Evolution of lattice, spin, and charge properties across the phase diagram of FeSe\(_{1-x}\)S\(_x\)
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 \(0\le x \le 1\), of temperature and of scattering symmetry. All type of excitations including phonons, spins and...
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Published in | arXiv.org |
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Main Authors | , , , , , , , , , , , , , |
Format | Paper |
Language | English |
Published |
Ithaca
Cornell University Library, arXiv.org
04.02.2022
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Subjects | |
Online Access | Get full text |
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Summary: | 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 \(0\le x \le 1\), of temperature and of scattering symmetry. All type of excitations including phonons, spins and charges are analyzed in detail. It is observed that the energy and width of iron-related B\(_{1g}\) phonon mode vary continuously across the entire range of sulfur substitution. The A\(_{1g}\) 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\(_{1g}\) symmetry vary discontinuously. The magnetic excitation centered at approximately 500 cm\(^{-1}\) disappears above \(x=0.23\) where the A\(_{1g}\) lattice excitations exhibit a discontinuous change in energy. The low-energy mode associated with fluctuations displays maximal intensity at the nemato-structural transition and thus tracks the phase boundary. |
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ISSN: | 2331-8422 |
DOI: | 10.48550/arxiv.2202.02227 |