Temperature-dependent localized excitations of doped carriers in superconducting diamond |
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Authors: | Ishizaka K Eguchi R Tsuda S Chainani A Yokoya T Kiss T Shimojima T Togashi T Watanabe S Chen C-T Takano Y Nagao M Sakaguchi I Takenouchi T Kawarada H Shin S |
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Affiliation: | Institute for Solid State Physics, University of Tokyo, Kashiwa, Chiba 277-8581, Japan. |
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Abstract: | Laser-excited photoemission spectroscopy is used to show that the doped carriers in metallic or superconducting diamond couple strongly to the lattice via high-energy (approximately 150 meV) optical phonons, with direct observations of localized Franck-Condon multiphonon sidebands appearing as Fermi-edge replicas. It exhibits a temperature-dependent spectral weight transfer from higher to lower energy sidebands and zero-phonon Fermi-edge states. The quantified coupling strength shows a systematic increase on lowering temperature, implicating its relation to the normal state transport and superconductivity. |
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