Inelastic electron lifetime in niobium films

Dalrymple, B.J.; Wolf, Stuart A.; Ehrlich, A. C.; Gillespie, D. J.

doi:10.1103/physrevb.33.7514

Cited by 21 publications

(2 citation statements)

References 34 publications

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“…a o / a s = m/n and n = m i l (8) where n and m are integers, then the interface can be divided into units of length ma, (or na,,). In some of the units overgrowth atoms strain to lie at atomic sites in the substrate and in the other units interfacial dislocations with Burgers vector of kao/m (or f a,/n) are generated.…”

Section: Epitaxialgrowthmentioning

confidence: 99%

Superconductivity and transport properties in ultrathin epitaxial single-crystal niobium films

Jiang

Xie

Zhang

et al. 1990

J. Phys.: Condens. Matter

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Pure and high-quality single-crystal Nb(001) thin films with thicknesses ranging from 40 8, to 1000 8, were grown epitaxially on NaCl(001) substrates by an UHV e-beam evaporation technique. TEM observations, resistivity and superconducting transition temperature measurements were carried out. A drastic fall-off in transition temperature and conductivity was observed in ultrathin single-crystal Nb films. The results are discussed within the framework of the existing theories and a strain-induced 'double-layer' model is proposed. Data for polycrystalline Nb thin films on glass substrates deposited under exactly the same evaporation conditions as the single-crystal films are also presented for comparison. * Work supported by the National Science Foundation of the People's Republic of China. t Graduate Students.

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Section: Epitaxialgrowthmentioning

confidence: 99%

Superconductivity and transport properties in ultrathin epitaxial single-crystal niobium films

Jiang

Xie

Zhang

et al. 1990

J. Phys.: Condens. Matter

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“…Here, we use scaling analysis to study the B-induced SMT in the thin niobium (Nb) films. This issue has not been investigated before, despite many studies devoted in the past to properties of Nb films [26][27][28][29][30][31][32][33][34][35][36][37] . The films studied here, with thickness d between 1.2 nm and 20 nm, are sandwiched between two Si barrier layers of 10 nm to prevent oxidation, as described recently 38 .…”

Section: Introductionmentioning

confidence: 99%

Upper critical field and superconductor-metal transition in ultrathin niobium films

Zaytseva,

Abaloszew,

Camargo

et al. 2019

Preprint

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The upper critical field (Hc2) and the magnetic field induced superconductor-metal transition (SMT) are studied in ultrathin Nb films of thickness d ranging from 1.2 nm to 20 nm, which undergo a transition from polycrystalline to amorphous structure at the thickness d ≃ 3.3 nm. The Hc2 is found to be orbitally limited in polycrystalline films, and paramagnetically limited in the amorphous films. The SMT is observed in all films with d < 11.3 nm, with the critical field Bc approximately constant in polycrystalline films, and decreasing as a power-law with the film conductance G in the amorphous films. The scaling analysis identifies two different critical regimes in the amorphous films, with the critical exponents consistent with (2+1)D XY model for a 2D superconductor in the clean (disordered) limit at high (low) temperatures, respectively; in addition, at the lowest T quantum metal phase is observed. These results suggest inhomogeneous nature of the amorphous films, in the form of superconducting islands immersed in the metallic background. Some unusual features, not observed in other systems, include the suppression of SC correlations on cooling, and the exponent of the power law in the dependence of Bc on G, which differs from theoretical predictions. These features may be caused by paramagnetic pair breaking, or by the proximity of quantum metal phase.

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30Mei1 - 73Kit1

Flükiger¹,

Wolf²

Nb, Nb-Al - Nb-Ge

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Inelastic electron lifetime in niobium films

Cited by 21 publications

References 34 publications

Superconductivity and transport properties in ultrathin epitaxial single-crystal niobium films

Superconductivity and transport properties in ultrathin epitaxial single-crystal niobium films

Upper critical field and superconductor-metal transition in ultrathin niobium films

30Mei1 - 73Kit1

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