Polaron-mediated spin correlations in metallic and insulating La1-xAx MnO3 (A=Ca,Sr,orBa)

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

doi:10.1103/PhysRevB.90.214411

Polaron-mediated spin correlations in metallic and insulating La1-xAx MnO3 (A=Ca,Sr,orBa)

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

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8 Scopus citations

Abstract

Neutron spectroscopy measurements reveal short-range spin correlations near and above the ferromagnetic-paramagnetic phase transition in manganite materials of the form La1-xAxMnO3, 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.

Original language	English
Article number	214411
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	90
Issue number	21
DOIs	https://doi.org/10.1103/PhysRevB.90.214411
State	Published - Dec 3 2014
Externally published	Yes

Bibliographical note

Publisher Copyright:
© 2014 American Physical Society.

Funding

Funders	Funder number
National Science Foundation	DMR-0944772
National Science Foundation
Directorate for Mathematical and Physical Sciences	0944772

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10.1103/PhysRevB.90.214411

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title = "Polaron-mediated spin correlations in metallic and insulating La1-xAx MnO3 (A=Ca,Sr,orBa)",

abstract = "Neutron spectroscopy measurements reveal short-range spin correlations near and above the ferromagnetic-paramagnetic phase transition in manganite materials of the form La1-xAxMnO3, 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.",

author = "Helton, {Joel S.} and Pajerowski, {Daniel M.} and Yiming Qiu and Yang Zhao and Shulyatev, {Dmitry A.} and Mukovskii, {Yakov M.} and Bychkov, {Georgii L.} and Barilo, {Sergei N.} and Lynn, {Jeffrey W.}",

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year = "2014",

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doi = "10.1103/PhysRevB.90.214411",

language = "English",

volume = "90",

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T1 - Polaron-mediated spin correlations in metallic and insulating La1-xAx MnO3 (A=Ca,Sr,orBa)

AU - Helton, Joel S.

AU - Pajerowski, Daniel M.

AU - Qiu, Yiming

AU - Zhao, Yang

AU - Shulyatev, Dmitry A.

AU - Mukovskii, Yakov M.

AU - Bychkov, Georgii L.

AU - Barilo, Sergei N.

AU - Lynn, Jeffrey W.

PY - 2014/12/3

Y1 - 2014/12/3

N2 - Neutron spectroscopy measurements reveal short-range spin correlations near and above the ferromagnetic-paramagnetic phase transition in manganite materials of the form La1-xAxMnO3, 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.

AB - Neutron spectroscopy measurements reveal short-range spin correlations near and above the ferromagnetic-paramagnetic phase transition in manganite materials of the form La1-xAxMnO3, 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.

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DO - 10.1103/PhysRevB.90.214411

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JO - Physical Review B - Condensed Matter and Materials Physics

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IS - 21

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Polaron-mediated spin correlations in metallic and insulating La1-xAx MnO3 (A=Ca,Sr,orBa)

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