Anisotropy in the thermal hysteresis of resistivity and charge density wave nature of single crystal SrFeO3-δ: X-ray absorption and photoemission studies

Abstract The local electronic and atomic structures of the high-quality single crystal of SrFeO3-δ (δ~0.19) were studied using temperature-dependent x-ray absorption and valence-band photoemission spectroscopy (VB-PES) to investigate the origin of anisotropic resistivity in the ab-plane and along th...

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Autores principales:	S. H. Hsieh, R. S. Solanki, Y. F. Wang, Y. C. Shao, S. H. Lee, C. H. Yao, C. H. Du, H. T. Wang, J. W. Chiou, Y. Y. Chin, H. M. Tsai, J.-L. Chen, C. W. Pao, C.-M. Cheng, W.-C. Chen, H. J. Lin, J. F. Lee, F. C. Chou, W. F. Pong
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/e6f9084eab144ec88424c78c2f50bb94
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spelling	oai:doaj.org-article:e6f9084eab144ec88424c78c2f50bb942021-12-02T12:32:50ZAnisotropy in the thermal hysteresis of resistivity and charge density wave nature of single crystal SrFeO3-δ: X-ray absorption and photoemission studies10.1038/s41598-017-00247-z2045-2322https://doaj.org/article/e6f9084eab144ec88424c78c2f50bb942017-03-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-00247-zhttps://doaj.org/toc/2045-2322Abstract The local electronic and atomic structures of the high-quality single crystal of SrFeO3-δ (δ~0.19) were studied using temperature-dependent x-ray absorption and valence-band photoemission spectroscopy (VB-PES) to investigate the origin of anisotropic resistivity in the ab-plane and along the c-axis close to the region of thermal hysteresis (near temperature for susceptibility maximum, Tm~78 K). All experiments herein were conducted during warming and cooling processes. The Fe L 3,2-edge X-ray linear dichroism results show that during cooling from room temperature to below the transition temperature, the unoccupied Fe 3d e g states remain in persistently out-of-plane 3d 3z 2 -r 2 orbitals. In contrast, in the warming process below the transition temperature, they change from 3d 3z 2 -r 2 to in-plane 3d x 2 -y 2 orbitals. The nearest-neighbor (NN) Fe-O bond lengths also exhibit anisotropic behavior in the ab-plane and along the c-axis below Tm. The anisotropic NN Fe-O bond lengths and Debye-Waller factors stabilize the in-plane Fe 3d x 2 -y 2 and out-of-plane 3d 3z 2 -r 2 orbitals during warming and cooling, respectively. Additionally, a VB-PES study further confirms that a relative band gap opens at low temperature in both the ab-plane and along the c-axis, providing the clear evidence of the charge-density-wave nature of SrFeO3-δ (δ~0.19) single crystal.S. H. HsiehR. S. SolankiY. F. WangY. C. ShaoS. H. LeeC. H. YaoC. H. DuH. T. WangJ. W. ChiouY. Y. ChinH. M. TsaiJ.-L. ChenC. W. PaoC.-M. ChengW.-C. ChenH. J. LinJ. F. LeeF. C. ChouW. F. PongNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-11 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q S. H. Hsieh R. S. Solanki Y. F. Wang Y. C. Shao S. H. Lee C. H. Yao C. H. Du H. T. Wang J. W. Chiou Y. Y. Chin H. M. Tsai J.-L. Chen C. W. Pao C.-M. Cheng W.-C. Chen H. J. Lin J. F. Lee F. C. Chou W. F. Pong Anisotropy in the thermal hysteresis of resistivity and charge density wave nature of single crystal SrFeO3-δ: X-ray absorption and photoemission studies
description	Abstract The local electronic and atomic structures of the high-quality single crystal of SrFeO3-δ (δ~0.19) were studied using temperature-dependent x-ray absorption and valence-band photoemission spectroscopy (VB-PES) to investigate the origin of anisotropic resistivity in the ab-plane and along the c-axis close to the region of thermal hysteresis (near temperature for susceptibility maximum, Tm~78 K). All experiments herein were conducted during warming and cooling processes. The Fe L 3,2-edge X-ray linear dichroism results show that during cooling from room temperature to below the transition temperature, the unoccupied Fe 3d e g states remain in persistently out-of-plane 3d 3z 2 -r 2 orbitals. In contrast, in the warming process below the transition temperature, they change from 3d 3z 2 -r 2 to in-plane 3d x 2 -y 2 orbitals. The nearest-neighbor (NN) Fe-O bond lengths also exhibit anisotropic behavior in the ab-plane and along the c-axis below Tm. The anisotropic NN Fe-O bond lengths and Debye-Waller factors stabilize the in-plane Fe 3d x 2 -y 2 and out-of-plane 3d 3z 2 -r 2 orbitals during warming and cooling, respectively. Additionally, a VB-PES study further confirms that a relative band gap opens at low temperature in both the ab-plane and along the c-axis, providing the clear evidence of the charge-density-wave nature of SrFeO3-δ (δ~0.19) single crystal.
format	article
author	S. H. Hsieh R. S. Solanki Y. F. Wang Y. C. Shao S. H. Lee C. H. Yao C. H. Du H. T. Wang J. W. Chiou Y. Y. Chin H. M. Tsai J.-L. Chen C. W. Pao C.-M. Cheng W.-C. Chen H. J. Lin J. F. Lee F. C. Chou W. F. Pong
author_facet	S. H. Hsieh R. S. Solanki Y. F. Wang Y. C. Shao S. H. Lee C. H. Yao C. H. Du H. T. Wang J. W. Chiou Y. Y. Chin H. M. Tsai J.-L. Chen C. W. Pao C.-M. Cheng W.-C. Chen H. J. Lin J. F. Lee F. C. Chou W. F. Pong
author_sort	S. H. Hsieh
title	Anisotropy in the thermal hysteresis of resistivity and charge density wave nature of single crystal SrFeO3-δ: X-ray absorption and photoemission studies
title_short	Anisotropy in the thermal hysteresis of resistivity and charge density wave nature of single crystal SrFeO3-δ: X-ray absorption and photoemission studies
title_full	Anisotropy in the thermal hysteresis of resistivity and charge density wave nature of single crystal SrFeO3-δ: X-ray absorption and photoemission studies
title_fullStr	Anisotropy in the thermal hysteresis of resistivity and charge density wave nature of single crystal SrFeO3-δ: X-ray absorption and photoemission studies
title_full_unstemmed	Anisotropy in the thermal hysteresis of resistivity and charge density wave nature of single crystal SrFeO3-δ: X-ray absorption and photoemission studies
title_sort	anisotropy in the thermal hysteresis of resistivity and charge density wave nature of single crystal srfeo3-δ: x-ray absorption and photoemission studies
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/e6f9084eab144ec88424c78c2f50bb94
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Anisotropy in the thermal hysteresis of resistivity and charge density wave nature of single crystal SrFeO3-δ: X-ray absorption and photoemission studies

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