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Polaron-Mediated Spin Correlations in Metallic and Insulating La1-xAxMnO3 (A=Ca,Sr, or Ba)
Published
Author(s)
Joel Helton, Daniel M Pajerowski, Yiming Qiu, Yang Zhao, Dmitry A. Shulyatev, Yakov M. Mukovskii, Georgii L. Bychkov, Sergei N. Barilo, Jeffrey W. Lynn
Abstract
Neutron spectroscopy measurements reveal short-range spin correlations near and above the ferromagnetic-paramagnetic phase transition in manganite materials of the form La10zAxMnO3, including samples with an insulating ground state as well as colossal magnetoresistive samples with a metallic ground state. Quasielastic magnetic scattering is revealed that forms clear ridges running along the [100}-type directions in momentum space. A simple model consisting of a conduction electron hopping between spin polarized Mn ions that becomes self-trapped after a few hops captures the essential physics of this magnetic component of the scattering. We associate this scattering component with the magnetic part of diffuse polarons, as we observe a temperature dependence similar to that of the diffuse structural scattering arising from individual polarons.
, J.
, , D.
, Qiu, Y.
, Zhao, Y.
, , D.
, , Y.
, , G.
, , S.
and Lynn, J.
(2014),
Polaron-Mediated Spin Correlations in Metallic and Insulating La<sub>1-x</sub>A<sub>x</sub>MnO<sub>3</sub> (A=Ca,Sr, or Ba), Physical Review B, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=917127
(Accessed October 2, 2025)