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

Published

December 3, 2014

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 La_10zA_xMnO₃, 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.

Citation

Physical Review B

Volume

90

Issue

21

Pub Type

Journals

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Keywords

Colossal magnetoresistance, strongly correlated electrons, magnetism

Citation

, J. , , D. , Qiu, Y. , Zhao, Y. , , D. , , Y. , , G. , , S. and Lynn, J. (2014), Polaron-Mediated Spin Correlations in Metallic and Insulating La_1-xA_xMnO₃ (A=Ca,Sr, or Ba), Physical Review B, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=917127 (Accessed April 26, 2024)