2012/02/29 by Joel S. Helton, M. B. Stone, Matthew B. Stone +6
Earth and Planetary Sciences · Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #High-pressure geophysics and materials #Magnetic and transport properties of perovskites and related materials #cond-mat.str-el
paper · pdf · doi:10.1103/physrevb.85.144401
published as Physical Review B 85, 144401 (2012) · v2: 5 pages, 5 figures. Figure added and text edited to match published version. v1: 5 pages, 4 figures
arxiv created 2012/04/02 · openalex publication_date 2012/04/02 · arxiv updated 2012/04/04 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
Neutron spectroscopy measurements reveal dynamic spin correlations throughout the Brillouin zone in the colossal magnetoresistive material La0.7Ca0.3MnO3 at 265 K (\ensuremath≈1.03 TC). 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 quasielastic 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 spin correlations in the paramagnetic phase.