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Polaron-Mediated Spin Correlations in Metallic and Insulating La1-xAxMnO3 (A=Ca,Sr, or Ba)



Joel Helton, Daniel M Pajerowski, Yiming Qiu, Yang Zhao, Dmitry A. Shulyatev, Yakov M. Mukovskii, Georgii L. Bychkov, Sergei N. Barilo, Jeffrey W. Lynn


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.
Physical Review B


Colossal magnetoresistance, strongly correlated electrons, magnetism


, 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], (Accessed May 26, 2024)


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Created December 3, 2014, Updated February 19, 2017