Magnetic dynamics in colossal magnetoresistive perovskite manganites

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

doi:10.1098/rsta.1998.0235

Magnetic dynamics in colossal magnetoresistive perovskite manganites

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

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

Abstract

We have measured the spin-wave dispersion throughout the Brillouin zone of the double-exchange ferromagnet La_0.7Pb_0.3MnO₃ by using inelastic neutron scattering. An unexpectedly simple Heisenberg Hamiltonian with solely a nearest-neighbour coupling accounts for the entire dispersion relation. The value of the Curie temperature T_C calculated from the derived coupling constant agrees with the experimental value to within 15%. The results, including damping of the zone boundary spin waves near T_C, can be fully understood in the framework of the double-exchange Hamiltonian. 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)	1563-1575
Number of pages	13
Journal	Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences
Volume	356
Issue number	1742
DOIs	https://doi.org/10.1098/rsta.1998.0235
State	Published - Jul 15 1998
Externally published	Yes

All Science Journal Classification (ASJC) codes

Mathematics(all)
Engineering(all)
Physics and Astronomy(all)

Keywords

Antiferromagnetic fluctuations
Critical magnetic scattering
Heisenberg Hamiltonian
Spin waves

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10.1098/rsta.1998.0235

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title = "Magnetic dynamics in colossal magnetoresistive perovskite manganites",

abstract = "We have measured the spin-wave dispersion throughout the Brillouin zone of the double-exchange ferromagnet La0.7Pb0.3MnO3 by using inelastic neutron scattering. An unexpectedly simple Heisenberg Hamiltonian with solely a nearest-neighbour coupling accounts for the entire dispersion relation. The value of the Curie temperature TC calculated from the derived coupling constant agrees with the experimental value to within 15%. The results, including damping of the zone boundary spin waves near TC, can be fully understood in the framework of the double-exchange Hamiltonian. 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 = "Antiferromagnetic fluctuations, Critical magnetic scattering, Heisenberg Hamiltonian, Spin waves",

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

year = "1998",

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doi = "10.1098/rsta.1998.0235",

language = "English (US)",

volume = "356",

pages = "1563--1575",

journal = "Philosophical transactions. Series A, Mathematical, physical, and engineering sciences",

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TY - JOUR

T1 - Magnetic dynamics in colossal magnetoresistive perovskite manganites

AU - Peering, T. G.

AU - Aeppli, G.

AU - Hayden, S. M.

AU - Tokura, Y.

AU - Moritomo, Y.

AU - Remeika, J. P.

AU - Cheong, S. W.

PY - 1998/7/15

Y1 - 1998/7/15

N2 - We have measured the spin-wave dispersion throughout the Brillouin zone of the double-exchange ferromagnet La0.7Pb0.3MnO3 by using inelastic neutron scattering. An unexpectedly simple Heisenberg Hamiltonian with solely a nearest-neighbour coupling accounts for the entire dispersion relation. The value of the Curie temperature TC calculated from the derived coupling constant agrees with the experimental value to within 15%. The results, including damping of the zone boundary spin waves near TC, can be fully understood in the framework of the double-exchange Hamiltonian. 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 measured the spin-wave dispersion throughout the Brillouin zone of the double-exchange ferromagnet La0.7Pb0.3MnO3 by using inelastic neutron scattering. An unexpectedly simple Heisenberg Hamiltonian with solely a nearest-neighbour coupling accounts for the entire dispersion relation. The value of the Curie temperature TC calculated from the derived coupling constant agrees with the experimental value to within 15%. The results, including damping of the zone boundary spin waves near TC, can be fully understood in the framework of the double-exchange Hamiltonian. 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 - Antiferromagnetic fluctuations

KW - Critical magnetic scattering

KW - Heisenberg Hamiltonian

KW - Spin waves

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JO - Philosophical transactions. Series A, Mathematical, physical, and engineering sciences

JF - Philosophical transactions. Series A, Mathematical, physical, and engineering sciences

IS - 1742

ER -

Magnetic dynamics in colossal magnetoresistive perovskite manganites

Abstract

All Science Journal Classification (ASJC) codes

Keywords

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