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

Research output: Contribution to journal › Article › peer-review

9 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

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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.\}",

note = "Publisher Copyright: {\textcopyright} 2014 American Physical Society.",

year = "2014",

month = dec,

day = "3",

doi = "10.1103/PhysRevB.90.214411",

language = "English",

volume = "90",

journal = "Physical Review B - Condensed Matter and Materials Physics",

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TY - JOUR

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.

UR - https://www.scopus.com/pages/publications/84916219106

U2 - 10.1103/PhysRevB.90.214411

DO - 10.1103/PhysRevB.90.214411

M3 - Article

AN - SCOPUS:84916219106

SN - 1098-0121

VL - 90

JO - Physical Review B - Condensed Matter and Materials Physics

JF - Physical Review B - Condensed Matter and Materials Physics

IS - 21

M1 - 214411

ER -

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

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