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  Relationship between Transport Anisotropy and Nematicity in FeSe

Bartlett, J. M., Steppke, A., Hosoi, S., Noad, H., Park, J., Timm, C., et al. (2021). Relationship between Transport Anisotropy and Nematicity in FeSe. Physical Review X, 11(2): 021038, pp. 1-19. doi:10.1103/PhysRevX.11.021038.

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 Creators:
Bartlett, Jack M.1, Author              
Steppke, Alexander1, Author              
Hosoi, Suguru2, Author
Noad, Hilary1, Author              
Park, Joonbum1, Author              
Timm, Carsten2, Author
Shibauchi, Takasada2, Author
Mackenzie, Andrew P.3, Author              
Hicks, Clifford W.4, Author              
Affiliations:
1Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863462              
2External Organizations, ou_persistent22              
3Andrew Mackenzie, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863463              
4Clifford Hicks, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863466              

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Free keywords: Anisotropy, Iron compounds, Strain, Temperature, Electronic correlation, Electronic instabilities, Fixed temperature, In-plane compression, In-plane resistivity, Intrinsic resistivity, Sample resistance, Superconducting critical temperatures, Selenium compounds
 Abstract: The mechanism behind the nematicity of FeSe is not known. Through elastoresitivity measurements it has been shown to be an electronic instability. However, thus far measurements have extended only to small strains, where the response is linear. Here, we apply large elastic strains to FeSe and perform two types of measurement. (1) Using applied strain to control twinning, the nematic resistive anisotropy at temperatures below the nematic transition temperature Ts is determined. (2) Resistive anisotropy is measured as nematicity is induced through applied strain at fixed temperature above Ts. In both cases, as nematicity strengthens, the resistive anisotropy peaks at about 7%, then decreases. Below ≈40 K, the nematic resistive anisotropy changes sign. We discuss possible implications of this behavior for theories of nematicity. In addition, we report the following. (1) Under experimentally accessible conditions with bulk crystals, stress, rather than strain, is the conjugate field to the nematicity of FeSe. (2) At low temperatures the twin boundary resistance is ∼10% of the sample resistance, and must be properly subtracted to extract intrinsic resistivities. (3) Biaxial in-plane compression increases both in-plane resistivity and the superconducting critical temperature Tc, consistent with a strong role of the yz orbital in the electronic correlations. © 2021 authors. Published by the American Physical Society.

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Language(s): eng - English
 Dates: 2021-05-192021-05-19
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: DOI: 10.1103/PhysRevX.11.021038
 Degree: -

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Title: Physical Review X
  Abbreviation : Phys. Rev. X
Source Genre: Journal
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Publ. Info: New York, NY : American Physical Society
Pages: - Volume / Issue: 11 (2) Sequence Number: 021038 Start / End Page: 1 - 19 Identifier: Other: 2160-3308
CoNE: https://pure.mpg.de/cone/journals/resource/2160-3308