Abstract
La0.7Ca0.3MnO3 (LCMO30) is a perovskite manganite with a phase transition (TC = 238 K) between a paramagnetic insulator and a ferromagnetic metal. We use single-crystal, inelastic neutron scattering to refine previous work on the low energy (ℏω < 10 meV) magnetic excitations. At 300 K the spectrum consists of a diffusive ferromagnetic component at the pseudo-cubic Brillouin zone center coexisting with a quasielastic excitation located at the pseudo-cubic Brillouin zone edge. Both components are anti-correlated with ferromagnetic long-range order, showing weakened intensity at 215 K in the ferromagnetic phase. Polarized neutron scattering shows both features to be purely magnetic in origin. This indicates the simultaneous presence of ferromagnetic and antiferromagnetic correlations (located, respectively, at the zone center and zone edge) in a three-dimensional perovskite, while this coexistence had been previously observed only in a bilayer compound.
| Original language | English |
|---|---|
| Article number | 169740 |
| Journal | Journal of Magnetism and Magnetic Materials |
| Volume | 561 |
| DOIs | |
| State | Published - Nov 1 2022 |
Funding
The work at Oak Ridge National Laboratory's Spallation Neutron Source was supported by the United States Department of Energy (US-DOE), Office of Science - Basic Energy Science (BES), Scientific User Facilities Division. DMP is grateful to D. K. Pratt and J. A. Fernandez-Baca for useful discussions, and to J. A. Fernandez-Baca for permission to use the LCMO30 crystal. This manuscript has been authored by UT-Battelle, LLC under Contract No. DE-AC05-00OR22725 with the U.S. Department of Energy. The United States Government retains and the publisher, by accepting the article for publication, acknowledges that the United States Government retains a non-exclusive, paid-up, irrevocable, world-wide license to publish or reproduce the published form of this manuscript, or allow others to do so, for United States Government purposes. The Department of Energy will provide public access to these results of federally sponsored research in accordance with the DOE Public Access Plan [Ref xx: http://energy.gov/downloads/doe-public-access-plan]. This manuscript has been authored by UT-Battelle, LLC under Contract No. DE-AC05-00OR22725 with the U.S. Department of Energy. The United States Government retains and the publisher, by accepting the article for publication, acknowledges that the United States Government retains a non-exclusive, paid-up, irrevocable, world-wide license to publish or reproduce the published form of this manuscript, or allow others to do so, for United States Government purposes. The Department of Energy will provide public access to these results of federally sponsored research in accordance with the DOE Public Access Plan [Ref xx: http://energy.gov/downloads/doe-public-access-plan ]. The work at Oak Ridge National Laboratory’s Spallation Neutron Source was supported by the United States Department of Energy (US-DOE), Office of Science - Basic Energy Science (BES), Scientific User Facilities Division. DMP is grateful to D. K. Pratt and J. A. Fernandez-Baca for useful discussions, and to J. A. Fernandez-Baca for permission to use the LCMO30 crystal.