Bulk superconductivity and fully gapped superconducting state in Ba-doped phenanthrene
Yuichi Kasahara, Yuki Takeuchi, Yoshihiro Iwasa
DOI 10.1103/PhysRevB.85.214520 · Physical Review B
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Abstract
The superconducting state of Ba-intercalated phenanthrene, Ba1.5phenanthrene, has been investigated by specific-heat measurements down to 0.4 K. A clear anomaly associated with the superconducting transition at Tc=4.7 K indicates the bulk nature of the superconductivity. The temperature and the magnetic-field dependence of the electronic specific heat are consistent with a fully gapped superconducting order parameter. The electron-phonon coupling constant estimated from the specific-heat jump is 0.55 to 1.06, suggesting that the superconductivity of Ba1.5phenanthrene can be explained within the BCS approach with intermediate coupling mediated by phonons of approximately 100 cm−1 in frequency, which is assigned as intercalant phonons or intermolecular phonon modes.
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