### Abstract

Eliashberg formalism is used to investigate the thermodynamic properties of the high-pressure superconducting phase of the CaLi_{2} compound. In particular, our calculations are conducted in the vicinity of the C2/c → P2_{1/c} pressure-induced structural phase transition. We show that, in the considered case, the value of the Coulomb pseudopotential is high and equals 0.26. Moreover, we give the analysis of the thermodynamic parameters such as the superconducting transition temperature (T_{C}), the energy gap at the Fermi level (2Δ(0)), the thermodynamic critical field (H_{C}), and the specific heat of superconducting (C^{S}) and normal (C ^{N}) states. We emphasize that the characteristic dimensionless ratios RΔ ≡ 2Δ(0)/k_{B}T_{C}, R_{H} ≡ T_{C}C^{N}(T_{C})/H_{C}
^{2}(0), and R_{C} ≡ ΔC(T_{C})/C^{N} (T_{C}), have values that are beyond the predictions of the BCS theory in the case of the considered material. In particular, RΔ = 3.85, R_{H} = 0.161, and R_{C} = 1.86. Furthermore, it is proved that the effective electron mass is high and equals 2.02m_{e}, where m_{e} denotes the bare electron mass.

Original language | English |
---|---|

Article number | 087401 |

Journal | Chinese Physics Letters |

Volume | 31 |

Issue number | 8 |

DOIs | |

Publication status | Published - 1 Aug 2014 |

Externally published | Yes |

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### ASJC Scopus subject areas

- Physics and Astronomy(all)

### Cite this

_{2}superconductor in the vicinity of structural phase transition.

*Chinese Physics Letters*,

*31*(8), [087401]. https://doi.org/10.1088/0256-307X/31/8/087401

**Thermodynamics of the CaLi _{2} superconductor in the vicinity of structural phase transition.** / Szczśniak, D.; Szczśniak, R.

Research output: Contribution to journal › Article

_{2}superconductor in the vicinity of structural phase transition',

*Chinese Physics Letters*, vol. 31, no. 8, 087401. https://doi.org/10.1088/0256-307X/31/8/087401

_{2}superconductor in the vicinity of structural phase transition. Chinese Physics Letters. 2014 Aug 1;31(8). 087401. https://doi.org/10.1088/0256-307X/31/8/087401

}

TY - JOUR

T1 - Thermodynamics of the CaLi2 superconductor in the vicinity of structural phase transition

AU - Szczśniak, D.

AU - Szczśniak, R.

PY - 2014/8/1

Y1 - 2014/8/1

N2 - Eliashberg formalism is used to investigate the thermodynamic properties of the high-pressure superconducting phase of the CaLi2 compound. In particular, our calculations are conducted in the vicinity of the C2/c → P21/c pressure-induced structural phase transition. We show that, in the considered case, the value of the Coulomb pseudopotential is high and equals 0.26. Moreover, we give the analysis of the thermodynamic parameters such as the superconducting transition temperature (TC), the energy gap at the Fermi level (2Δ(0)), the thermodynamic critical field (HC), and the specific heat of superconducting (CS) and normal (C N) states. We emphasize that the characteristic dimensionless ratios RΔ ≡ 2Δ(0)/kBTC, RH ≡ TCCN(TC)/HC 2(0), and RC ≡ ΔC(TC)/CN (TC), have values that are beyond the predictions of the BCS theory in the case of the considered material. In particular, RΔ = 3.85, RH = 0.161, and RC = 1.86. Furthermore, it is proved that the effective electron mass is high and equals 2.02me, where me denotes the bare electron mass.

AB - Eliashberg formalism is used to investigate the thermodynamic properties of the high-pressure superconducting phase of the CaLi2 compound. In particular, our calculations are conducted in the vicinity of the C2/c → P21/c pressure-induced structural phase transition. We show that, in the considered case, the value of the Coulomb pseudopotential is high and equals 0.26. Moreover, we give the analysis of the thermodynamic parameters such as the superconducting transition temperature (TC), the energy gap at the Fermi level (2Δ(0)), the thermodynamic critical field (HC), and the specific heat of superconducting (CS) and normal (C N) states. We emphasize that the characteristic dimensionless ratios RΔ ≡ 2Δ(0)/kBTC, RH ≡ TCCN(TC)/HC 2(0), and RC ≡ ΔC(TC)/CN (TC), have values that are beyond the predictions of the BCS theory in the case of the considered material. In particular, RΔ = 3.85, RH = 0.161, and RC = 1.86. Furthermore, it is proved that the effective electron mass is high and equals 2.02me, where me denotes the bare electron mass.

UR - http://www.scopus.com/inward/record.url?scp=84905845314&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84905845314&partnerID=8YFLogxK

U2 - 10.1088/0256-307X/31/8/087401

DO - 10.1088/0256-307X/31/8/087401

M3 - Article

AN - SCOPUS:84905845314

VL - 31

JO - Chinese Physics Letters

JF - Chinese Physics Letters

SN - 0256-307X

IS - 8

M1 - 087401

ER -