Spin waves and other magnetic fluctuations in giant magnetoresistive perovskite manganites

T. G. Perring; G. Aeppli; S. M. Hayden; Y. Moritomo; Y. Tokura; J. P. Remeika; S. W. Cheong

doi:10.1016/S0921-4526(96)01104-0

Spin waves and other magnetic fluctuations in giant magnetoresistive perovskite manganites

T. G. Perring, G. Aeppli, S. M. Hayden, Y. Moritomo, Y. Tokura, J. P. Remeika, S. W. Cheong

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

2 Scopus citations

Abstract

We have used inelastic neutron scattering to measure the spin wave dispersion throughout the Brillouin zone of the double exchange ferromagnet La_0.7Pb_0.3MnO₃. The dispersion is well described by that for the double exchange Hamiltonian. The Curie temperature calculated for a local moment ferromagnet with the observed dispersion agrees with experiment within 15%. In the paramagnetic phase of the two-dimensional analogue La_1.2Sr_1.8Mn₂O₇, we have observed long-lived antiferromagnetic clusters coexisting with ferromagnetic fluctuations. This effect must be included in theories that attempt to explain giant magnetoresistance in manganites, at least in two dimensions.

Original language	English (US)
Pages (from-to)	698-702
Number of pages	5
Journal	Physica B: Condensed Matter
Volume	234-236
DOIs	https://doi.org/10.1016/S0921-4526(96)01104-0
State	Published - Jun 2 1997
Externally published	Yes

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Electrical and Electronic Engineering

Keywords

Critical scattering
Magnetoresistance
Perovskite compounds
Spin waves

Access to Document

10.1016/S0921-4526(96)01104-0

Cite this

@article{4f5772bea7944c258c0646940c2604ca,

title = "Spin waves and other magnetic fluctuations in giant magnetoresistive perovskite manganites",

abstract = "We have used inelastic neutron scattering to measure the spin wave dispersion throughout the Brillouin zone of the double exchange ferromagnet La0.7Pb0.3MnO3. The dispersion is well described by that for the double exchange Hamiltonian. The Curie temperature calculated for a local moment ferromagnet with the observed dispersion agrees with experiment within 15%. In the paramagnetic phase of the two-dimensional analogue La1.2Sr1.8Mn2O7, we have observed long-lived antiferromagnetic clusters coexisting with ferromagnetic fluctuations. This effect must be included in theories that attempt to explain giant magnetoresistance in manganites, at least in two dimensions.",

keywords = "Critical scattering, Magnetoresistance, Perovskite compounds, Spin waves",

author = "Perring, {T. G.} and G. Aeppli and Hayden, {S. M.} and Y. Moritomo and Y. Tokura and Remeika, {J. P.} and Cheong, {S. W.}",

year = "1997",

month = jun,

day = "2",

doi = "10.1016/S0921-4526(96)01104-0",

language = "English (US)",

volume = "234-236",

pages = "698--702",

journal = "Physica B: Condensed Matter",

issn = "0921-4526",

publisher = "Elsevier",

}

TY - JOUR

T1 - Spin waves and other magnetic fluctuations in giant magnetoresistive perovskite manganites

AU - Perring, T. G.

AU - Aeppli, G.

AU - Hayden, S. M.

AU - Moritomo, Y.

AU - Tokura, Y.

AU - Remeika, J. P.

AU - Cheong, S. W.

PY - 1997/6/2

Y1 - 1997/6/2

N2 - We have used inelastic neutron scattering to measure the spin wave dispersion throughout the Brillouin zone of the double exchange ferromagnet La0.7Pb0.3MnO3. The dispersion is well described by that for the double exchange Hamiltonian. The Curie temperature calculated for a local moment ferromagnet with the observed dispersion agrees with experiment within 15%. In the paramagnetic phase of the two-dimensional analogue La1.2Sr1.8Mn2O7, we have observed long-lived antiferromagnetic clusters coexisting with ferromagnetic fluctuations. This effect must be included in theories that attempt to explain giant magnetoresistance in manganites, at least in two dimensions.

AB - We have used inelastic neutron scattering to measure the spin wave dispersion throughout the Brillouin zone of the double exchange ferromagnet La0.7Pb0.3MnO3. The dispersion is well described by that for the double exchange Hamiltonian. The Curie temperature calculated for a local moment ferromagnet with the observed dispersion agrees with experiment within 15%. In the paramagnetic phase of the two-dimensional analogue La1.2Sr1.8Mn2O7, we have observed long-lived antiferromagnetic clusters coexisting with ferromagnetic fluctuations. This effect must be included in theories that attempt to explain giant magnetoresistance in manganites, at least in two dimensions.

KW - Critical scattering

KW - Magnetoresistance

KW - Perovskite compounds

KW - Spin waves

UR - http://www.scopus.com/inward/record.url?scp=17744401407&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=17744401407&partnerID=8YFLogxK

U2 - 10.1016/S0921-4526(96)01104-0

DO - 10.1016/S0921-4526(96)01104-0

M3 - Article

AN - SCOPUS:17744401407

SN - 0921-4526

VL - 234-236

SP - 698

EP - 702

JO - Physica B: Condensed Matter

JF - Physica B: Condensed Matter

ER -

Spin waves and other magnetic fluctuations in giant magnetoresistive perovskite manganites

Abstract

All Science Journal Classification (ASJC) codes

Keywords

Access to Document

Other files and links

Fingerprint

Cite this