Kinetic Phenomena in Superconductors

Geilikman, B.T.; Kresin, Vladimir Z.

doi:10.1070/pu1970v012n05abeh003956

Cited by 41 publications

(46 citation statements)

References 2 publications

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“…We note from Eqs. (9,(17)(18)(19)(20), that the evaluation of T c for a specific compound needs the knowledge of following parameters: the interlayer distance L, the band mass m b and Fermi velocity v F , and the dielectric constant of the spacers ǫ M . In addition, the evaluation of the phonon contribution to the pairing requires the knowledge of the characteristic phonon frequency Ω, the electron-phonon coupling constant λ and the Coulomb pseudopotential µ ⋆ .…”

Section: B Intercalated Metal Halide Nitridesmentioning

confidence: 99%

Electronic collective modes and superconductivity in layered conductors

2003

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A distinctive feature of layered conductors is the presence of low-energy electronic collective modes of the conduction electrons. This affects the dynamic screening properties of the Coulomb interaction in a layered material. We study the consequences of the existence of these collective modes for superconductivity. General equations for the superconducting order parameter are derived within the strong-coupling phonon-plasmon scheme that account for the screened Coulomb interaction. Specifically, we calculate the superconducting critical temperature Tc taking into account the full temperature, frequency and wave-vector dependence of the dielectric function. We show that low-energy plasmons may contribute constructively to superconductivity. Three classes of layered superconductors are discussed within our model: metal-intercalated halide nitrides, layered organic materials and high-Tc oxides. In particular, we demonstrate that the plasmon contribution (electronic mechanism) is dominant in the first class of layered materials. The theory shows that the description of so-called "quasi-two-dimensional superconductors" cannot be reduced to a purely 2D model, as commonly assumed. While the transport properties are strongly anisotropic, it remains essential to take into account the screened interlayer Coulomb interaction to describe the superconducting state of layered materials.

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Section: B Intercalated Metal Halide Nitridesmentioning

confidence: 99%

Electronic collective modes and superconductivity in layered conductors

2003

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“…While the theory of multigap superconductivity was proposed 46 years ago and more than 200 papers on the subject [see ref. 2 for the reference list] have been published these phenomena do not appear in the experimental investigation of homogeneous superconducting elements and alloys since inelastic interband scattering [3] suppresses the multigap superconductivity. From the experimental investigation of the nanoscale heterogeneous striped phase of the CuO 2 plane in cuprate high T c perovskites [4,5] it was proposed that the 2D Fermi surface of superconducting plane is broken by the lattice heterogeneity into Fermi surface arcs associated with different subbands.…”

Section: Introductionmentioning

confidence: 99%

Anomalous Thermal Expansion in Superconducting Mg1− x Al x B2 System

et al. 2005

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“…The multiband superconductivity shows up only in the "clean limit", where the single electron mean free path for the interband impurity scattering satisfies the condition l > nv F ∆ av where v F is the Fermi velocity and ∆ av is the average superconducting gap [24,28,35]. This is a very strict condition therefore most of the metals are in the "dirty limit" where the interband impurity scattering mixes the electron wave functions of electrons on different spots on Fermi surfaces and it reduces the system to an effective single Fermi surface for the pairing interaction.…”

Section: Introductionmentioning

confidence: 99%

Feshbach Shape Resonance in Multiband Superconductivity in Heterostructures

Bianconi¹

2005

J Supercond

117

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We report experimental data showing the Feshbach shape resonance in the electron Van Hove-Lifshits feature for the change of Fermi surface dimensionality in the electronic energy spectrum in one of the subbands. In this heterostructure at atomic limit the multiband superconductivity is in the clean limit because the disparity and negligible overlap between electron wavefunctions in different subbands suppresses the single electron interband impurity scattering rate. The emerging scenario from these 2 experimental data suggests that the Feshbach shape resonance could be the mechanism for high T c in particular nanostructured architectures.

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Kinetic Phenomena in Superconductors

Cited by 41 publications

References 2 publications

Electronic collective modes and superconductivity in layered conductors

Electronic collective modes and superconductivity in layered conductors

Anomalous Thermal Expansion in Superconducting Mg1− x Al x B2 System

Feshbach Shape Resonance in Multiband Superconductivity in Heterostructures

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