Superconductivity and magnetism in the series R/sub 2/Fe/sub 3/Si/sub 5/ by Moessbauer and magnetization measurements

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Members of the R/sub 2/Fe/sub 3/Si/sub 5/ series become either superconducting or magnetically ordered depending on whether the metal atom R (= rare earth, Y or Sc) is diamagnetic or paramagnetic respectively. Moessbauer effect and magnetization measurements were made to determine the magnetic state of the iron and the nature of the superconducting electrons. /sup 57/Fe Moessbauer measurements on the Sc, Dy and Er compounds all showed two partially resolved, quadrupole split spectra at all temperatures from 300 to 1.5/sup 0/K, indicating that there is no resolvable magnetic interaction at the iron site. No major change in the spectrum of ... continued below

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Pages: 8

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Cashion, J. D.; Shenoy, G. .; Niarchos, D.; Viccaro, P. J.; Aldred, A. T. & Falco, C. M. Autumn 1980.

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Members of the R/sub 2/Fe/sub 3/Si/sub 5/ series become either superconducting or magnetically ordered depending on whether the metal atom R (= rare earth, Y or Sc) is diamagnetic or paramagnetic respectively. Moessbauer effect and magnetization measurements were made to determine the magnetic state of the iron and the nature of the superconducting electrons. /sup 57/Fe Moessbauer measurements on the Sc, Dy and Er compounds all showed two partially resolved, quadrupole split spectra at all temperatures from 300 to 1.5/sup 0/K, indicating that there is no resolvable magnetic interaction at the iron site. No major change in the spectrum of Dy/sub 2/Fe/sub 3/Si/sub 5/ was observed in passing through its antiferromagnetic ordering temperature of approx. 4/sup 0/K. Measurements in an applied field of 5.6 T set an upper limit of 0.03 ..mu../sub B/ for the iron moment in Sc/sub 2/Fe/sub 3/Si/sub 5/. However, measurements at 4.2/sup 0/K in fields up to 7 T for the Dy compound gave an internal field approx. 9% smaller than the applied field and linear with applied field. This corresponds to an induced moment at the iron site of approx. 0.07 ..mu../sub B/ at 7 T applied field. The /sup 161/Dy Moessbauer resonance clearly showed the onset of magnetic order around 4/sup 0/K and the magnetic moment on Dy at 1.5/sup 0/K was found to be 7.0 +- 0.2 ..mu../sub B/ consistent with the magnetization measurements. The nature of the superconducting electrons in the R/sub 2/Fe/sub 3/Si/sub 5/ series is discussed in the light of available measurements.

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Pages: 8

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NTIS, PC A02/MF A01.

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  • 26. annual conference on magnetism and magnetic metals, Dallas, TX, USA, 11 Nov 1980

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  • Other: DE81023804
  • Report No.: CONF-801134-15
  • Grant Number: W-31-109-ENG-38
  • Office of Scientific & Technical Information Report Number: 6398439
  • Archival Resource Key: ark:/67531/metadc1208978

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  • Autumn 1980

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  • July 5, 2018, 11:11 p.m.

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  • Oct. 30, 2018, 12:16 p.m.

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Cashion, J. D.; Shenoy, G. .; Niarchos, D.; Viccaro, P. J.; Aldred, A. T. & Falco, C. M. Superconductivity and magnetism in the series R/sub 2/Fe/sub 3/Si/sub 5/ by Moessbauer and magnetization measurements, article, Autumn 1980; Illinois. (digital.library.unt.edu/ark:/67531/metadc1208978/: accessed November 17, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.