Anomalous Thermal Conductivity in Superconducting Niobium

Carlson, Joe; Satterthwaite, C. B.

doi:10.1103/physrevlett.24.461

Cited by 40 publications

(5 citation statements)

References 8 publications

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“…The severe shortening of the electronic mean free path [115] made fulfilling the conditions for ballistic conduction to be more and more difficult. In the most irradiated sample, even the contact with the highest normal-state resistance (40 ) turned out to be in the intermediate regime and showed the typical dips at V > V peak [32], as well as a moderate heating, which was shown to be negligible as long as the voltage drop at the junction was of the order of V peak [19]. The trend of the gaps as a function of T A c is shown in figure 21(b) (circles).…”

Section: Effects Of Irradiation On the Gaps Of Mgb 2 The Effects Of ...mentioning

confidence: 99%

“…After the publication of the theory for two-band superconductivity, some of its consequences on various measurable quanti-ties were calculated and possible marks of multiband superconductivity were found in conventional materials like Nb [39,40]. In 1980 clearer experimental evidence of multiband superconductivity was found in Nb-doped SrTiO 3 [41] by means of tunnel spectroscopy.…”

Section: Magnesium Diboridementioning

confidence: 99%

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Probing multiband superconductivity by point-contact spectroscopy

Daghero

Gonnelli

2010

Supercond. Sci. Technol.

237

316

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Point-contact spectroscopy was originally developed for the determination of the electron-phonon spectral function in normal metals. However, in the past 20 years it has become an important tool in the investigation of superconductors. As a matter of fact, point contacts between a normal metal and a superconductor can provide information on the amplitude and symmetry of the energy gap that, in the superconducting state, opens up at the Fermi level. In this paper we review the experimental and theoretical aspects of point-contact spectroscopy in superconductors, and we give an experimental survey of the most recent applications of this technique to anisotropic and multiband superconductors.

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Section: Effects Of Irradiation On the Gaps Of Mgb 2 The Effects Of ...mentioning

confidence: 99%

Section: Magnesium Diboridementioning

confidence: 99%

Probing multiband superconductivity by point-contact spectroscopy

Daghero

Gonnelli

2010

Supercond. Sci. Technol.

237

316

View full text Add to dashboard Cite

show abstract

“…All these superconductors have complex crystallographic structures and complex Fermi surfaces. In this context it is interesting to note here that a two-band model was once considered for understanding the superconductivity in elemental body centered cubic (bcc) Niobium [16]. However, to the best of our knowledge the same framework has not been used so far to investigate the superconducting properties in other cubic metals and solid solution alloys.…”

Section: Introductionmentioning

confidence: 99%

Evidence of multiband superconductivity in theβ-phase Mo_1−xRe_xalloys

Sundar

Chandra

Chattopadhyay

et al. 2015

J. Phys.: Condens. Matter

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We present a detailed study of the superconducting properties in the β-phase Mo(1-x)Re(x) (x = 0.25 and 0.4) solid solution alloys pursued through magnetization and heat capacity measurements. The temperature dependence of the upper critical field H(C2)(T) in these binary alloys shows a deviation from the prediction of the Werthamer-Helfand-Hohenberg (WHH) theory. The temperature dependence of superfluid density estimated from the variation of lower critical field H(C1) with temperature, cannot be explained within the framework of a single superconducting energy gap. The heat capacity also shows an anomalous feature in its temperature dependence. All these results can be reasonably explained by considering the existence of two superconducting energy gaps in these Mo(1-x)Re(x) alloys. Initial results of electronic structure calculations and resonant photoelectron spectroscopy measurements support this possibility and suggest that the Re-5d like states at the Fermi level may not intermix with the Mo-5p and 5s like states in the β-phase Mo(1-x)Re(x) alloys and contribute quite distinctly to the superconductivity of these alloys.

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“…Nb leads have been used for thermal insulation in circuits combining superconduting and normal state elements 36 37 . Previous measurements of bulk thermal conductivity in superconducting single-crystal Nb have showed anomalous behavior that has been attributed to phonon conductance 38 39 . However, no quantitative study of the residual electronic thermal conductance has been presented.…”

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confidence: 99%

Thermal conductance of Nb thin films at sub-kelvin temperatures

Feshchenko

Saira

Peltonen

et al. 2017

Sci Rep

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We determine the thermal conductance of thin niobium (Nb) wires on a silica substrate in the temperature range of 0.1–0.6 K using electron thermometry based on normal metal-insulator-superconductor tunnel junctions. We find that at 0.6 K, the thermal conductance of Nb is two orders of magnitude lower than that of Al in the superconducting state, and two orders of magnitude below the Wiedemann-Franz conductance calculated with the normal state resistance of the wire. The measured thermal conductance exceeds the prediction of the Bardeen-Cooper-Schrieffer theory, and demonstrates a power law dependence on temperature as T4.5, instead of an exponential one. At the same time, we monitor the temperature profile of the substrate along the Nb wire to observe possible overheating of the phonon bath. We show that Nb can be successfully used for thermal insulation in a nanoscale circuit while simultaneously providing an electrical connection.

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Anomalous Thermal Conductivity in Superconducting Niobium

Cited by 40 publications

References 8 publications

Probing multiband superconductivity by point-contact spectroscopy

Probing multiband superconductivity by point-contact spectroscopy

Evidence of multiband superconductivity in theβ-phase Mo_1−xRe_xalloys

Thermal conductance of Nb thin films at sub-kelvin temperatures

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Anomalous Thermal Conductivity in Superconducting Niobium

Cited by 40 publications

References 8 publications

Probing multiband superconductivity by point-contact spectroscopy

Probing multiband superconductivity by point-contact spectroscopy

Evidence of multiband superconductivity in theβ-phase Mo1−xRexalloys

Thermal conductance of Nb thin films at sub-kelvin temperatures

Contact Info

Product

Resources

About

Evidence of multiband superconductivity in theβ-phase Mo_1−xRe_xalloys