Relationship between Transport Anisotropy and Nematicity in FeSe

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 perfor...

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Autores principales:	Jack M. Bartlett, Alexander Steppke, Suguru Hosoi, Hilary Noad, Joonbum Park, Carsten Timm, Takasada Shibauchi, Andrew P. Mackenzie, Clifford W. Hicks
Formato:	article
Lenguaje:	EN
Publicado:	American Physical Society 2021
Materias:	Physics QC1-999
Acceso en línea:	https://doaj.org/article/db643639dc654b8bbc6418a7e7e6c066
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spelling	oai:doaj.org-article:db643639dc654b8bbc6418a7e7e6c0662021-12-02T15:56:29ZRelationship between Transport Anisotropy and Nematicity in FeSe10.1103/PhysRevX.11.0210382160-3308https://doaj.org/article/db643639dc654b8bbc6418a7e7e6c0662021-05-01T00:00:00Zhttp://doi.org/10.1103/PhysRevX.11.021038http://doi.org/10.1103/PhysRevX.11.021038https://doaj.org/toc/2160-3308The 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 T_{s} is determined. (2) Resistive anisotropy is measured as nematicity is induced through applied strain at fixed temperature above T_{s}. 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 T_{c}, consistent with a strong role of the yz orbital in the electronic correlations.Jack M. BartlettAlexander SteppkeSuguru HosoiHilary NoadJoonbum ParkCarsten TimmTakasada ShibauchiAndrew P. MackenzieClifford W. HicksAmerican Physical SocietyarticlePhysicsQC1-999ENPhysical Review X, Vol 11, Iss 2, p 021038 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Physics QC1-999
spellingShingle	Physics QC1-999 Jack M. Bartlett Alexander Steppke Suguru Hosoi Hilary Noad Joonbum Park Carsten Timm Takasada Shibauchi Andrew P. Mackenzie Clifford W. Hicks Relationship between Transport Anisotropy and Nematicity in FeSe
description	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 T_{s} is determined. (2) Resistive anisotropy is measured as nematicity is induced through applied strain at fixed temperature above T_{s}. 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 T_{c}, consistent with a strong role of the yz orbital in the electronic correlations.
format	article
author	Jack M. Bartlett Alexander Steppke Suguru Hosoi Hilary Noad Joonbum Park Carsten Timm Takasada Shibauchi Andrew P. Mackenzie Clifford W. Hicks
author_facet	Jack M. Bartlett Alexander Steppke Suguru Hosoi Hilary Noad Joonbum Park Carsten Timm Takasada Shibauchi Andrew P. Mackenzie Clifford W. Hicks
author_sort	Jack M. Bartlett
title	Relationship between Transport Anisotropy and Nematicity in FeSe
title_short	Relationship between Transport Anisotropy and Nematicity in FeSe
title_full	Relationship between Transport Anisotropy and Nematicity in FeSe
title_fullStr	Relationship between Transport Anisotropy and Nematicity in FeSe
title_full_unstemmed	Relationship between Transport Anisotropy and Nematicity in FeSe
title_sort	relationship between transport anisotropy and nematicity in fese
publisher	American Physical Society
publishDate	2021
url	https://doaj.org/article/db643639dc654b8bbc6418a7e7e6c066
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Relationship between Transport Anisotropy and Nematicity in FeSe

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