Phonons Reflect Dynamic Spin-State Order in LaCoO 3
Physical Review Letters, vol. 137, pp. 116101
Abstract
We investigate lattice dynamics in LaCoO_{3} using inelastic neutron and x-ray scattering over T=2-650 K, spanning the spin-state crossover at T_{1}≈100 K and the insulator-metal transition at T_{2}≈550 K. Comparison with quasiharmonic ab initio lattice-dynamical calculations helps reveal anomalous softening of a≈10-meV oxygen phonon, confined to the temperature interval T_{1}≤T≤T_{2} and localized in momentum space at q_{SSO}=(½,½,½)_{c}. This wave vector is characteristic of the spin-state-ordering pattern originally proposed by Goodenough [An interpretation of the magnetic properties of the perovskite-type mixed crystals La_{1-x}Sr_{x}CoO_{3-λ}, J. Phys. Chem. Solids 6, 287 (1958)JPCSAW0022-369710.1016/0022-3697(58)90107-0]. Our results provide momentum-resolved evidence for dynamic correlations of high-spin and low-spin Co^{3+} states characterized by q_{SSO}=(½,½,½)_{c}, demonstrating that phonons are sensitive probes of fluctuating spin-state correlations in LaCoO_{3}.
Authors 20
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Karlsruhe Institute of Technology
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Karlsruhe Institute of Technology
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Affiliation as printed
Materials Dynamics Laboratory
Precision Spectroscopy Division
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Karlsruhe Institute of Technology
Affiliation as printed
Karlsruhe Institute of Technology
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Karlsruhe Institute of Technology
Affiliation as printed
Karlsruhe Institute of Technology
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Karlsruhe Institute of Technology
Affiliation as printed
Karlsruhe Institute of Technology
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Karlsruhe Institute of Technology
Affiliation as printed
Karlsruhe Institute of Technology
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Karlsruhe Institute of Technology
Affiliation as printed
Karlsruhe Institute of Technology
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Karlsruhe Institute of Technology
Affiliation as printed
Karlsruhe Institute of Technology
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Karlsruhe Institute of Technology
Affiliation as printed
Karlsruhe Institute of Technology
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Karlsruhe Institute of Technology · Centre National de la Recherche Scientifique · Commissariat à l'Énergie Atomique et aux Énergies Alternatives · CEA Paris-Saclay - Etablissement de Saclay · Laboratoire Léon Brillouin · CEA Paris-Saclay
Affiliation as printed
CEA Saclay
Karlsruhe Institute of Technology
Laboratoire Léon Brillouin (CEA-CNRS)
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Affiliation as printed
Institut Laue-Langevin
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Argonne National Laboratory
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Argonne National Laboratory
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Affiliation as printed
Argonne National Laboratory
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Martin Meven Aachen
Forschungszentrum Jülich · Heinz Maier-Leibnitz Zentrum · RWTH Aachen University
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Forschungszentrum Jülich GmbH at Heinz Maier-Leibnitz Zentrum (MLZ)
RWTH Aachen University
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Affiliation as printed
Heinz Maier-Leibnitz Zentrum (MLZ)
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Affiliation as printed
Materials Dynamics Laboratory
Precision Spectroscopy Division
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SPring-8 · Japan Synchrotron Radiation Research Institute
Affiliation as printed
JASRI
SPring-8
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Affiliation as printed
Materials Dynamics Laboratory
Precision Spectroscopy Division
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Karlsruhe Institute of Technology
Affiliation as printed
Karlsruhe Institute of Technology
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