the amorphous eDOS is about 4 times the crystalline at the Fermi energy, whereas for the vDOS the energy range of the amorphous is roughly the same as the crystalline but the shapes are quite different. A simple BCS estimate of the possible crystalline superconducting transition temperature gives an upper limit of 1.3 mK. The e-ph coupling is more preponderant in a-Bi than in crystalline bismuth (x-Bi) as indicated by the λ obtained via McMillan’s formula, λc = 0.24 and experiment λa = 2.46. Therefore with respect to x-Bi, superconductivity in a-Bi is enhanced by the higher values of λ and of eDOS at the Fermi energy.

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Section: Resultsmentioning

confidence: 62%

Section: Discussionmentioning

confidence: 99%