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arxiv cond-mat/0607012 v1 pith:7VYL5LXQ submitted 2006-07-01 cond-mat.supr-con

Robustness of s-wave superconductivity against Coulomb interactions in Na_xCoO₂

Keiji Yada , Hiroshi Kontani This is my paper
classification cond-mat.supr-con
keywords coulombinteractionsmechanismphononssuperconductivitybreathingconsiders-wave
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We study the depairing effect due to Coulomb interactions in Na$_x$CoO$_2$. We consider the electron-phonon coupling and the Coulomb interactions, and determine $T_c$ for s-wave superconductivity by solving the linearized Eliashberg equation. When we consider shear phonons as well as breathing phonons, $T_c$ is enhanced by Suhl-Kondo (SK) mechanism. Since SK mechanism is strong against Coulomb interactions, $T_c$ remains finite even if strong Coulomb interactions cancel out the attractive force due to breathing phonons. The orbital degree of freedom is important to understand the mechanism of superconductivity in Na$_x$CoO$_2$.

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