Epitaxial thin films of pyrochlore iridate Bi2+xIr2-yO7-δ: structure, defects and transport properties

Abstract While pyrochlore iridate thin films are theoretically predicted to possess a variety of emergent topological properties, experimental verification of these predictions can be obstructed by the challenge in thin film growth. Here we report on the pulsed laser deposition and characterization...

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Autores principales:	W. C. Yang, Y. T. Xie, W. K. Zhu, K. Park, A. P. Chen, Y. Losovyj, Z. Li, H. M. Liu, M. Starr, J. A. Acosta, C. G. Tao, N. Li, Q. X. Jia, J. J. Heremans, S. X. Zhang
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/26e665e4d5574d89a3ed3c826d1b85b5
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spelling	oai:doaj.org-article:26e665e4d5574d89a3ed3c826d1b85b52021-12-02T15:06:25ZEpitaxial thin films of pyrochlore iridate Bi2+xIr2-yO7-δ: structure, defects and transport properties10.1038/s41598-017-06785-w2045-2322https://doaj.org/article/26e665e4d5574d89a3ed3c826d1b85b52017-08-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-06785-whttps://doaj.org/toc/2045-2322Abstract While pyrochlore iridate thin films are theoretically predicted to possess a variety of emergent topological properties, experimental verification of these predictions can be obstructed by the challenge in thin film growth. Here we report on the pulsed laser deposition and characterization of thin films of a representative pyrochlore compound Bi2Ir2O7. The films were epitaxially grown on yttria-stabilized zirconia substrates and have lattice constants that are a few percent larger than that of the bulk single crystals. The film composition shows a strong dependence on the oxygen partial pressure. Density-functional-theory calculations indicate the existence of BiIr antisite defects, qualitatively consistent with the high Bi: Ir ratio found in the films. Both Ir and Bi have oxidation states that are lower than their nominal values, suggesting the existence of oxygen deficiency. The iridate thin films show a variety of intriguing transport characteristics, including multiple charge carriers, logarithmic dependence of resistance on temperature, antilocalization corrections to conductance due to spin-orbit interactions, and linear positive magnetoresistance.W. C. YangY. T. XieW. K. ZhuK. ParkA. P. ChenY. LosovyjZ. LiH. M. LiuM. StarrJ. A. AcostaC. G. TaoN. LiQ. X. JiaJ. J. HeremansS. X. ZhangNature 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 W. C. Yang Y. T. Xie W. K. Zhu K. Park A. P. Chen Y. Losovyj Z. Li H. M. Liu M. Starr J. A. Acosta C. G. Tao N. Li Q. X. Jia J. J. Heremans S. X. Zhang Epitaxial thin films of pyrochlore iridate Bi2+xIr2-yO7-δ: structure, defects and transport properties
description	Abstract While pyrochlore iridate thin films are theoretically predicted to possess a variety of emergent topological properties, experimental verification of these predictions can be obstructed by the challenge in thin film growth. Here we report on the pulsed laser deposition and characterization of thin films of a representative pyrochlore compound Bi2Ir2O7. The films were epitaxially grown on yttria-stabilized zirconia substrates and have lattice constants that are a few percent larger than that of the bulk single crystals. The film composition shows a strong dependence on the oxygen partial pressure. Density-functional-theory calculations indicate the existence of BiIr antisite defects, qualitatively consistent with the high Bi: Ir ratio found in the films. Both Ir and Bi have oxidation states that are lower than their nominal values, suggesting the existence of oxygen deficiency. The iridate thin films show a variety of intriguing transport characteristics, including multiple charge carriers, logarithmic dependence of resistance on temperature, antilocalization corrections to conductance due to spin-orbit interactions, and linear positive magnetoresistance.
format	article
author	W. C. Yang Y. T. Xie W. K. Zhu K. Park A. P. Chen Y. Losovyj Z. Li H. M. Liu M. Starr J. A. Acosta C. G. Tao N. Li Q. X. Jia J. J. Heremans S. X. Zhang
author_facet	W. C. Yang Y. T. Xie W. K. Zhu K. Park A. P. Chen Y. Losovyj Z. Li H. M. Liu M. Starr J. A. Acosta C. G. Tao N. Li Q. X. Jia J. J. Heremans S. X. Zhang
author_sort	W. C. Yang
title	Epitaxial thin films of pyrochlore iridate Bi2+xIr2-yO7-δ: structure, defects and transport properties
title_short	Epitaxial thin films of pyrochlore iridate Bi2+xIr2-yO7-δ: structure, defects and transport properties
title_full	Epitaxial thin films of pyrochlore iridate Bi2+xIr2-yO7-δ: structure, defects and transport properties
title_fullStr	Epitaxial thin films of pyrochlore iridate Bi2+xIr2-yO7-δ: structure, defects and transport properties
title_full_unstemmed	Epitaxial thin films of pyrochlore iridate Bi2+xIr2-yO7-δ: structure, defects and transport properties
title_sort	epitaxial thin films of pyrochlore iridate bi2+xir2-yo7-δ: structure, defects and transport properties
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/26e665e4d5574d89a3ed3c826d1b85b5
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Epitaxial thin films of pyrochlore iridate Bi2+xIr2-yO7-δ: structure, defects and transport properties

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