Strain derivative of thermoelectric properties as a sensitive probe for nematicity

Abstract The nematic instability is an undebatable ingredient of the physics of iron-based superconductors. Yet, its origin remains enigmatic as it involves a fermiology with an intricate interplay of lattice-, orbital-, and spin degrees of freedom. It is well known that thermoelectric transport is...

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Autores principales:	F. Caglieris, C. Wuttke, X. C. Hong, S. Sykora, R. Kappenberger, S. Aswartham, S. Wurmehl, B. Büchner, C. Hess
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Materials of engineering and construction. Mechanics of materials TA401-492 Atomic physics. Constitution and properties of matter QC170-197
Acceso en línea:	https://doaj.org/article/28e7e668f45b42be98f004343e63a3d5
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spelling	oai:doaj.org-article:28e7e668f45b42be98f004343e63a3d52021-12-02T13:17:47ZStrain derivative of thermoelectric properties as a sensitive probe for nematicity10.1038/s41535-021-00324-72397-4648https://doaj.org/article/28e7e668f45b42be98f004343e63a3d52021-03-01T00:00:00Zhttps://doi.org/10.1038/s41535-021-00324-7https://doaj.org/toc/2397-4648Abstract The nematic instability is an undebatable ingredient of the physics of iron-based superconductors. Yet, its origin remains enigmatic as it involves a fermiology with an intricate interplay of lattice-, orbital-, and spin degrees of freedom. It is well known that thermoelectric transport is an excellent probe for revealing even subtle signatures of instabilities and pertinent fluctuations. In this paper, we report a strong response of the thermoelectric transport properties of two underdoped 1111 iron-based superconductors to a vanishingly small strain. By introducing the strain derivative of the Seebeck and the Nernst coefficients, we provide a description of the nematic order parameter, proving the existence of an anisotropic Peltier-tensor beside an anisotropic conductivity tensor. Our measurements reveal that the transport nematic phenomenology is the result of the combined effect of both an anisotropic scattering time and Fermi surface distortions, pointing out that in a realistic description, abreast of the spin fluctuations also the orbital character is a fundamental ingredient. In addition, we show that nematic fluctuations universally relax in a Curie–Weiss fashion above T S in all the elasto-transport measurements and we provide evidences that nematicity must be band selective.F. CaglierisC. WuttkeX. C. HongS. SykoraR. KappenbergerS. AswarthamS. WurmehlB. BüchnerC. HessNature PortfolioarticleMaterials of engineering and construction. Mechanics of materialsTA401-492Atomic physics. Constitution and properties of matterQC170-197ENnpj Quantum Materials, Vol 6, Iss 1, Pp 1-7 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Materials of engineering and construction. Mechanics of materials TA401-492 Atomic physics. Constitution and properties of matter QC170-197
spellingShingle	Materials of engineering and construction. Mechanics of materials TA401-492 Atomic physics. Constitution and properties of matter QC170-197 F. Caglieris C. Wuttke X. C. Hong S. Sykora R. Kappenberger S. Aswartham S. Wurmehl B. Büchner C. Hess Strain derivative of thermoelectric properties as a sensitive probe for nematicity
description	Abstract The nematic instability is an undebatable ingredient of the physics of iron-based superconductors. Yet, its origin remains enigmatic as it involves a fermiology with an intricate interplay of lattice-, orbital-, and spin degrees of freedom. It is well known that thermoelectric transport is an excellent probe for revealing even subtle signatures of instabilities and pertinent fluctuations. In this paper, we report a strong response of the thermoelectric transport properties of two underdoped 1111 iron-based superconductors to a vanishingly small strain. By introducing the strain derivative of the Seebeck and the Nernst coefficients, we provide a description of the nematic order parameter, proving the existence of an anisotropic Peltier-tensor beside an anisotropic conductivity tensor. Our measurements reveal that the transport nematic phenomenology is the result of the combined effect of both an anisotropic scattering time and Fermi surface distortions, pointing out that in a realistic description, abreast of the spin fluctuations also the orbital character is a fundamental ingredient. In addition, we show that nematic fluctuations universally relax in a Curie–Weiss fashion above T S in all the elasto-transport measurements and we provide evidences that nematicity must be band selective.
format	article
author	F. Caglieris C. Wuttke X. C. Hong S. Sykora R. Kappenberger S. Aswartham S. Wurmehl B. Büchner C. Hess
author_facet	F. Caglieris C. Wuttke X. C. Hong S. Sykora R. Kappenberger S. Aswartham S. Wurmehl B. Büchner C. Hess
author_sort	F. Caglieris
title	Strain derivative of thermoelectric properties as a sensitive probe for nematicity
title_short	Strain derivative of thermoelectric properties as a sensitive probe for nematicity
title_full	Strain derivative of thermoelectric properties as a sensitive probe for nematicity
title_fullStr	Strain derivative of thermoelectric properties as a sensitive probe for nematicity
title_full_unstemmed	Strain derivative of thermoelectric properties as a sensitive probe for nematicity
title_sort	strain derivative of thermoelectric properties as a sensitive probe for nematicity
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/28e7e668f45b42be98f004343e63a3d5
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Strain derivative of thermoelectric properties as a sensitive probe for nematicity

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