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@Article{HenriquesGalgRappAbra:2016:LiPoMa,
               author = "Henriques, A. B. and Galgano, G. D. and Rappl, Paulo Henrique de 
                         Oliveira and Abramof, Eduardo",
          affiliation = "{Universidade de S{\~a}o Paulo (USP)} and {Universidade de 
                         S{\~a}o Paulo (USP)} and {Instituto Nacional de Pesquisas 
                         Espaciais (INPE)} and {Instituto Nacional de Pesquisas Espaciais 
                         (INPE)}",
                title = "Light-induced polaron magnetization in EuTe at temperatures 
                         reaching 150 K",
              journal = "Physical Review B: Condensed Matter and Materials Physics",
                 year = "2016",
               volume = "93",
               number = "20",
                pages = "201201",
                month = "May",
             abstract = "We demonstrate that light creates a highly magnetized region in a 
                         magnetic semiconductor far above its critical temperature. A 
                         near-gap photon generates a quasiparticle of nonzero magnetic 
                         moment, named magnetic polaron, which is constituted by the 
                         photoexcited electron and about 1000 spin-polarized lattice atoms 
                         surrounding the photoexcited electron. The photoinduced 
                         magnetization follows a Langevin function, whose shape uniquely 
                         determines the magnetic moment of an individual polaron. In EuTe 
                         at 5 K the magnetic moment reaches a giant value of over 500 Bohr 
                         magnetons, thus the photoinduced magnetization saturates with a 
                         magnetic field of only 50 mT, which characterizes the magnetic 
                         polaron system as superparamagnetic. The polaron has an average 
                         lifetime of 15\μs. When temperature is increased its 
                         magnetic moment decreases, but at 150 K it still has a large value 
                         of about 80 Bohr magnetons. The paramagnet of polarons is fully 
                         controlled by light. Because the magnetic polaron affects only 
                         spin orientation, but not the charge distribution, in the 
                         superparamagnetic state the ideal optical quality of the host 
                         semiconductor is preserved.",
                  doi = "10.1103/PhysRevB.93.201201",
                  url = "http://dx.doi.org/10.1103/PhysRevB.93.201201",
                 issn = "1098-0121",
             language = "en",
        urlaccessdate = "01 dez. 2020"
}


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