### Abstract

Dependences of the order parameter (Δ) and the electron effective mass (m_{e}
^{∗}) on the temperature for the chlorine halide superconductor are determined in the present work. The high values of the pressure (p_{1} = 320 GPa andp_{2} = 360 GPa), for which the critical temperature is equal to [T_{C}]p1 = 30.6 K and [T_{C}]p2 = 41.5 K, are taken into consideration. It is found that the dependence of the order parameter on the temperature deviates from the predictions of the classical Bardeen - Cooper - Schrieffer theory, due to the existence of the significant strong-coupling and retardation effects. The values of the order parameter, for the temperature close to zero Kelvin, are equal to [Δ(0)]_{p}1 = 4.89 meV and [Δ(0)]_{p}2 = 6.82 meV. The obtained results allowed next to calculate the dimensionless ratio R_{Δ} ≡ 2Δ(0)/k_{BT}C, which is equal to 3.71 and 3.81 in respect to p_{1} and p_{2}. In the last step, it is proven that the electron effective mass is weakly dependent on the temperature in the area of the existence of the superconducting state and reaches its maximum at the critical temperature. For the considered values of the pressure, we obtain [m_{e}
^{∗}]^{max}
_{p}1 = 1.69m_{e} and [m_{e}
^{∗}]^{max}
_{p}2 = 1.78m_{e}, where the symbol m_{e} denotes the electron band mass.

Original language | English |
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Article number | 117401 |

Journal | Chinese Physics Letters |

Volume | 31 |

Issue number | 11 |

DOIs | |

Publication status | Published - 1 Nov 2014 |

Externally published | Yes |

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### ASJC Scopus subject areas

- Physics and Astronomy(all)

### Cite this

*Chinese Physics Letters*,

*31*(11), [117401]. https://doi.org/10.1088/0256-307X/31/11/117401