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. 2019 Sep 13;9:13233. doi: 10.1038/s41598-019-49654-4

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© The Author(s) 2019

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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(a) Crystal structure and (b) X-ray energy-dispersive spectrum of Fe_3−xGeTe₂ single crystal. Inset shows a photograph of Fe_3−xGeTe₂ single crystal on a 1 mm grid. (c) X-ray diffraction (XRD) pattern of Fe_3−xGeTe₂. Inset shows the electron diffraction pattern taken along the [001] zone axis direction. (d) Temperature dependence of the reduced magnetization with out-of-plane field of Fe_3−xGeTe₂ fitted using spin-wave (SW) model and single-particle (SP) model. Inset shows the temperature dependence of zero-field-cooling (ZFC) magnetization of Fe_3−xGeTe₂ measured at H = 1 T applied along the c axis.