author = "Henriques, A. B. and Moraes, F. C. D. and Galgano, G. D. and 
                         Meaney, A. J. and Christianen, P. C. M. and Maan, J. C. and 
                         Abramof, Eduardo and Rappl, Paulo Henrique de Oliveira",
          affiliation = "{Universidade de S{\~a}o Paulo (USP)} and {Universidade de 
                         S{\~a}o Paulo (USP)} and {Universidade de S{\~a}o Paulo (USP)} 
                         and High Field Magnet Laboratory, Institute for Molecules and 
                         Materials, Radboud University NijmegenED Nijmegen, Netherlands and 
                         {Institute for Molecules and Materials} and {Institute for 
                         Molecules and Materials} and {Instituto Nacional de Pesquisas 
                         Espaciais (INPE)} and {Instituto Nacional de Pesquisas Espaciais 
                title = "Luminescence properties of magnetic polarons in EuTe: Theoretical 
                         description and experiments in magnetic fields up to 28 T",
              journal = "Physical Review B",
                 year = "2014",
               volume = "90",
               number = "16",
             abstract = "The recent discovery of a polaron-associated zero phonon line in 
                         the band-edge photoluminescence of high optical quality EuTe 
                         crystals opens up the prospect of answering long-standing 
                         questions about the polaron internal structure, thermal stability, 
                         and generation efficiency. Here, a Schr{\"o}dinger equation for 
                         the polaron was formulated and resolved by using both variational 
                         and self-consistent methods. The theory is in good agreement with 
                         measurements of the zero phonon line as a function of magnetic 
                         field and temperature, and it could be applied to other polaronic 
                         systems. It is deduced that, in EuTe, at 0K, a polaron carries a 
                         magnetic moment of 610B, and its binding energy is 27 meV. 
                         However, this binding energy does not carry the usual meaning of 
                         thermal stability, because it decreases drastically when the 
                         sample is warmed up. For instance, at T = 100K, the binding energy 
                         is already reduced to only 6 meV. The thermal destruction of a 
                         polaron is brought about by thermal fluctuations of the spin 
                         lattice that suppress the electron's self-energy. 
                         Photoluminescence excitation spectra of EuTe demonstrate that the 
                         photogeneration of polarons becomes increasingly inefficient when 
                         the energy of the pumping photon is increased above the band 
                  doi = "10.1103/PhysRevB.90.165202",
                  url = "http://dx.doi.org/10.1103/PhysRevB.90.165202",
                 issn = "1098-0121",
                label = "scopus 2014-11 HenriquesMGMCMAR:2014:ThDeEx",
             language = "en",
           targetfile = "Henriques_Luminescence.pdf",
        urlaccessdate = "28 nov. 2020"