کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1592278 | 1515630 | 2013 | 6 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Study of the superconducting state in the Cmmm phase of GeH4 compound Study of the superconducting state in the Cmmm phase of GeH4 compound](/preview/png/1592278.png)
The superconducting state, that gets induced in the GeH4 compound under the pressure at 20 GPa, is characterized by the high critical temperature TC(μ⋆)∈〈54.5,31.2〉TC(μ⋆)∈〈54.5,31.2〉 K, where μ⋆μ⋆ is the Coulomb pseudopotential, and μ⋆∈〈0.1,0.3〉μ⋆∈〈0.1,0.3〉. Other thermodynamic parameters for the considered range of the Coulomb pseudopotential significantly differ from the predictions of the BCS model. In particular: (i) the ratio of the energy gap to the critical temperature (RΔ≡2Δ(0)/kBTCRΔ≡2Δ(0)/kBTC) changes from 4.07 to 3.88; (ii) the value of the parameter RC≡ΔC(TC)/CN(TC)RC≡ΔC(TC)/CN(TC) decreases from 1.85 to 1.69, where ΔCΔC denotes the specific heat jump, and CN is the specific heat of the normal state; (iii) the ratio RH≡TCCN(TC)/HC2(0) increases from 0.147 to 0.155; HC represents the thermodynamic critical field.
• Thermodynamic parameters of the superconducting state that induces in GeH4 under the pressure at 20 GPa.
• The high critical temperature.
• The non-BCS value of the ratio 2Δ/kBTC2Δ/kBTC.
• The large electron effective mass.
Journal: Solid State Communications - Volume 165, July 2013, Pages 39–44