Superconductivity in β-tin germanium

Chao Zhang; Xiao Jia Chen; Hai Qing Lin

doi:10.1007/s10948-012-1921-6

Superconductivity in β-tin germanium

Chao Zhang
, Xiao Jia Chen
, Hai Qing Lin^*

^*Corresponding author for this work

China Academy of Engineering Physics
South China University of Technology

Research output: Contribution to journal › Article › peer-review

Abstract

The superconducting properties of the β-tin germanium under pressure have been investigated by the firstprinciples calculations based on density functional perturbation theory. The electron–phonon coupling strength as a function of pressure was calculated, and it deceases with the application of pressure. Using the calculated electron– phonon coupling strength, the superconducting transition temperature T_c has been estimated. Assuming a nominal Coulomb repulsion parameter of 0.1, the calculated T_c is in excellent agreement with experimental data. The T_c correlates with electron–phonon coupling strength, indicating phonon-mediated superconductivity in β-tin Ge phase. Our findings have great implications to other Group IVa elements.

Original language	English
Pages (from-to)	2009-2011
Number of pages	3
Journal	Journal of Superconductivity and Novel Magnetism
Volume	26
Issue number	5
DOIs	https://doi.org/10.1007/s10948-012-1921-6
State	Published - May 2013
Externally published	Yes

Keywords

Electron–phonon coupling
First-principles calculations
Germanium
Pressure effect

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10.1007/s10948-012-1921-6

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title = "Superconductivity in β-tin germanium",

abstract = "The superconducting properties of the β-tin germanium under pressure have been investigated by the firstprinciples calculations based on density functional perturbation theory. The electron–phonon coupling strength as a function of pressure was calculated, and it deceases with the application of pressure. Using the calculated electron– phonon coupling strength, the superconducting transition temperature Tc has been estimated. Assuming a nominal Coulomb repulsion parameter of 0.1, the calculated Tc is in excellent agreement with experimental data. The Tc correlates with electron–phonon coupling strength, indicating phonon-mediated superconductivity in β-tin Ge phase. Our findings have great implications to other Group IVa elements.",

keywords = "Electron–phonon coupling, First-principles calculations, Germanium, Pressure effect",

author = "Chao Zhang and Chen, \{Xiao Jia\} and Lin, \{Hai Qing\}",

note = "Publisher Copyright: {\textcopyright} Springer Science+Business Media New York 2012.",

year = "2013",

month = may,

doi = "10.1007/s10948-012-1921-6",

language = "英语",

volume = "26",

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TY - JOUR

T1 - Superconductivity in β-tin germanium

AU - Zhang, Chao

AU - Chen, Xiao Jia

AU - Lin, Hai Qing

N1 - Publisher Copyright: © Springer Science+Business Media New York 2012.

PY - 2013/5

Y1 - 2013/5

N2 - The superconducting properties of the β-tin germanium under pressure have been investigated by the firstprinciples calculations based on density functional perturbation theory. The electron–phonon coupling strength as a function of pressure was calculated, and it deceases with the application of pressure. Using the calculated electron– phonon coupling strength, the superconducting transition temperature Tc has been estimated. Assuming a nominal Coulomb repulsion parameter of 0.1, the calculated Tc is in excellent agreement with experimental data. The Tc correlates with electron–phonon coupling strength, indicating phonon-mediated superconductivity in β-tin Ge phase. Our findings have great implications to other Group IVa elements.

AB - The superconducting properties of the β-tin germanium under pressure have been investigated by the firstprinciples calculations based on density functional perturbation theory. The electron–phonon coupling strength as a function of pressure was calculated, and it deceases with the application of pressure. Using the calculated electron– phonon coupling strength, the superconducting transition temperature Tc has been estimated. Assuming a nominal Coulomb repulsion parameter of 0.1, the calculated Tc is in excellent agreement with experimental data. The Tc correlates with electron–phonon coupling strength, indicating phonon-mediated superconductivity in β-tin Ge phase. Our findings have great implications to other Group IVa elements.

KW - Electron–phonon coupling

KW - First-principles calculations

KW - Germanium

KW - Pressure effect

UR - https://www.scopus.com/pages/publications/84959250019

U2 - 10.1007/s10948-012-1921-6

DO - 10.1007/s10948-012-1921-6

M3 - 文章

AN - SCOPUS:84959250019

SN - 1557-1939

VL - 26

SP - 2009

EP - 2011

JO - Journal of Superconductivity and Novel Magnetism

JF - Journal of Superconductivity and Novel Magnetism

IS - 5

ER -

Superconductivity in β-tin germanium

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Keywords

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