Molecular beam epitaxy preparation and in situ characterization of FeTe thin films

V. M. Pereira; C. N. Wu; C. E. Liu; S. C. Liao; C. F. Chang; C. Y. Kuo; C. Koz; U. Schwarz; H. J. Lin; C. T. Chen; L. H. Tjeng; S. G. Altendorf

doi:10.1103/PhysRevMaterials.4.023405

Molecular beam epitaxy preparation and in situ characterization of FeTe thin films

V. M. Pereira, C. N. Wu, C. E. Liu, S. C. Liao, C. F. Chang, C. Y. Kuo, C. Koz, U. Schwarz, H. J. Lin, C. T. Chen, L. H. Tjeng, S. G. Altendorf

電子物理學系

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5 引文斯高帕斯（Scopus）

摘要

We have synthesized Fe1+yTe thin films by means of molecular beam epitaxy (MBE) under Te-limited growth conditions. We found that epitaxial layer-by-layer growth is possible for a wide range of excess Fe values, wider than expected from what is known from studies on the bulk material. Using x-ray magnetic circular dichroism spectroscopy at the Fe L2,3 and Te M4,5 edges, we observed that films with high excess Fe contain ferromagnetic clusters while films with lower excess Fe remain nonmagnetic. Moreover, x-ray absorption spectroscopy showed that it is possible to obtain films with very similar electronic structure as that of a high quality bulk single crystal Fe1.14Te. Our results suggest that MBE with Te-limited growth may provide an opportunity to synthesize FeTe films with smaller amounts of excess Fe as to come closer to a possible superconducting phase.

原文	English
文章編號	023405
期刊	Physical Review Materials
卷	4
發行號	2
DOIs	https://doi.org/10.1103/PhysRevMaterials.4.023405
出版狀態	Published - 28 2月 2020

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title = "Molecular beam epitaxy preparation and in situ characterization of FeTe thin films",

abstract = "We have synthesized Fe1+yTe thin films by means of molecular beam epitaxy (MBE) under Te-limited growth conditions. We found that epitaxial layer-by-layer growth is possible for a wide range of excess Fe values, wider than expected from what is known from studies on the bulk material. Using x-ray magnetic circular dichroism spectroscopy at the Fe L2,3 and Te M4,5 edges, we observed that films with high excess Fe contain ferromagnetic clusters while films with lower excess Fe remain nonmagnetic. Moreover, x-ray absorption spectroscopy showed that it is possible to obtain films with very similar electronic structure as that of a high quality bulk single crystal Fe1.14Te. Our results suggest that MBE with Te-limited growth may provide an opportunity to synthesize FeTe films with smaller amounts of excess Fe as to come closer to a possible superconducting phase.",

author = "Pereira, {V. M.} and Wu, {C. N.} and Liu, {C. E.} and Liao, {S. C.} and Chang, {C. F.} and Kuo, {C. Y.} and C. Koz and U. Schwarz and Lin, {H. J.} and Chen, {C. T.} and Tjeng, {L. H.} and Altendorf, {S. G.}",

year = "2020",

month = feb,

day = "28",

doi = "10.1103/PhysRevMaterials.4.023405",

language = "English",

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T1 - Molecular beam epitaxy preparation and in situ characterization of FeTe thin films

AU - Pereira, V. M.

AU - Wu, C. N.

AU - Liu, C. E.

AU - Liao, S. C.

AU - Chang, C. F.

AU - Kuo, C. Y.

AU - Koz, C.

AU - Schwarz, U.

AU - Lin, H. J.

AU - Chen, C. T.

AU - Tjeng, L. H.

AU - Altendorf, S. G.

PY - 2020/2/28

Y1 - 2020/2/28

N2 - We have synthesized Fe1+yTe thin films by means of molecular beam epitaxy (MBE) under Te-limited growth conditions. We found that epitaxial layer-by-layer growth is possible for a wide range of excess Fe values, wider than expected from what is known from studies on the bulk material. Using x-ray magnetic circular dichroism spectroscopy at the Fe L2,3 and Te M4,5 edges, we observed that films with high excess Fe contain ferromagnetic clusters while films with lower excess Fe remain nonmagnetic. Moreover, x-ray absorption spectroscopy showed that it is possible to obtain films with very similar electronic structure as that of a high quality bulk single crystal Fe1.14Te. Our results suggest that MBE with Te-limited growth may provide an opportunity to synthesize FeTe films with smaller amounts of excess Fe as to come closer to a possible superconducting phase.

AB - We have synthesized Fe1+yTe thin films by means of molecular beam epitaxy (MBE) under Te-limited growth conditions. We found that epitaxial layer-by-layer growth is possible for a wide range of excess Fe values, wider than expected from what is known from studies on the bulk material. Using x-ray magnetic circular dichroism spectroscopy at the Fe L2,3 and Te M4,5 edges, we observed that films with high excess Fe contain ferromagnetic clusters while films with lower excess Fe remain nonmagnetic. Moreover, x-ray absorption spectroscopy showed that it is possible to obtain films with very similar electronic structure as that of a high quality bulk single crystal Fe1.14Te. Our results suggest that MBE with Te-limited growth may provide an opportunity to synthesize FeTe films with smaller amounts of excess Fe as to come closer to a possible superconducting phase.

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DO - 10.1103/PhysRevMaterials.4.023405

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VL - 4

JO - Physical Review Materials

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Molecular beam epitaxy preparation and in situ characterization of FeTe thin films

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