Cooper Pairs Distribution function for bcc Niobium under pressure from first-principles

被引：5
|
作者：
Gonzalez-Pedreros, G., I [1 ]
Camargo-Martinez, J. A. [2 ]
Mesa, F. [1 ]
机构：
[1] Univ Rosario, Fac Nat Sci, Carrera 24 63C-69, Bogota 111221, DC, Colombia
[2] Unitropico, Grp Invest Ciencias Basicas Aplicac & Innovat CIB, Yopal, Colombia
来源：
SCIENTIFIC REPORTS | 2021年 / 11卷 / 01期
关键词：
POSITRON-ANNIHILATION RADIATION; ELECTRONIC-STRUCTURE; FERMI-SURFACE; ANGULAR-DISTRIBUTION; TRANSITION-METALS; LINEAR-RESPONSE; NB; TEMPERATURE; VANADIUM;
D O I：
10.1038/s41598-021-87028-x
中图分类号：
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号：
07 ; 0710 ; 09 ;
摘要：
In this paper, we report Cooper Pairs Distribution function Dcp(omega,Tc) for bcc Niobium under pressure. This function reveals information about the superconductor state through the determination of the spectral regions for Cooper-pairs formation. Dcp(omega,Tc) is built from the well-established Eliashberg spectral function and phonon density of states, calculated by first-principles. Dcp(omega,Tc) for Nb suggests that the low-frequency vibration region is where Cooper-pairs are possible. From Dcp(omega,Tc), it is possible to obtain the Ncp parameter, which is proportional to the total number of Cooper-Pairs formed at a temperature Tc. The Ncp parameter allows an approach to the understanding of the Nb Tc anomalies, measured around 5 and 50 GPa.
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页数：6
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