Low-Temperature Thermodynamic Properties of Vanadium. I. Superconducting and Normal States

Radebaugh, Ray; Keesom, P. H.

doi:10.1103/physrev.149.209

Cited by 121 publications

(36 citation statements)

References 29 publications

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“…Just below the critical temperature the GL parameter of clean niobium is 0.76 while that of vanadium is 0.848. 14,15 These two metals constitute the only two clean type-II superconductors presently known and both have relatively small values of K.…”

Section: {I(d/dt) -(R< 3 >/2^)[(p-(e/c)a(r)r«>y-faplmentioning

confidence: 99%

Scattering of Single-Particle Excitations by a Vortex in a Clean Type-II Superconductor

Cleary

1968

Phys. Rev.

100

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A study of the scattering of BCS single-particle excitations by an isolated vortex in a clean type-II superconductor is reported. The coupled Bogoliubov equations provide a theoretical framework for calculating quasiparticle wave functions. The vortex introduces superfluid velocity into the metal, depresses the order parameter A(r) at the core, and gives rise to a Bohm-Aharonov effect. The scattering problem has two channels with coupling between particlelike and holelike excitations. The total cross section diverges because of the Bohm-Aharonov effect, but the cross section

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Section: {I(d/dt) -(R< 3 >/2^)[(p-(e/c)a(r)r«>y-faplmentioning

confidence: 99%

Scattering of Single-Particle Excitations by a Vortex in a Clean Type-II Superconductor

Cleary

1968

Phys. Rev.

100

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“…4. In the early sixties there have been experimental claims for the observation of two-band superconductivity in some transition metals like e.g. V, Nb and Ta 5,6 and later in oxygen depleted SrTiO 3 . 7…”

Section: Introductionmentioning

confidence: 99%

Thermodynamics of two-band superconductors: The case ofMgB2

et al. 2005

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Thermodynamic properties of the multiband superconductor MgB 2 have often been described using a simple sum of the standard BCS expressions corresponding to σ-and π-bands. Although, it is a priori not clear if this approach is working always adequately, in particular in cases of strong interband scattering. Here we compare the often used approach of a sum of two independent bands using BCS-like α-model expressions for the specific heat, entropy and free energy to the solution of the full Eliashberg equations. The superconducting energy gaps, the free energy, the entropy and the heat capacity for varying interband scattering rates are calculated within the framework of two-band Eliashberg theory. We obtain good agreement between the phenomenological two-band α-model with the Eliashberg results, which delivers for the first time the theoretical verification to use the α-model as a useful tool for a reliable analysis of heat capacity data. For the thermodynamic potential and the entropy we demonstrate that only the sum over the contributions of the two bands has physical meaning.

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“…The dashed line indicates the behavior of a bulk material and is taken from ref. 12. As a comparison, the data for vanadium on glass are shown where no epitaxial growth is expected.…”

Section: Spje Vol 2006 / 215mentioning

confidence: 97%

<title>Progress on detectors with superconducting tunnel junctions</title>

Kraus

Jochum²,

Kemmather³

et al. 1993

SPIE Proceedings

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Superconducting tunnel junctions as sensitive elements in detectors intended for application to X-ray astronomy provide the possibility to improve the energy resolution by more than one order of magnitude compared to standard semiconductor detectors. We present our results with a detector system consisting of a separate absorber film and superconducting aluminum tunnel junctions attached to its edges. The arrangement of our detector, exploiting 'quasiparticle trapping', provides position resolution in addition to very high energy resolution. Progress in resolving power is expected as a result of the implementation of our epitaxially grown vanadium absorber films, exhibiting a long mean free path for electrons. Details of the absorber film fabrication are discussed and several methods of characterizing the quality of our absorber films are presented. In addition to the experimental results with our detectors, we report on our model of electronic noise in tunnel junctions.

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Low-Temperature Thermodynamic Properties of Vanadium. I. Superconducting and Normal States

Cited by 121 publications

References 29 publications

Scattering of Single-Particle Excitations by a Vortex in a Clean Type-II Superconductor

Scattering of Single-Particle Excitations by a Vortex in a Clean Type-II Superconductor

Thermodynamics of two-band superconductors: The case ofMgB2

<title>Progress on detectors with superconducting tunnel junctions</title>

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