@Article{HenriquesMGMCMAR:2014:ThDeEx,
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
(INPE)}",
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 610¼B, 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
gap.",
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 = "04 jun. 2024"
}