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Title: Electron-phonon coupling and superconductivity-induced distortion of the phonon lineshape in V 3 Si

Abstract

Phonon measurements in the A15-type superconductors were complicated in the past because of the unavailability of large single crystals for inelastic neutron scattering, e.g., in the case of Nb3Sn, or unfavorable neutron scattering properties in the case of V3Si. Hence, only few studies of the lattice dynamical properties with momentum resolved methods were published, in particular below the superconducting transition temperature Tc. Here, we overcome these problems by employing inelastic x-ray scattering and report a combined experimental and theoretical investigation of lattice dynamics in V3Si with the focus on the temperature-dependent properties of low-energy acoustic phonon modes in several high-symmetry directions. We paid particular attention to the evolution of the soft phonon mode of the structural phase transition observed in our sample at Ts = 18.9 K, i.e., just above the measured superconducting phase transition at Tc = 16.8 K. Theoretically, we predict lattice dynamics including electron-phonon coupling based on density-functional-perturbation theory and discuss the relevance of the soft phonon mode with regard to the value of Tc. Furthermore, we explain superconductivity-induced anomalies in the lineshape of several acoustic phonon modes using a model proposed by Allen et al., [Phys. Rev. B 56, 5552 (19 7)].

Authors:
 [1];  [2];  [3];  [1];  [1];  [1]
  1. Karlsruhe Inst. of Technology (KIT) (Germany)
  2. Karlsruhe Inst. of Technology (KIT) (Germany); Vienna Univ. of Technology (Austria). Inst. of Solid State Physics
  3. Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
Helmholtz Association of German Research Centres; USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1510474
Alternate Identifier(s):
OSTI ID: 1507176
Grant/Contract Number:  
AC02-06CH11357
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 99; Journal Issue: 13; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

Sauer, A., Zocco, D. A., Said, A. H., Heid, R., Böhmer, A., and Weber, F. Electron-phonon coupling and superconductivity-induced distortion of the phonon lineshape in V3Si. United States: N. p., 2019. Web. doi:10.1103/PhysRevB.99.134511.
Sauer, A., Zocco, D. A., Said, A. H., Heid, R., Böhmer, A., & Weber, F. Electron-phonon coupling and superconductivity-induced distortion of the phonon lineshape in V3Si. United States. doi:10.1103/PhysRevB.99.134511.
Sauer, A., Zocco, D. A., Said, A. H., Heid, R., Böhmer, A., and Weber, F. Mon . "Electron-phonon coupling and superconductivity-induced distortion of the phonon lineshape in V3Si". United States. doi:10.1103/PhysRevB.99.134511. https://www.osti.gov/servlets/purl/1510474.
@article{osti_1510474,
title = {Electron-phonon coupling and superconductivity-induced distortion of the phonon lineshape in V3Si},
author = {Sauer, A. and Zocco, D. A. and Said, A. H. and Heid, R. and Böhmer, A. and Weber, F.},
abstractNote = {Phonon measurements in the A15-type superconductors were complicated in the past because of the unavailability of large single crystals for inelastic neutron scattering, e.g., in the case of Nb3Sn, or unfavorable neutron scattering properties in the case of V3Si. Hence, only few studies of the lattice dynamical properties with momentum resolved methods were published, in particular below the superconducting transition temperature Tc. Here, we overcome these problems by employing inelastic x-ray scattering and report a combined experimental and theoretical investigation of lattice dynamics in V3Si with the focus on the temperature-dependent properties of low-energy acoustic phonon modes in several high-symmetry directions. We paid particular attention to the evolution of the soft phonon mode of the structural phase transition observed in our sample at Ts = 18.9 K, i.e., just above the measured superconducting phase transition at Tc = 16.8 K. Theoretically, we predict lattice dynamics including electron-phonon coupling based on density-functional-perturbation theory and discuss the relevance of the soft phonon mode with regard to the value of Tc. Furthermore, we explain superconductivity-induced anomalies in the lineshape of several acoustic phonon modes using a model proposed by Allen et al., [Phys. Rev. B 56, 5552 (19 7)].},
doi = {10.1103/PhysRevB.99.134511},
journal = {Physical Review B},
number = 13,
volume = 99,
place = {United States},
year = {2019},
month = {4}
}

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