Low energy spin excitations in chromium metal

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Neutron scattering experiments with full polarization analysis have been performed with a single crystal of chromium to study the low-energy spin fluctuations in the transverse spin density wave (TSDW) state. A number of remarkable results have been found. Inelastic scattering observed close to the TSDW satellite positions at (1 {+-} {delta},0,0) does not behave as expected for magnon scattering. In particular, the scattering corresponds to almost equally strong magnetization fluctuations both parallel and perpendicular to the ordered moments of the TSDW phase. As the Neel temperature is approached from below, scattering at the commensurate wavevector (1,0,0) increases in intensity as ... continued below

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14 p.

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Pynn, R.; Azuah, R.T.; Stirling, W.G. & Kulda, J. December 31, 1997.

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  • Pynn, R. Los Alamos National Lab., NM (United States)
  • Azuah, R.T. Hahn-Meitner-Inst., Berlin (Germany)
  • Stirling, W.G. Univ. of Liverpool (United Kingdom). Dept. of Physics
  • Kulda, J. Inst. Laue Langevin, Grenoble (France)

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Neutron scattering experiments with full polarization analysis have been performed with a single crystal of chromium to study the low-energy spin fluctuations in the transverse spin density wave (TSDW) state. A number of remarkable results have been found. Inelastic scattering observed close to the TSDW satellite positions at (1 {+-} {delta},0,0) does not behave as expected for magnon scattering. In particular, the scattering corresponds to almost equally strong magnetization fluctuations both parallel and perpendicular to the ordered moments of the TSDW phase. As the Neel temperature is approached from below, scattering at the commensurate wavevector (1,0,0) increases in intensity as a result of critical scattering at silent satellites (1,0, {+-} {delta}) being included within the spectrometer resolution function. This effect, first observed by Sternlieb et al, does not account for all of the inelastic scattering around the (1,0,0) position, however, Rather, there are further collective excitations, apparently emanating from the TSDW satellites, which correspond to magnetic fluctuations parallel to the ordered TSDW moments. These branches have a group velocity that is close to that of (1,0,0) longitudinal acoustic (LA) phonons, but assigning their origin to magneto-elastic scattering raises other unanswered questions.

Physical Description

14 p.

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INIS; OSTI as DE99000662

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  • NATO Advanced Study Institute: dynamical properties of unconventional magnetic systems, Geilo (Norway), 2-12 Apr 1997

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  • Other: DE99000662
  • Report No.: LA-UR--98-1855
  • Report No.: CONF-970452--
  • Grant Number: W-7405-ENG-36
  • Office of Scientific & Technical Information Report Number: 677141
  • Archival Resource Key: ark:/67531/metadc711797

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  • December 31, 1997

Added to The UNT Digital Library

  • Sept. 12, 2015, 6:31 a.m.

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  • May 5, 2016, 6:29 p.m.

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Pynn, R.; Azuah, R.T.; Stirling, W.G. & Kulda, J. Low energy spin excitations in chromium metal, article, December 31, 1997; New Mexico. (digital.library.unt.edu/ark:/67531/metadc711797/: accessed November 14, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.