Abstract
Abstract A realistic anisitropic phonon frequency distribution function for superconducting lanthanum cuprates, which takes account of (i) the presence of planar modes, (ii) is quite close to the experimental phonon frequency distribution function and (iii) yields the specific heat values in the temperature range 5 to 50 K in reasonable agreement with the various measured values, has been used to calculate the superconducting critical temperature, T c , making use of the expression based on the strongly coupled theory of superconductivity and other realistic parameters. The calculated value of T c ≅34.8 K is in reasonable agreement with the observed results. The effect of thermal phonons and two-dimensional acoustic plasmons has been studied (when both electron-phonon and electron-plasmon mechanisms are present) which results in an increase of ~3 K and ~9 K, respectively. Finally the variation of T c with the change of phonon anisotropy has been reported and it is found that the T c is noticeably dependent on the degree of phonon anisotropy. A significant result is that for superconductivity to occur in these compounds, coupling between the Cu-O planes is essential.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
