Influence of hydrogen on electron-phonon coupling and intrinsic electrical resistivity in zirconium

A first-principles study

Research output: Contribution to journalArticle

Abstract

This paper presents the first-principles calculation of the electron-phonon coupling and the temperature dependence of the intrinsic electrical resistivity of the zirconium-hydrogen system with various hydrogen concentrations. The nature of the anomalous decrease in the electrical resistivity of the Zr-H system with the increase of hydrogen concentration (at high concentrations of H/Zr>1.5) is studied. It is found that the hydrogen concentration where the resistivity starts to decrease is very close to the critical concentration of the δ-ϵ phase transition. It is shown that the tetragonal lattice distortion due to the δ-ϵ phase transition of the Zr-H system eliminates imaginary phonon frequencies and the strong electron-phonon coupling of the δ phase and, as a result, leads to the reduction of the electrical resistivity of the Zr-H system at a high hydrogen concentration.

Original languageEnglish
Article number205152
JournalPhysical Review B
Volume99
Issue number20
DOIs
Publication statusPublished - 28 May 2019

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Zirconium
Hydrogen
electrical resistivity
Electrons
hydrogen
electrons
Phase transitions
temperature dependence
Temperature

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

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title = "Influence of hydrogen on electron-phonon coupling and intrinsic electrical resistivity in zirconium: A first-principles study",
abstract = "This paper presents the first-principles calculation of the electron-phonon coupling and the temperature dependence of the intrinsic electrical resistivity of the zirconium-hydrogen system with various hydrogen concentrations. The nature of the anomalous decrease in the electrical resistivity of the Zr-H system with the increase of hydrogen concentration (at high concentrations of H/Zr>1.5) is studied. It is found that the hydrogen concentration where the resistivity starts to decrease is very close to the critical concentration of the δ-ϵ phase transition. It is shown that the tetragonal lattice distortion due to the δ-ϵ phase transition of the Zr-H system eliminates imaginary phonon frequencies and the strong electron-phonon coupling of the δ phase and, as a result, leads to the reduction of the electrical resistivity of the Zr-H system at a high hydrogen concentration.",
author = "Qicheng Tang and Svyatkin, {L. A.} and Chernov, {I. P.}",
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language = "English",
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AU - Tang, Qicheng

AU - Svyatkin, L. A.

AU - Chernov, I. P.

PY - 2019/5/28

Y1 - 2019/5/28

N2 - This paper presents the first-principles calculation of the electron-phonon coupling and the temperature dependence of the intrinsic electrical resistivity of the zirconium-hydrogen system with various hydrogen concentrations. The nature of the anomalous decrease in the electrical resistivity of the Zr-H system with the increase of hydrogen concentration (at high concentrations of H/Zr>1.5) is studied. It is found that the hydrogen concentration where the resistivity starts to decrease is very close to the critical concentration of the δ-ϵ phase transition. It is shown that the tetragonal lattice distortion due to the δ-ϵ phase transition of the Zr-H system eliminates imaginary phonon frequencies and the strong electron-phonon coupling of the δ phase and, as a result, leads to the reduction of the electrical resistivity of the Zr-H system at a high hydrogen concentration.

AB - This paper presents the first-principles calculation of the electron-phonon coupling and the temperature dependence of the intrinsic electrical resistivity of the zirconium-hydrogen system with various hydrogen concentrations. The nature of the anomalous decrease in the electrical resistivity of the Zr-H system with the increase of hydrogen concentration (at high concentrations of H/Zr>1.5) is studied. It is found that the hydrogen concentration where the resistivity starts to decrease is very close to the critical concentration of the δ-ϵ phase transition. It is shown that the tetragonal lattice distortion due to the δ-ϵ phase transition of the Zr-H system eliminates imaginary phonon frequencies and the strong electron-phonon coupling of the δ phase and, as a result, leads to the reduction of the electrical resistivity of the Zr-H system at a high hydrogen concentration.

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