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Paramagnetic Spin Correlations in Colossal Magnetoresistive La0.7Ca0.3MnO3

Published

Author(s)

Joel Helton, Matthew B. Stone, Dmitry A. Shulyatev, Yakov M. Mukovskii, Jeffrey W. Lynn

Abstract

Neutron spectroscopy measurements reveal dynamic spin correlations throughout the Brillouin zone in the colossal magnetoresistive system La0.7Ca0.3MnO3 at 265 K ({approx}1.03Tc). The long-wavelength behavior is consistent with spin diffusion, yet an additional and unexpected component of the scattering is also observed in low-energy constant-E measurements which takes the form of ridges of strong scattering running along (H 0 0) and equivalent directions. Well defined Q-space correlations are observed in constant-E scans at energies up to at least 28 meV, suggesting robust short-range correlations in the paramagnetic phase.
Citation
Physical Review B
Volume
85
Issue
14

Keywords

colossal magnetoresistance, paramagnetic scattering, isotropic ferromagnets, metallic ferromagnets

Citation

, J. , , M. , , D. , , Y. and Lynn, J. (2012), Paramagnetic Spin Correlations in Colossal Magnetoresistive La<sub>0.7</sub>Ca<sub>0.3</sub>MnO<sub>3</sub>, Physical Review B, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=910483 (Accessed June 25, 2024)

Issues

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Created April 2, 2012, Updated February 19, 2017