Electron-phonon coupling and superconductivity-induced distortion of the phonon lineshape in V3Si

Sauer, A.; Zocco, D. A.; Said, A. H.; Heid, R.; Böhmer, A.; Weber, F.

doi:10.1103/PhysRevB.99.134511

Title: Electron-phonon coupling and superconductivity-induced distortion of the phonon lineshape in $V_{3} Si$

Journal Article · Mon Apr 15 00:00:00 EDT 2019 · Physical Review B

DOI:https://doi.org/10.1103/PhysRevB.99.134511· OSTI ID:1510474

Sauer, A. ^[1]; Zocco, D. A. ^[2]; Said, A. H. ^[3]; Heid, R. ^[1]; Böhmer, A. ^[1]; Weber, F. ^[1]

Karlsruhe Inst. of Technology (KIT) (Germany)
Karlsruhe Inst. of Technology (KIT) (Germany); Vienna Univ. of Technology (Austria). Inst. of Solid State Physics
Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)

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 T_c. 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 T_s = 18.9 K, i.e., just above the measured superconducting phase transition at T_c = 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 T_c. 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)].

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Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States)

Sponsoring Organization:: Helmholtz Association of German Research Centres; USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC02-06CH11357

OSTI ID:: 1510474

Alternate ID(s):: OSTI ID: 1507176

Journal Information:: Physical Review B, Vol. 99, Issue 13; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 3 works

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