On the Ratio of the Energy Gap Amplitude to the Critical Temperature for Cuprates |

R. Szczęśniak and A.P. Durajski
Institute of Physics, Częstochowa University of Technology, al. Armii Krajowej 19, 42-200 Częstochowa, Poland |

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The model for the cuprates based on the modified electron-phonon pairing mechanism has been tested. For this purpose, the superconductors with high value of the critical temperature have been taken into consideration. In particular: YBa_{2}Cu_{3}O_{7-y}, HgBa_{2}CuO_{4+y}, HgBa_{2}Cu_{1-x}Zn_{x}O_{4+y}, and HgBa_{2}Ca_{2}Cu_{3}O_{8+y}. It has been shown that the dependence of the ratio R_{1} ≡ 2Δ_{tot}^{(0)}/k_{B}T_{C} on the doping (p) can be properly predicted in the framework of the presented theory; the symbol Δ_{tot}^{(0)} denotes the energy gap amplitude at the temperature of zero kelvin, and T_{C} is the critical temperature. The numerical results have been supplemented by the formula which describes the function R_{1}(p). |

DOI: 10.12693/APhysPolA.126.A-92 PACS numbers: 74.20.-z, 74.20.Fg, 74.20.Mn, 74.25.Bt, 74.72.-h, 74.72.Bk, 74.72.Jt |