Cooper-pair formation by anharmonic rattling modes in the β-pyrochlore superconductor KOs2O6

Details Cooper-pair formation by anharmonic rattling modes in the β-pyrochlore superconductor KOs2O6 Cooper-pair formation by anharmonic rattling modes in the β-pyrochlore superconductor KOs2O6

May 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009njph...11e5068c&link_type=abstract

New Journal of Physics, Volume 11, Issue 5, pp. 055068 (2009).

Physics

9

Scientific paper

We study the influence of anharmonic rattling phonons in the β-pyrochlore superconductor KOs2O6 using the strong-coupling Eliashberg approach. In particular, by analyzing the specific heat data, we find that the rattling phonon frequency changes discontinuously at the critical temperature of the first-order phase transition. Solving the strong-coupling Eliashberg equations with effective temperature-dependent α2F(ω), we investigate the consequence of this first-order phase transition for the anomalous temperature dependence of the superconducting gap. We discuss our results in the context of the recent experimental data.

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