Theoretical studies on the observation of the low-frequency plasma oscillation and its coupling with the Carlson-Goldman mode in dirty quasi-two-dimensional superconductors

Yoji Ohashi, S. Takada

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15 Citations (Scopus)

Abstract

The plasma oscillation in a superconductor is investigated for the case when the plasma energy is smaller than the superconducting gap. We show that the plasma energy has a temperature dependence in dirty superconductors. When the strength of the impurity scattering exceeds a critical value, the plasma disappears at the transition temperature TC as observed in high-TC cuprates (Bi2Sr2CaCu2O8+δ). We also study the coupling of the plasma with the Carlson-Goldman (CG) mode in a dirty superconductor. A pole analysis show that the coupling occurs just below TC. However, even in this situation, we find that two different modelike peak structures can be still observed in the spectra of the density-density correlation function [II33(q, ω)] and the structure function of the pair field susceptibility [S(q, ω)]: The peak in II33 is located at a finite energy at q ∼0 corresponding to the low-frequency plasma, while the CG mode with a linear dispersion is found in S(q, ω).

Original languageEnglish
Pages (from-to)4404-4411
Number of pages8
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume59
Issue number6
Publication statusPublished - 1999
Externally publishedYes

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Plasma oscillations
plasma oscillations
Superconducting materials
low frequencies
Plasmas
cuprates
Superconducting transition temperature
energy
Poles
poles
transition temperature
Scattering
Impurities
magnetic permeability
impurities
temperature dependence
scattering

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

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abstract = "The plasma oscillation in a superconductor is investigated for the case when the plasma energy is smaller than the superconducting gap. We show that the plasma energy has a temperature dependence in dirty superconductors. When the strength of the impurity scattering exceeds a critical value, the plasma disappears at the transition temperature TC as observed in high-TC cuprates (Bi2Sr2CaCu2O8+δ). We also study the coupling of the plasma with the Carlson-Goldman (CG) mode in a dirty superconductor. A pole analysis show that the coupling occurs just below TC. However, even in this situation, we find that two different modelike peak structures can be still observed in the spectra of the density-density correlation function [II33(q, ω)] and the structure function of the pair field susceptibility [S(q, ω)]: The peak in II33 is located at a finite energy at q ∼0 corresponding to the low-frequency plasma, while the CG mode with a linear dispersion is found in S(q, ω).",
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AU - Takada, S.

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N2 - The plasma oscillation in a superconductor is investigated for the case when the plasma energy is smaller than the superconducting gap. We show that the plasma energy has a temperature dependence in dirty superconductors. When the strength of the impurity scattering exceeds a critical value, the plasma disappears at the transition temperature TC as observed in high-TC cuprates (Bi2Sr2CaCu2O8+δ). We also study the coupling of the plasma with the Carlson-Goldman (CG) mode in a dirty superconductor. A pole analysis show that the coupling occurs just below TC. However, even in this situation, we find that two different modelike peak structures can be still observed in the spectra of the density-density correlation function [II33(q, ω)] and the structure function of the pair field susceptibility [S(q, ω)]: The peak in II33 is located at a finite energy at q ∼0 corresponding to the low-frequency plasma, while the CG mode with a linear dispersion is found in S(q, ω).

AB - The plasma oscillation in a superconductor is investigated for the case when the plasma energy is smaller than the superconducting gap. We show that the plasma energy has a temperature dependence in dirty superconductors. When the strength of the impurity scattering exceeds a critical value, the plasma disappears at the transition temperature TC as observed in high-TC cuprates (Bi2Sr2CaCu2O8+δ). We also study the coupling of the plasma with the Carlson-Goldman (CG) mode in a dirty superconductor. A pole analysis show that the coupling occurs just below TC. However, even in this situation, we find that two different modelike peak structures can be still observed in the spectra of the density-density correlation function [II33(q, ω)] and the structure function of the pair field susceptibility [S(q, ω)]: The peak in II33 is located at a finite energy at q ∼0 corresponding to the low-frequency plasma, while the CG mode with a linear dispersion is found in S(q, ω).

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