Surface alloying and iron selenide formation in Fe/Bi2Se3(0001) observed by x-ray absorption fine structure experiments

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Surface alloying and iron selenide formation in Fe/Bi2Se3(0001) observed by x-ray absorption fine structure experiments	794 KB	Adobe Acrobat PDF	Read	Download
DOI Доступ к ресурсу на сайте издателя			10.1103/PhysRevB.92.045423

Title: Surface alloying and iron selenide formation in Fe/Bi2Se3(0001) observed by x-ray absorption fine structure experiments
Creator: Polyakov, A.
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Crozier, E. Daryl
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Gordon, R. A.
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Mohseni, Katayoon
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Roy, S.
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Ernst, A.
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Vergniory, M. G.
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Zubizarreta, X.
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Otrokov, Mikhail M.
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Meyerheim, Holger L.
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Chulkov, Evgueni V.
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Kirschner, J.
Date: 2015
DOI: 10.1103/PhysRevB.92.045423
Description: The atomic structure of ultrathin iron films deposited on the (0001) surface of the topological insulator Bi2Se3 is analyzed by surface x-ray absorption spectroscopy. Iron atoms deposited on a Bi2Se3 (0001) surface kept at 160 K substitute bismuth atoms within the first quintuple layer. Iron atoms are neighbored by six selenium atoms at a distance in the 2.4 Å range indicating substantial atomic relaxations. Mild annealing up to 520 K leads to the formation of α-FeSe, characterized by a local order extending up to the sixth shell (5.80 Å). Ab initio calculations predict a noncollinear magnetic ordering with a transition temperature of 3.5–10 K depending on the iron concentration and the number of the layers in which Fe is located.