### 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 |
---|---|

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

**Energy gap and electron effective mass in chlorine halide superconductor at high pressure.** / Szczesniak, R.; Szczesniak, D.

Research output: Contribution to journal › Article

*Chinese Physics Letters*, vol. 31, no. 11, 117401. https://doi.org/10.1088/0256-307X/31/11/117401

}

TY - JOUR

T1 - Energy gap and electron effective mass in chlorine halide superconductor at high pressure

AU - Szczesniak, R.

AU - Szczesniak, D.

PY - 2014/11/1

Y1 - 2014/11/1

N2 - Dependences of the order parameter (Δ) and the electron effective mass (me ∗) on the temperature for the chlorine halide superconductor are determined in the present work. The high values of the pressure (p1 = 320 GPa andp2 = 360 GPa), for which the critical temperature is equal to [TC]p1 = 30.6 K and [TC]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)]p1 = 4.89 meV and [Δ(0)]p2 = 6.82 meV. The obtained results allowed next to calculate the dimensionless ratio RΔ ≡ 2Δ(0)/kBTC, which is equal to 3.71 and 3.81 in respect to p1 and p2. 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 [me ∗]max p1 = 1.69me and [me ∗]max p2 = 1.78me, where the symbol me denotes the electron band mass.

AB - Dependences of the order parameter (Δ) and the electron effective mass (me ∗) on the temperature for the chlorine halide superconductor are determined in the present work. The high values of the pressure (p1 = 320 GPa andp2 = 360 GPa), for which the critical temperature is equal to [TC]p1 = 30.6 K and [TC]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)]p1 = 4.89 meV and [Δ(0)]p2 = 6.82 meV. The obtained results allowed next to calculate the dimensionless ratio RΔ ≡ 2Δ(0)/kBTC, which is equal to 3.71 and 3.81 in respect to p1 and p2. 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 [me ∗]max p1 = 1.69me and [me ∗]max p2 = 1.78me, where the symbol me denotes the electron band mass.

UR - http://www.scopus.com/inward/record.url?scp=84924678724&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84924678724&partnerID=8YFLogxK

U2 - 10.1088/0256-307X/31/11/117401

DO - 10.1088/0256-307X/31/11/117401

M3 - Article

VL - 31

JO - Chinese Physics Letters

JF - Chinese Physics Letters

SN - 0256-307X

IS - 11

M1 - 117401

ER -