Softening and broadening of the zone boundary magnons in Pr0.63Sr0.37MnO3

H. Y. Hwang; P. Dai; S. W. Cheong; G. Aeppli; D. A. Tennant; H. A. Mook

doi:10.1103/PhysRevLett.80.1316

Softening and broadening of the zone boundary magnons in Pr_0.63Sr_0.37MnO₃

H. Y. Hwang, P. Dai, S. W. Cheong, G. Aeppli, D. A. Tennant, H. A. Mook

School of Arts and Sciences, Physics & Astronomy

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

125 Scopus citations

Abstract

We have studied the spin dynamics in Pr_0.63Sr_0.37MnO₃ above and below the Curie temperature T_C = 301 K. Three distinct new features have been observed: a softening of the magnon dispersion at the zone boundary for T < T_C, significant broadening of the zone boundary magnons as T → T_C, and no evidence for residual spin-wave-like excitations just above T_C. The results are inconsistent with double exchange models that have been successfully applied to higher T_C samples, indicating an evolution of the spin system with decreasing T_C.

Original language	English (US)
Pages (from-to)	1316-1319
Number of pages	4
Journal	Physical review letters
Volume	80
Issue number	6
DOIs	https://doi.org/10.1103/PhysRevLett.80.1316
State	Published - 1998

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Physics and Astronomy(all)

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10.1103/PhysRevLett.80.1316

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title = "Softening and broadening of the zone boundary magnons in Pr0.63Sr0.37MnO3",

abstract = "We have studied the spin dynamics in Pr0.63Sr0.37MnO3 above and below the Curie temperature TC = 301 K. Three distinct new features have been observed: a softening of the magnon dispersion at the zone boundary for T < TC, significant broadening of the zone boundary magnons as T → TC, and no evidence for residual spin-wave-like excitations just above TC. The results are inconsistent with double exchange models that have been successfully applied to higher TC samples, indicating an evolution of the spin system with decreasing TC.",

author = "Hwang, {H. Y.} and P. Dai and Cheong, {S. W.} and G. Aeppli and Tennant, {D. A.} and Mook, {H. A.}",

year = "1998",

doi = "10.1103/PhysRevLett.80.1316",

language = "English (US)",

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TY - JOUR

T1 - Softening and broadening of the zone boundary magnons in Pr0.63Sr0.37MnO3

AU - Hwang, H. Y.

AU - Dai, P.

AU - Cheong, S. W.

AU - Aeppli, G.

AU - Tennant, D. A.

AU - Mook, H. A.

PY - 1998

Y1 - 1998

N2 - We have studied the spin dynamics in Pr0.63Sr0.37MnO3 above and below the Curie temperature TC = 301 K. Three distinct new features have been observed: a softening of the magnon dispersion at the zone boundary for T < TC, significant broadening of the zone boundary magnons as T → TC, and no evidence for residual spin-wave-like excitations just above TC. The results are inconsistent with double exchange models that have been successfully applied to higher TC samples, indicating an evolution of the spin system with decreasing TC.

AB - We have studied the spin dynamics in Pr0.63Sr0.37MnO3 above and below the Curie temperature TC = 301 K. Three distinct new features have been observed: a softening of the magnon dispersion at the zone boundary for T < TC, significant broadening of the zone boundary magnons as T → TC, and no evidence for residual spin-wave-like excitations just above TC. The results are inconsistent with double exchange models that have been successfully applied to higher TC samples, indicating an evolution of the spin system with decreasing TC.

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U2 - 10.1103/PhysRevLett.80.1316

DO - 10.1103/PhysRevLett.80.1316

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VL - 80

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EP - 1319

JO - Physical Review Letters

JF - Physical Review Letters

IS - 6

ER -

Softening and broadening of the zone boundary magnons in Pr_0.63Sr_0.37MnO₃

Abstract

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