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Tytuł:
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Ferromagnetic Layers in a Topological Insulator (Bi,Sb) 2 Te 3 Crystal Doped with Mn.
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Autorzy:
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Frolov AS; Lomonosov Moscow State University, Leninskie Gory 1/3, 119991Moscow, Russia.; N.N. Semenov Federal Research Center for Chemical Physics, Kosygina Street 4, 119991Moscow, Russia.
Usachov DY; St. Petersburg State University, 7/9 Universitetskaya nab., 199034St. Petersburg, Russia.
Fedorov AV; Helmholtz-Zentrum Berlin für Materialien und Energie, Elektronenspeicherring BESSY II, Albert-Einstein-Strasse 15, 12489Berlin, Germany.
Vilkov OY; St. Petersburg State University, 7/9 Universitetskaya nab., 199034St. Petersburg, Russia.
Golyashov V; Novosibirsk State University, ul. Pirogova 2, 630090Novosibirsk, Russia.; Synchrotron Radiation Facility SKIF, Boreskov Institute of Catalysis SB RAS, pr. Nikolsky 1, 630559Kol'tsovo, Russia.
Tereshchenko OE; Novosibirsk State University, ul. Pirogova 2, 630090Novosibirsk, Russia.; Synchrotron Radiation Facility SKIF, Boreskov Institute of Catalysis SB RAS, pr. Nikolsky 1, 630559Kol'tsovo, Russia.
Bogomyakov AS; International Tomography Center, SB RAS, Institutskaya, 3a, Novosibirsk630090, Russia.
Kokh K; Sobolev Institute of Geology and Mineralogy, Siberian Branch, Russian Academy of Sciences, Koptyuga pr. 3, 630090Novosibirsk, Russia.; Kemerovo State University, Kemerovo, 650000, Russia.
Muntwiler M; Photon Science Division, Paul Scherrer Institute, 5232Villigen PSI, Switzerland.
Amati M; Elettra-Sincrotrone Trieste S.C.p.A, Area Science Park, Strada Statale 14, Km 163.5, Basovizza, Trieste34149, Italy.
Gregoratti L; Elettra-Sincrotrone Trieste S.C.p.A, Area Science Park, Strada Statale 14, Km 163.5, Basovizza, Trieste34149, Italy.
Sirotina AP; N.N. Semenov Federal Research Center for Chemical Physics, Kosygina Street 4, 119991Moscow, Russia.; Institute of Nanotechnology of Microelectronics RAS, Nagatinskaya str., 16A/11, 115487Moscow, Russia.
Abakumov AM; Center for Energy Science and Technology, Skolkovo Institute of Science and Technology, Nobel str. 3, 143026Moscow, Russia.
Sánchez-Barriga J; Helmholtz-Zentrum Berlin für Materialien und Energie, Elektronenspeicherring BESSY II, Albert-Einstein-Strasse 15, 12489Berlin, Germany.; IMDEA Nanoscience, C/Faraday 9, Campus de Cantoblanco, 28049Madrid, Spain.
Yashina LV; Lomonosov Moscow State University, Leninskie Gory 1/3, 119991Moscow, Russia.; N.N. Semenov Federal Research Center for Chemical Physics, Kosygina Street 4, 119991Moscow, Russia.
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Źródło:
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ACS nano [ACS Nano] 2022 Dec 27; Vol. 16 (12), pp. 20831-20841. Date of Electronic Publication: 2022 Nov 15.
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Typ publikacji:
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Journal Article
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Język:
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English
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Imprint Name(s):
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Original Publication: Washington D.C. : American Chemical Society
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Contributed Indexing:
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Keywords: ARPES; electron band structure; ferromagnetism; magnetic topological insulators; photoelectron diffraction; surface structure
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Entry Date(s):
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Date Created: 20221115 Date Completed: 20230105 Latest Revision: 20230111
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Update Code:
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20240104
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DOI:
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10.1021/acsnano.2c08217
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PMID:
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36378602
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Magnetic topological insulators (MTIs) have recently become a subject of poignant interest; among them, Z 2 topological insulators with magnetic moment ordering caused by embedded magnetic atoms attract special attention. In such systems, the case of magnetic anisotropy perpendicular to the surface that holds a topologically nontrivial surface state is the most intriguing one. Such materials demonstrate the quantum anomalous Hall effect, which manifests itself as chiral edge conduction channels that can be manipulated by switching the polarization of magnetic domains. In the present paper, we uncover the atomic structure of the bulk and the surface of Mn 0.06 Sb 1.22 Bi 0.78 Te 3.06 in conjunction with its electronic and magnetic properties; this material is characterized by naturally formed ferromagnetic layers inside the insulating matrix, where the Fermi level is tuned to the bulk band gap. We found that in such mixed crystals septuple layers (SLs) of Mn(Bi,Sb) 2 Te 4 form structures that feature three SLs, each of which is separated by two or three (Bi,Sb) 2 Te 3 quintuple layers (QLs); such a structure possesses ferromagnetic properties. The surface obtained by cleavage includes terraces with different terminations. Manganese atoms preferentially occupy the central positions in the SLs and in a very small proportion can appear in the QLs, as indirectly indicated by a reshaped Dirac cone.
