کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7988141 | 1515612 | 2014 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Thermodynamics of the superconducting phase in compressed GeH4(H2)2
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
دانش مواد (عمومی)
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Recent studies on the hydrogen-rich metals are mainly stimulated by the fact that these superconductors are supposed to exhibit the high value of the critical temperature (TC). The thermodynamic properties of GeH4(H2)2 hydride under the pressure at 250 GPa have been studied in the present paper. The calculations have been conducted in the framework of the Eliashberg approach for the wide range of the Coulomb pseudopotential values: μââã0.1,0.3ã. It has been found that the critical temperature is high in the entire range of the Coulomb pseudopotential: TCâã128.5,69.8ãK. The values of the thermodynamic dimensionless ratios, namely RÎâ¡2Î(0)/kBTC, RCâ¡ÎC(TC)/CN(TC), and RHâ¡TCCN(TC)/HC2(0), differ from the predictions of the Bardeen-Cooper-Schrieffer theory. In particular, RÎâã4.30,4.08ã, RCâã1.91,1.58ã, and RHâã0.151,0.154ã. Finally, the ratio of the electron effective mass (meâ) to the electron band mass (me) reaches the maximum at the critical temperature, where meâ/me=2.45.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Solid State Communications - Volume 184, April 2014, Pages 6-11
Journal: Solid State Communications - Volume 184, April 2014, Pages 6-11
نویسندگان
R. Szcze¸Åniak, D. Szcze¸Åniak, A.P. Durajski,