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

G. I. González-Pedreros; J. A. Camargo-Martínez; F. Mesa

doi:10.1038/s41598-021-87028-x

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

G. I. González-Pedreros, J. A. Camargo-Martínez, F. Mesa

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Resumen

In this paper, we report Cooper Pairs Distribution function D_cp(ω, T_c) for bcc Niobium under pressure. This function reveals information about the superconductor state through the determination of the spectral regions for Cooper-pairs formation. D_cp(ω, T_c) is built from the well-established Eliashberg spectral function and phonon density of states, calculated by first-principles. D_cp(ω, T_c) for Nb suggests that the low-frequency vibration region (ω<6meV) is where Cooper-pairs are possible. From D_cp(ω, T_c) , it is possible to obtain the N_cp parameter, which is proportional to the total number of Cooper-Pairs formed at a temperature T_c. The N_cp parameter allows an approach to the understanding of the Nb T_c anomalies, measured around 5 and 50 GPa.

Idioma original	Inglés estadounidense
Número de artículo	7646
Publicación	Scientific Reports
Volumen	11
N.º	1
DOI	https://doi.org/10.1038/s41598-021-87028-x
Estado	Publicada - dic. 2021

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abstract = "In this paper, we report Cooper Pairs Distribution function Dcp(ω, 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(ω, Tc) is built from the well-established Eliashberg spectral function and phonon density of states, calculated by first-principles. Dcp(ω, Tc) for Nb suggests that the low-frequency vibration region (ω<6meV) is where Cooper-pairs are possible. From Dcp(ω, 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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N2 - In this paper, we report Cooper Pairs Distribution function Dcp(ω, 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(ω, Tc) is built from the well-established Eliashberg spectral function and phonon density of states, calculated by first-principles. Dcp(ω, Tc) for Nb suggests that the low-frequency vibration region (ω<6meV) is where Cooper-pairs are possible. From Dcp(ω, 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.

AB - In this paper, we report Cooper Pairs Distribution function Dcp(ω, 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(ω, Tc) is built from the well-established Eliashberg spectral function and phonon density of states, calculated by first-principles. Dcp(ω, Tc) for Nb suggests that the low-frequency vibration region (ω<6meV) is where Cooper-pairs are possible. From Dcp(ω, 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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Cooper Pairs Distribution function for bcc Niobium under pressure from first-principles

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