Magnetic and magneto-topical properties of RMn{sub 6}Sn{sub 6} single crystals where R = Gd, Tb, Dy, Ho, Er, Tm, Lu

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Single crystals of the ternary compounds RMn{sub 6}Sn{sub 6}, where R = Gd, Tb, Dy, Ho, Er, Tm, and Lu, have been prepared by the flux growth technique. All of the compounds have the HfFe{sub 6}Ge{sub 6} type crystal structure (space group P6/mmm), and the variation of the lattice parameters with lanthanide element exhibits the lanthanide contraction as well as evidence of crystal field effects. Measurements on the magnetic properties of TbMn{sub 6}Sn{sub 6} indicate that it orders ferrimagnetically at 450K. It undergoes a change in the easy axis from close to the c axis at low temperatures to in ... continued below

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69 p.

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Clatterbuck, D.M. February 12, 1999.

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  • Ames Laboratory
    Publisher Info: Ames Lab., IA (United States)
    Place of Publication: Iowa

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Description

Single crystals of the ternary compounds RMn{sub 6}Sn{sub 6}, where R = Gd, Tb, Dy, Ho, Er, Tm, and Lu, have been prepared by the flux growth technique. All of the compounds have the HfFe{sub 6}Ge{sub 6} type crystal structure (space group P6/mmm), and the variation of the lattice parameters with lanthanide element exhibits the lanthanide contraction as well as evidence of crystal field effects. Measurements on the magnetic properties of TbMn{sub 6}Sn{sub 6} indicate that it orders ferrimagnetically at 450K. It undergoes a change in the easy axis from close to the c axis at low temperatures to in plane at higher temperatures. This transition occurs at 310K in zero DC field and can be shifted to lower temperatures by a field applied parallel to the a direction and to higher temperatures by a field applied parallel to the c direction. HoMn{sub 6}Sn{sub 6} orders ferrimagnetically at 400K, and it also undergoes a change in the easy axis between 150 and 225K with the moments located in the basal plane at high temperatures. The magnetic properties of ErMn{sub 6}Sn{sub 6} are more complex than the first two compounds. A magnetic phase diagram has been mapped out which shows that in a zero DC field the erbium sublattice orders antiferromagnetically at 65K and the manganese sublattice orders antiferromagnetically at 350K. The structure of the room temperature magneto-optic spectra for RMn{sub 6}Sn{sub 6} with R = Gd-Tm are all similar. The maximum Kerr rotation found was 0.225 degrees in TbMn{sub 6}Sn{sub 6}, and the magnitude of the maximum Kerr rotations scaled across the series as a function of the fraction of saturation. This, combined with the temperature dependence, indicates that the Kerr rotation is primarily a function of the manganese moment and is independent of the lanthanide element present. The main features of the spectra shift to slightly higher energies as one moves from gadolinium to thulium. This may be related to the contraction in the lattice parameters. The materials show good corrosion resistance in normal atmospheric conditions.

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69 p.

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OSTI as DE99002507

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  • Other Information: DN: Thesis submitted to Iowa State Univ., Ames, IA (US); TH: Thesis (M.S.)

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  • Other: DE99002507
  • Report No.: IS-T--1854
  • Grant Number: W-7405-ENG-82
  • DOI: 10.2172/348921 | External Link
  • Office of Scientific & Technical Information Report Number: 348921
  • Archival Resource Key: ark:/67531/metadc675990

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  • February 12, 1999

Added to The UNT Digital Library

  • July 25, 2015, 2:20 a.m.

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  • Nov. 6, 2015, 8:47 p.m.

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Clatterbuck, D.M. Magnetic and magneto-topical properties of RMn{sub 6}Sn{sub 6} single crystals where R = Gd, Tb, Dy, Ho, Er, Tm, Lu, report, February 12, 1999; Iowa. (digital.library.unt.edu/ark:/67531/metadc675990/: accessed September 21, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.