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Boris V. Vasiliev Supercondustivity Superfluidity

Superconductivity and

Superconductivity and Superfluidity temperature of a superconductor with the experimentally measurable parameter: with its electronic specific heat. Taking into account Eq.(6.20), we have: where the constant Θ ≃ 31 π2 k ∆ 0 ≃ Θγ 2 , (7.3) [ ] α 2 3 ≃ 6.65 · 10 −22 K4 cm 6 . (7.4) km e erg Table 7.1 The comparison of the calculated values of superconductors critical temperatures with measured Fermi temperatures. superconductor T c,K T F ,K Eq(7.2) T c T F Cd 0.51 1.81 · 10 5 2.86 · 10 −6 Zn 0.85 3.30 · 10 5 2.58 · 10 −6 Ga 1.09 1.65 · 10 5 6.65 · 10 −6 Tl 2.39 4.67 · 10 5 5.09 · 10 −6 In 3.41 7.22 · 10 5 4.72 · 10 −6 Sn 3.72 7.33 · 10 5 5.08 · 10 −6 Hg 4.15 1.05 · 10 6 3.96 · 10 −6 Pb 7.19 1.85 · 10 6 3.90 · 10 −6 76 Science Publishing Group

Chapter 7 The Condensate of Zero-Point Oscillations and Type-I Superconductors Table 7.2 The comparison of the calculated values of superconductors critical temperatures with measurement data. superconductors T c(measur), K γ, erg cm 3 K 2 T c(calc), K Eq.(7.3) T c(calc) T c(meas) Cd 0.517 532 0.77 1.49 Zn 0.85 718 1.41 1.65 Ga 1.09 508 0.70 0.65 Tl 2.39 855 1.99 0.84 In 3.41 1062 3.08 0.90 Sn 3.72 1070 3.12 0.84 Hg 4.15 1280 4.48 1.07 Pb 7.19 1699 7.88 1.09 1.0 log T c Pb 0.5 Tl Sn Hg In 0.0 Ga Zn Cd log T F -0.5 5.0 5.5 6.0 6.5 Figure 7.1 The comparison of critical temperatures T c of type-I superconductors with their Fermi temperatures T F . The straight line is obtained from Eq.(6.20). Science Publishing Group 77

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