Evolution of lattice, spin, and charge properties across the phase diagram of ${\mathrm{FeSe}}_{1\ensuremath{-}x}{\mathrm{S}}_{x}$

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Evolution of lattice, spin, and charge properties across the phase diagram of ${FeSe}_{1 - x} S_{x}$

N. Lazarević, A. Baum, A. Milosavljević, L. Peis, R. Stumberger, J. Bekaert, A. Šolajić, J. Pešić, Aifeng Wang, M. Šćepanović, A. M. Milinda Abeykoon, M. V. Milošević, C. Petrovic, Z. V. Popović, and R. Hackl

Phys. Rev. B 106, 094510 – Published 19 September 2022

Abstract

A Raman scattering study covering the entire substitution range of the ${FeSe}_{1 - x} S_{x}$ solid solution is presented. Data were taken as a function of sulfur concentration $x$ for $0 \leq x \leq 1$ , of temperature and of scattering symmetry. All types of excitations including phonons, spins, and charges are analyzed in detail. It is observed that the energy and width of the iron-related $B_{1 g}$ phonon mode vary continuously across the entire range of sulfur substitution. The $A_{1 g}$ chalcogenide mode disappears above $x = 0.23$ and reappears at a much higher energy for $x = 0.69$ . In a similar way the spectral features appearing at finite doping in $A_{1 g}$ symmetry vary discontinuously. The magnetic excitation centered at approximately 500 ${cm}^{- 1}$ disappears above $x = 0.23$ where the $A_{1 g}$ lattice excitations exhibit a discontinuous change in energy. The low-energy mode associated with fluctuations displays maximal intensity at the nematostructural transition and thus tracks the phase boundary.

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Received 9 March 2022
Revised 27 July 2022
Accepted 26 August 2022

DOI:https://doi.org/10.1103/PhysRevB.106.094510

Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.

Published by the American Physical Society

Physics Subject Headings (PhySH)

Phonons Quasiparticles & collective excitations Spin fluctuations

High-temperature superconductors Iron-based superconductors

Raman spectroscopy

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

N. Lazarević ^1,*, A. Baum^2,3,*, A. Milosavljević¹, L. Peis ^2,3,†, R. Stumberger^2,3,‡, J. Bekaert ⁴, A. Šolajić¹, J. Pešić ¹, Aifeng Wang⁵, M. Šćepanović¹, A. M. Milinda Abeykoon⁶, M. V. Milošević⁴, C. Petrovic⁷, Z. V. Popović^1,8, and R. Hackl^2,3,9

¹Center for Solid State Physics and New Materials, Institute of Physics Belgrade, University of Belgrade, Pregrevica 118, 11080 Belgrade, Serbia
²Walther Meissner Institut, Bayerische Akademie der Wissenschaften, 85748 Garching, Germany
³Fakultät für Physik, Technische Universität München, 85478 Garching, Germany
⁴Department of Physics, University of Antwerp, Groenenborgerlaan 171, B-2020 Antwerp, Belgium
⁵School of Physics, Chongqing University, Chongqing 400044, China
⁶National Synchrotron Light Source II, Brookhaven National Laboratory, Upton, New York 11973, USA
⁷Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, New York 11973-5000, USA
⁸Serbian Academy of Sciences and Arts, Kneza Mihaila 35, 11000 Belgrade, Serbia
⁹IFW Dresden, Helmholtzstr. 20, 01069 Dresden, Germany

^*These authors contributed equally to this work.
^†Present Address: IFW Dresden, Helmholtzstr. 20, 01069 Dresden, Germany.
^‡Present Address: Robert Bosch GmbH, Robert-Bosch-Platz 1, 70839 Gerlingen, Germany.

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Vol. 106, Iss. 9 — 1 September 2022

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Physical Review B

covering condensed matter and materials physics

Evolution of lattice, spin, and charge properties across the phase diagram of ${FeSe}_{1 - x} S_{x}$

N. Lazarević, A. Baum, A. Milosavljević, L. Peis, R. Stumberger, J. Bekaert, A. Šolajić, J. Pešić, Aifeng Wang, M. Šćepanović, A. M. Milinda Abeykoon, M. V. Milošević, C. Petrovic, Z. V. Popović, and R. Hackl

Phys. Rev. B 106, 094510 – Published 19 September 2022

Abstract

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Physical Review B

covering condensed matter and materials physics

Evolution of lattice, spin, and charge properties across the phase diagram of FeSe1−xSx

N. Lazarević, A. Baum, A. Milosavljević, L. Peis, R. Stumberger, J. Bekaert, A. Šolajić, J. Pešić, Aifeng Wang, M. Šćepanović, A. M. Milinda Abeykoon, M. V. Milošević, C. Petrovic, Z. V. Popović, and R. Hackl

Phys. Rev. B 106, 094510 – Published 19 September 2022

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Evolution of lattice, spin, and charge properties across the phase diagram of ${FeSe}_{1 - x} S_{x}$