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

Pereira, V. M., Wu, C. N., Liu, C. E., Liao, S.-C., Chang, C.-F., Kuo, C.-Y., et al. (2020). Molecular beam epitaxy preparation and in situ characterization of FeTe thin films. Physical Review Materials, 4(2): 023405, pp. 1-6. doi:10.1103/PhysRevMaterials.4.023405.

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 Creators:
Pereira, V. M.1, Author           
Wu, C. N.1, Author           
Liu, C. E.1, Author           
Liao, S.-C.1, Author           
Chang, C.-F.2, Author           
Kuo, C.-Y.1, Author           
Koz, C.3, Author           
Schwarz, U.4, Author           
Lin, H.-J.5, Author
Chen, C. T.5, Author
Tjeng, L. H.6, Author           
Altendorf, S. G.7, Author           
Affiliations:
1Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863445              
2Chun-Fu Chang, Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863447              
3Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863405              
4Ulrich Schwarz, Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863423              
5External Organizations, ou_persistent22              
6Liu Hao Tjeng, Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863452              
7Simone Altendorf, Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863458              

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 Abstract: We have synthesized Fe1+y Te 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 L-2(,3) and Te M-4(,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 Fe-1.(14) Te. 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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Language(s): eng - English
 Dates: 2020-02-282020-02-28
 Publication Status: Published in print
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Title: Physical Review Materials
  Abbreviation : Phys. Rev. Mat.
Source Genre: Journal
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Publ. Info: College Park, MD : American Physical Society
Pages: - Volume / Issue: 4 (2) Sequence Number: 023405 Start / End Page: 1 - 6 Identifier: ISSN: 2475-9953
CoNE: https://pure.mpg.de/cone/journals/resource/2475-9953