TY - JOUR

T1 - 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

AU - Ohashi, Y.

AU - Takada, S.

PY - 1999

Y1 - 1999

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 (Formula presented) as observed in high-(Formula presented) cuprates (Formula presented) 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 (Formula presented) 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 (Formula presented) and the structure function of the pair field susceptibility (Formula presented) The peak in (Formula presented) is located at a finite energy at (Formula presented) corresponding to the low-frequency plasma, while the CG mode with a linear dispersion is found in (Formula presented)

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 (Formula presented) as observed in high-(Formula presented) cuprates (Formula presented) 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 (Formula presented) 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 (Formula presented) and the structure function of the pair field susceptibility (Formula presented) The peak in (Formula presented) is located at a finite energy at (Formula presented) corresponding to the low-frequency plasma, while the CG mode with a linear dispersion is found in (Formula presented)

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U2 - 10.1103/PhysRevB.59.4404

DO - 10.1103/PhysRevB.59.4404

M3 - Article

AN - SCOPUS:0001188340

SN - 1098-0121

VL - 59

SP - 4404

EP - 4411

JO - Physical Review B - Condensed Matter and Materials Physics

JF - Physical Review B - Condensed Matter and Materials Physics

IS - 6

ER -