Temperature dependence of c-axis Josephson plasma oscillation in high-Tc superconductors

Yoji Ohashi, S. Takada

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

We present a microscopic theory for the c-axis transverse Josephson plasma oscillation in quasi-two-dimensional d-wave superconductors. In our model, the incoherent motion of electrons along the c axis are introduced by potential scattering with arbitrary scattering strength, and their depairing effect on superconductivity is determined self-consistently. We show that the plasma frequency decreases with increasing temperature in the presence of the scattering. In particular, when the scattering strength exceeds a critical value, it vanishes at the transition temperature Tc as is observed in Bi2Sr2CaCu2O8. In this case, when the scattering is in the Born limit, the V-shaped superconducting density of states (DOS) can be obtained in spite of the impure system. This result can explain why the V-shaped DOS is observed in this material by tunneling experiment although the temperature-dependent plasma indicates the presence of a scattering. Our model also produces a good fit to experimental data on Tl2Ba2CuO6. From the fit, we find that both the superfluid and the normal electrons contribute to the plasma oscillation in this material. This feature is different from the ordinary Josephson plasma, which is the oscillation of only the superfluid component.

Original languageEnglish
Pages (from-to)4276-4288
Number of pages13
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume61
Issue number6
Publication statusPublished - 2000 Feb 1
Externally publishedYes

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Plasma oscillations
plasma oscillations
Superconducting materials
Scattering
temperature dependence
scattering
Plasmas
Temperature
Electrons
plasma frequencies
Superconductivity
Superconducting transition temperature
electrons
superconductivity
transition temperature
oscillations
temperature

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

Temperature dependence of c-axis Josephson plasma oscillation in high-Tc superconductors. / Ohashi, Yoji; Takada, S.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 61, No. 6, 01.02.2000, p. 4276-4288.

Research output: Contribution to journalArticle

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