Spin-Orbital-Intertwined Nematic State in FeSe

The importance of the spin-orbit coupling (SOC) effect in Fe-based superconductors (FeSCs) has recently been under hot debate. Considering the Hund’s coupling-induced electronic correlation, the understanding of the role of SOC in FeSCs is not trivial and is still elusive. Here, through a comprehens...

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Autores principales:	J. Li, B. Lei, D. Zhao, L. P. Nie, D. W. Song, L. X. Zheng, S. J. Li, B. L. Kang, X. G. Luo, T. Wu, X. H. Chen
Formato:	article
Lenguaje:	EN
Publicado:	American Physical Society 2020
Materias:	Physics QC1-999
Acceso en línea:	https://doaj.org/article/8da731ce141147ed8c507c96862913eb
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spelling	oai:doaj.org-article:8da731ce141147ed8c507c96862913eb2021-12-02T11:56:41ZSpin-Orbital-Intertwined Nematic State in FeSe10.1103/PhysRevX.10.0110342160-3308https://doaj.org/article/8da731ce141147ed8c507c96862913eb2020-02-01T00:00:00Zhttp://doi.org/10.1103/PhysRevX.10.011034http://doi.org/10.1103/PhysRevX.10.011034https://doaj.org/toc/2160-3308The importance of the spin-orbit coupling (SOC) effect in Fe-based superconductors (FeSCs) has recently been under hot debate. Considering the Hund’s coupling-induced electronic correlation, the understanding of the role of SOC in FeSCs is not trivial and is still elusive. Here, through a comprehensive study of ^{77}Se and ^{57}Fe nuclear magnetic resonance, a nontrivial SOC effect is revealed in the nematic state of FeSe. First, the orbital-dependent spin susceptibility, determined by the anisotropy of the ^{57}Fe Knight shift, indicates a predominant role from the 3d_{xy} orbital, which suggests the coexistence of local and itinerant spin degrees of freedom in the FeSe. Then, we reconfirm that the orbital reconstruction below the nematic transition temperature (T_{nem}∼90 K) happens not only on the 3d_{xz} and 3d_{yz} orbitals but also on the 3d_{xy} orbital, which is beyond a trivial ferro-orbital order picture. Moreover, our results also indicate the development of a coherent coupling between the local and itinerant spin degrees of freedom below T_{nem}, which is ascribed to a Hund’s coupling-induced electronic crossover on the 3d_{xy} orbital. Finally, because of a nontrivial SOC effect, sizable in-plane anisotropy of the spin susceptibility emerges in the nematic state, suggesting a spin-orbital-intertwined nematicity rather than a simple spin- or orbital-driven nematicity. The present work not only reveals a nontrivial SOC effect in the nematic state but also sheds light on the mechanism of nematic transition in FeSe.J. LiB. LeiD. ZhaoL. P. NieD. W. SongL. X. ZhengS. J. LiB. L. KangX. G. LuoT. WuX. H. ChenAmerican Physical SocietyarticlePhysicsQC1-999ENPhysical Review X, Vol 10, Iss 1, p 011034 (2020)
institution	DOAJ
collection	DOAJ
language	EN
topic	Physics QC1-999
spellingShingle	Physics QC1-999 J. Li B. Lei D. Zhao L. P. Nie D. W. Song L. X. Zheng S. J. Li B. L. Kang X. G. Luo T. Wu X. H. Chen Spin-Orbital-Intertwined Nematic State in FeSe
description	The importance of the spin-orbit coupling (SOC) effect in Fe-based superconductors (FeSCs) has recently been under hot debate. Considering the Hund’s coupling-induced electronic correlation, the understanding of the role of SOC in FeSCs is not trivial and is still elusive. Here, through a comprehensive study of ^{77}Se and ^{57}Fe nuclear magnetic resonance, a nontrivial SOC effect is revealed in the nematic state of FeSe. First, the orbital-dependent spin susceptibility, determined by the anisotropy of the ^{57}Fe Knight shift, indicates a predominant role from the 3d_{xy} orbital, which suggests the coexistence of local and itinerant spin degrees of freedom in the FeSe. Then, we reconfirm that the orbital reconstruction below the nematic transition temperature (T_{nem}∼90 K) happens not only on the 3d_{xz} and 3d_{yz} orbitals but also on the 3d_{xy} orbital, which is beyond a trivial ferro-orbital order picture. Moreover, our results also indicate the development of a coherent coupling between the local and itinerant spin degrees of freedom below T_{nem}, which is ascribed to a Hund’s coupling-induced electronic crossover on the 3d_{xy} orbital. Finally, because of a nontrivial SOC effect, sizable in-plane anisotropy of the spin susceptibility emerges in the nematic state, suggesting a spin-orbital-intertwined nematicity rather than a simple spin- or orbital-driven nematicity. The present work not only reveals a nontrivial SOC effect in the nematic state but also sheds light on the mechanism of nematic transition in FeSe.
format	article
author	J. Li B. Lei D. Zhao L. P. Nie D. W. Song L. X. Zheng S. J. Li B. L. Kang X. G. Luo T. Wu X. H. Chen
author_facet	J. Li B. Lei D. Zhao L. P. Nie D. W. Song L. X. Zheng S. J. Li B. L. Kang X. G. Luo T. Wu X. H. Chen
author_sort	J. Li
title	Spin-Orbital-Intertwined Nematic State in FeSe
title_short	Spin-Orbital-Intertwined Nematic State in FeSe
title_full	Spin-Orbital-Intertwined Nematic State in FeSe
title_fullStr	Spin-Orbital-Intertwined Nematic State in FeSe
title_full_unstemmed	Spin-Orbital-Intertwined Nematic State in FeSe
title_sort	spin-orbital-intertwined nematic state in fese
publisher	American Physical Society
publishDate	2020
url	https://doaj.org/article/8da731ce141147ed8c507c96862913eb
work_keys_str_mv	AT jli spinorbitalintertwinednematicstateinfese AT blei spinorbitalintertwinednematicstateinfese AT dzhao spinorbitalintertwinednematicstateinfese AT lpnie spinorbitalintertwinednematicstateinfese AT dwsong spinorbitalintertwinednematicstateinfese AT lxzheng spinorbitalintertwinednematicstateinfese AT sjli spinorbitalintertwinednematicstateinfese AT blkang spinorbitalintertwinednematicstateinfese AT xgluo spinorbitalintertwinednematicstateinfese AT twu spinorbitalintertwinednematicstateinfese AT xhchen spinorbitalintertwinednematicstateinfese
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Spin-Orbital-Intertwined Nematic State in FeSe

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