Spin waves throughout the Brillouin zone and magnetic exchange coupling in the ferromagnetic metallic manganites La1−xCaxMnO3 (x=0.25, 0.30)

Ye, Feng; Dai, Pengcheng; Fernandez-Baca, Jaime A; Adroja, D. T.; Perring, T. G.; Tomioka, Y.; Tokura, Y.

doi:10.1103/PhysRevB.75.144408

Title: Spin waves throughout the Brillouin zone and magnetic exchange coupling in the ferromagnetic metallic manganites La_1−xCa_xMnO₃ (x=0.25, 0.30)

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Abstract

Using time-of-flight and triple-axis inelastic neutron spectroscopy, we determine spin-wave excitations throughout the Brillouin zone for ferromagnetic manganites La1−xCaxMnO3 (x=0.25, 0.3) in their lowtemperature metallic states. While spin-wave excitations in the long-wavelength limit spin stiffness D have similar values for both compounds, the excitations near the Brillouin-zone boundary of La0.7Ca0.3MnO3 are considerably softened in all symmetry directions compared to that of La0.75Ca0.25MnO3. A Heisenberg model with the nearest neighbor and the fourth neighbor exchange interactions can describe the overall dispersion curves fairly well. We compare the data with various theoretical models describing the spin excitations of ferromagnetic manganites.

Authors:

Ye, Feng ^[1]; Dai, Pengcheng ^[1]; Fernandez-Baca, Jaime A ^[1]; Adroja, D. T. ^[2]; Perring, T. G. ^[2]; Tomioka, Y. ^[3]; Tokura, Y. ^[4]

ORNL
ISIS Facility, Rutherford Appleton Laboratory
Correlated Electron Research Center (CERC), Japan
University of Tokyo, Tokyo, Japan

Publication Date:: Mon Jan 01 00:00:00 EST 2007

Research Org.:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). High Flux Isotope Reactor (HFIR)

Sponsoring Org.:: USDOE Office of Science (SC)

OSTI Identifier:: 931582

DOE Contract Number:: DE-AC05-00OR22725

Resource Type:: Journal Article

Journal Name:: Physical Review B

Additional Journal Information:: Journal Volume: 75; Journal ID: ISSN 0163-1829

Country of Publication:: United States

Language:: English

Subject:: 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; BRILLOUIN ZONES; EXCHANGE INTERACTIONS; FLEXIBILITY; HEISENBERG MODEL; NEUTRON SPECTROSCOPY; SPIN; SPIN WAVES; SYMMETRY; spin wave; CMR manganite

Citation Formats


                    Ye, Feng, Dai, Pengcheng, Fernandez-Baca, Jaime A, Adroja, D. T., Perring, T. G., Tomioka, Y., and Tokura, Y. Spin waves throughout the Brillouin zone and magnetic exchange coupling in the ferromagnetic metallic manganites La1−xCaxMnO3 (x=0.25, 0.30).  United States: N. p., 2007. 
        Web.  doi:10.1103/PhysRevB.75.144408.

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                    Ye, Feng, Dai, Pengcheng, Fernandez-Baca, Jaime A, Adroja, D. T., Perring, T. G., Tomioka, Y., & Tokura, Y. Spin waves throughout the Brillouin zone and magnetic exchange coupling in the ferromagnetic metallic manganites La1−xCaxMnO3 (x=0.25, 0.30).  United States.  https://doi.org/10.1103/PhysRevB.75.144408

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                    Ye, Feng, Dai, Pengcheng, Fernandez-Baca, Jaime A, Adroja, D. T., Perring, T. G., Tomioka, Y., and Tokura, Y. 2007.  
        "Spin waves throughout the Brillouin zone and magnetic exchange coupling in the ferromagnetic metallic manganites La1−xCaxMnO3 (x=0.25, 0.30)".  United States.  https://doi.org/10.1103/PhysRevB.75.144408.

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@article{osti_931582,

  title        = {Spin waves throughout the Brillouin zone and magnetic exchange coupling in the ferromagnetic metallic manganites La1−xCaxMnO3 (x=0.25, 0.30)},

  author       = {Ye, Feng and Dai, Pengcheng and Fernandez-Baca, Jaime A and Adroja, D. T. and Perring, T. G. and Tomioka, Y. and Tokura, Y.},

  abstractNote = {Using time-of-flight and triple-axis inelastic neutron spectroscopy, we determine spin-wave excitations throughout the Brillouin zone for ferromagnetic manganites La1−xCaxMnO3 (x=0.25, 0.3) in their lowtemperature metallic states. While spin-wave excitations in the long-wavelength limit spin stiffness D have similar values for both compounds, the excitations near the Brillouin-zone boundary of La0.7Ca0.3MnO3 are considerably softened in all symmetry directions compared to that of La0.75Ca0.25MnO3. A Heisenberg model with the nearest neighbor and the fourth neighbor exchange interactions can describe the overall dispersion curves fairly well. We compare the data with various theoretical models describing the spin excitations of ferromagnetic manganites.},

  doi          = {10.1103/PhysRevB.75.144408},

  url          = {https://www.osti.gov/biblio/931582},
  journal      = {Physical Review B},

  issn         = {0163-1829},

  number       = ,

  volume       = 75,

  place        = {United States},

  year         = {Mon Jan 01 00:00:00 EST 2007},

  month        = {Mon Jan 01 00:00:00 EST 2007}

}

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Title: Spin waves throughout the Brillouin zone and magnetic exchange coupling in the ferromagnetic metallic manganites La1−xCaxMnO3 (x=0.25, 0.30)

Abstract

Citation Formats

Title: Spin waves throughout the Brillouin zone and magnetic exchange coupling in the ferromagnetic metallic manganites La_1−xCa_xMnO₃ (x=0.25, 0.30)