Studies of magnetic structure of La1-xSrxMnO3 colossal magnetoresistive perovskites
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Date
2004-02-04
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Australian Institute of Physics
Abstract
This class of materials, based on the compound LaMnO3, continues to be the focus of attention because they exhibit colossal magnetoresistance (CMR) [1] which could lead to possible applications in magnetic recording and field sensors. In addition to the technological applications, the materials are important from a fundamental point of view due to the strong correlations between transport, structural and magnetic behaviour. The origin of the CMR effect has been attributed to the presence of magnetic polarons above the ferromagnetic ordering temperature, Tc. From recent research, using a combination of powder neutron diffraction, polarisation analysis and small-angle neutron scattering together with magnetic measurements, we present diffuse scattering, spin dynamics and lattice and magnetic correlations results for the La1-xSrxMnO3 (x=0.125 and 0.175) compounds. The diffuse scattering in the neutron diffraction patterns increases as the temperature approaches Tc from low temperature and continues to increase above Tc. The scattering peak in the forward direction above Tc
(Tc<T<1.6Tc) showed a Lorentzian-type q dependence. In the La0.875Sr0.125MnO3 sample the forward scattering peak has neutron spin-flip and non-spin-flip components indicating the presence of both lattice and magnetic type polarons above Tc.
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Keywords
Perovskites, Materials, Sensors, Crystal lattices, Neutron diffraction, Diffuse scattering, Spin, Spin flip
Citation
Finlayson, T. R., Wu, X., Ersez, T., & Schulz, J. C. (2004). Studies of magnetic structure of La1-xSrxMnO3 colossal magnetoresistive perovskites. Poster presented to the 28th Annual Condensed Matter and Materials Meeting, Charles Sturt University, Wagga Wagga, 3-6 February 2004. Retrieved from: https://www.physics.org.au/wp-content/uploads/cmm/2004/04handbook.pdf