Magnetic spectra in the tridiminished-icosahedron {Fe9} nanocluster by inelastic neutron scattering

Vaknin, David; Demmel, Franz

doi:10.1103/PhysRevB.89.180411

Title: Magnetic spectra in the tridiminished-icosahedron {Fe9} nanocluster by inelastic neutron scattering

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Abstract

Inelastic neutron scattering (INS) experiments under applied magnetic field at low temperatures show detailed low-lying magnetic excitations in the so-called tridiminshed iron icosahedron magnetic molecule. The magnetic molecule consists of nine iron Fe3+ (s=5/2) and three phosphorous atoms that are situated on the 12 vertices of a nearly perfect icosahedron. The three phosphorous atoms form a plane that separates the iron cluster into two weakly coupled three- and six-ion fragments, {Fe3} and {Fe6}, respectively. The magnetic field INS results exhibit an S=1/2 ground state expected from a perfect equilateral triangle of the {Fe3} triad with a powder averaged g value =2.00. Two sets of triplet excitations whose temperature and magnetic field dependence indicate an S=0 ground state with two nondegenerate S=1 states are attributed to the {Fe6} fragment. The splitting may result from a finite coupling between the two fragments, single-ion anisotropy, antisymmetric exchange couplings, or from magnetic frustration of its triangular building blocks.

Authors:

Vaknin, David ^[1]; Demmel, Franz ^[2]

Ames Laboratory
Rutherford Appleton Laboratory

Publication Date:: Thu May 01 00:00:00 EDT 2014

Research Org.:: Ames Lab., Ames, IA (United States)

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

OSTI Identifier:: 1159289

Report Number(s):: IS-J 8377
Journal ID: ISSN 1098-0121; PRBMDO; ArticleNumber: 180411

DOE Contract Number:: DE-AC02-07CH11358

Resource Type:: Journal Article

Journal Name:: Physical Review. B, Condensed Matter and Materials Physics

Additional Journal Information:: Journal Volume: 89; Journal Issue: 18; Journal ID: ISSN 1098-0121

Publisher:: American Physical Society (APS)

Country of Publication:: United States

Language:: English

Subject:: 36 MATERIALS SCIENCE

Citation Formats


                    Vaknin, David, and Demmel, Franz. Magnetic spectra in the tridiminished-icosahedron {Fe9} nanocluster by inelastic neutron scattering.  United States: N. p., 2014. 
        Web.  doi:10.1103/PhysRevB.89.180411.

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                    Vaknin, David, & Demmel, Franz. Magnetic spectra in the tridiminished-icosahedron {Fe9} nanocluster by inelastic neutron scattering.  United States.  https://doi.org/10.1103/PhysRevB.89.180411

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                    Vaknin, David, and Demmel, Franz. 2014.  
        "Magnetic spectra in the tridiminished-icosahedron {Fe9} nanocluster by inelastic neutron scattering".  United States.  https://doi.org/10.1103/PhysRevB.89.180411.

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@article{osti_1159289,

  title        = {Magnetic spectra in the tridiminished-icosahedron {Fe9} nanocluster by inelastic neutron scattering},

  author       = {Vaknin, David and Demmel, Franz},

  abstractNote = {Inelastic neutron scattering (INS) experiments under applied magnetic field at low temperatures show detailed low-lying magnetic excitations in the so-called tridiminshed iron icosahedron magnetic molecule. The magnetic molecule consists of nine iron Fe3+ (s=5/2) and three phosphorous atoms that are situated on the 12 vertices of a nearly perfect icosahedron. The three phosphorous atoms form a plane that separates the iron cluster into two weakly coupled three- and six-ion fragments, {Fe3} and {Fe6}, respectively. The magnetic field INS results exhibit an S=1/2 ground state expected from a perfect equilateral triangle of the {Fe3} triad with a powder averaged g value =2.00. Two sets of triplet excitations whose temperature and magnetic field dependence indicate an S=0 ground state with two nondegenerate S=1 states are attributed to the {Fe6} fragment. The splitting may result from a finite coupling between the two fragments, single-ion anisotropy, antisymmetric exchange couplings, or from magnetic frustration of its triangular building blocks.},

  doi          = {10.1103/PhysRevB.89.180411},

  url          = {https://www.osti.gov/biblio/1159289},
  journal      = {Physical Review. B, Condensed Matter and Materials Physics},

  issn         = {1098-0121},

  number       = 18,

  volume       = 89,

  place        = {United States},

  year         = {Thu May 01 00:00:00 EDT 2014},

  month        = {Thu May 01 00:00:00 EDT 2014}

}

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