Polarised neutron scattering study of magnetic correlations and spin dynamics in La0.875Sr0.125MnO3+δ

被引：0
|
作者：
T. Ersez
S.J. Kennedy
T.R. Finlayson
机构：
[1] Neutron Scattering Group,
[2] Physics Division,undefined
[3] ANSTO,undefined
[4] PMB 1,undefined
[5] Menai,undefined
[6] NSW 2234,undefined
[7] Australia,undefined
[8] School of Physics and Materials Engineering,undefined
[9] P.O. Box 27,undefined
[10] Monash University,undefined
[11] Clayton,undefined
[12] VIC 3800,undefined
[13] Australia,undefined
来源：
Applied Physics A | 2002年 / 74卷
关键词：
PACS: 75.25.+z; 75.30.Kz; 75.30.Vn; 75.40.-s; 75.40.Gb;
D O I：
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摘要：
The rhombohedral La0.875Sr0.125MnO3+δ compound exhibits colossal magnetoresistance in the vicinity of the ferromagnetic transition, Tc (∼250 K). From neutron polarisation analysis measurements, the scattering peak in the forward direction above Tc (Tc>T>1.6Tc), showed a Lorentzian-type q dependence, with magnetic correlation lengths (Ornstein–Zernike form) in the range 11–14 Å. This forward scattering peak has both neutron spin-flip and non-spin-flip components and our measurements demonstrate that we have simultaneously observed the lattice and magnetic components of polarons above Tc. From the energy scale of the observed diffusive fluctuation in this compound, the polarons were determined to have a mobility of ∼2.5×10-11 cm2 s-1at room temperature.
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页码：s725 / s727
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