@Article{TcakaevZRPSDKWSBRABGRH:2020:InAnEu,
               author = "Tcakaev, A. and Zabolotnyy, V. B. and Fornari and I and C. and 
                         Ruessmann, P. and Peixoto, T. R. F. and Stier, F. and Dettbarn, M. 
                         and Kagerer, P. and Weschke, E. and Schierle, E. and Bencok, P. 
                         and Rappl, Paulo Henrique de Oliveira and Abramof, Eduardo and 
                         Bentmann, H. and Goering, E. and Reinert, F. and Hinkov, V",
          affiliation = "{Universit{\"a}t W{\"u}rzburg} and {Universit{\"a}t 
                         W{\"u}rzburg} and {Universit{\"a}t W{\"u}rzburg} and {Peter 
                         Gr{\"u}nberg Institut and Institute for Advanced Simulation} and 
                         {Universit{\"a}t W{\"u}rzburg} and {Universit{\"a}t 
                         W{\"u}rzburg} and {Universit{\"a}t W{\"u}rzburg} and 
                         {Universit{\"a}t W{\"u}rzburg} and {Helmholtz-Zentrum Berlin 
                         f{\"u}r Materialien und Energie} and {Helmholtz-Zentrum Berlin 
                         f{\"u}r Materialien und Energie} and {Diamond Light Source} and 
                         {Instituto Nacional de Pesquisas Espaciais (INPE)} and {Instituto 
                         Nacional de Pesquisas Espaciais (INPE)} and {Universit{\"a}t 
                         W{\"u}rzburg} and {Max-Planck-Institute for Intelligent Systems} 
                         and {Universit{\"a}t W{\"u}rzburg} and {Universit{\"a}t 
                         W{\"u}rzburg}",
                title = "Incipient antiferromagnetism in the Eu-doped topological insulator 
                         Bi2Te3",
              journal = "Physical Review B",
                 year = "2020",
               volume = "102",
               number = "18",
                month = "Nov.",
             abstract = "Rare-earth ions typically exhibit larger magnetic moments than 
                         transition-metal ions and thus promise the opening of a wider 
                         exchange gap in the Dirac surface states of topological 
                         insulators. Yet in a recent photoemission study of Eu-doped Bi2Te3 
                         films, the spectra remained gapless down to T = 20 K. Here we 
                         scrutinize whether the conditions for a substantial gap formation 
                         in this system are present by combining spectroscopic and bulk 
                         characterization methods with theoretical calculations. For all 
                         studied Eu doping concentrations, our atomic multiplet analysis of 
                         the M-4,M-5 x-ray absorption and magnetic circular dichroism 
                         spectra reveals a Eu2+ valence and confirms a large magnetic 
                         moment, consistent with a 4f(7) S-8(7/2) ground state. At 
                         temperatures below 10 K, bulk magnetometry indicates the onset of 
                         antiferromagnetic (AFM) ordering. This is in good agreement with 
                         density functional theory, which predicts AFM interactions between 
                         the Eu impurities. Our results support the notion that 
                         antiferromagnetism can coexist with topological surface states in 
                         rare-earth-doped Bi2Te3 and call for spectroscopic studies in the 
                         Kelvin range to look for novel quantum phenomena such as the 
                         quantum anomalous Hall effect.",
                  doi = "10.1103/PhysRevB.102.184401",
                  url = "http://dx.doi.org/10.1103/PhysRevB.102.184401",
                 issn = "1098-0121",
                label = "isi 2020-11-16 TcakaevZRPSDKWSBRABGRH:2020:InAnEu",
             language = "en",
           targetfile = "Incipient antiferromagnetism in the Eu-doped topological insulator 
                         \${_rm Bi}_2{_rm Te}_3\$.pdf",
        urlaccessdate = "27 abr. 2024"
}