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  Nematic state of the FeSe superconductor

Rößler, S., Coduri, M., Tsirlin, A. A., Ritter, C., Cuello, G., Koz, C., et al. (2022). Nematic state of the FeSe superconductor. Physical Review B, 105(6): 064505, pp. 1-8. doi:10.1103/PhysRevB.105.064505.

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 Creators:
Rößler, Sahana1, Author           
Coduri, Mauro2, Author
Tsirlin, Alexander A.2, Author
Ritter, Clemens2, Author
Cuello, Gabriel2, Author
Koz, Cevriye3, Author           
Muzica, Liudmila3, Author           
Schwarz, Ulrich4, Author           
Rössler, Ulrich K.2, Author
Wirth, Steffen5, Author           
Scavini, Marco2, Author
Affiliations:
1Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863445              
2External Organizations, ou_persistent22              
3Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863405              
4Ulrich Schwarz, Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863423              
5Steffen Wirth, Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863460              

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 Abstract: We study the crystal structure of the tetragonal iron selenide FeSe and its nematic phase transition to the low-temperature orthorhombic structure using synchrotron x-ray and neutron scattering analyzed in both real space and reciprocal space. We show that in the local structure the orthorhombic distortion associated with the electronically driven nematic order is more pronounced at short length scales. It also survives to temperatures above 90 K, where reciprocal-space analysis suggests tetragonal symmetry. Additionally, the real-space pair distribution function analysis of the synchrotron x-ray diffraction data reveals a tiny broadening of the peaks corresponding to the nearest Fe-Fe, nearest Fe-Se, and next-nearest Fe-Se bond distances as well as the tetrahedral torsion angles at a short length scale of 20 angstrom. This broadening appears below 20 K and is attributed to a pseudogap. However, we did not observe any further reduction in local symmetry below orthorhombic down to 3 K. Our results suggest that the superconducting gap anisotropy in FeSe is not associated with any symmetry-lowering short-range structural correlations.

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Language(s): eng - English
 Dates: 2022-02-092022-02-09
 Publication Status: Issued
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Title: Physical Review B
  Abbreviation : Phys. Rev. B
Source Genre: Journal
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Publ. Info: Woodbury, NY : American Physical Society
Pages: - Volume / Issue: 105 (6) Sequence Number: 064505 Start / End Page: 1 - 8 Identifier: ISSN: 1098-0121
CoNE: https://pure.mpg.de/cone/journals/resource/954925225008