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2001 | 100 | 5 | 789-797
Article title

High-Pressure Mössbauer Studies of Magnetism in ScFe_2 and Sc_{0.4}Ti_{0.6}Fe_2 Laves Phases

Content
Title variants
Languages of publication
EN
Abstracts
EN
We report on ^{57}Fe-Mössbauer studies of the magnetic properties in ScFe_2 and Sc_{0.4}Ti_{0.6}Fe_2 performed as a function of pressure and temperature. Both systems crystallize in the C14-type Laves phase structure with two different Fe sites 6h and 2a. The ferromagnetic properties of ScFe_2 (T_C=540 K at ambient pressure) change around 30 GPa to antiferromagnetic order of the 6h sites with non-magnetic 2a sites. The ordering temperature is lowered to T_N=300 K at 51 GPa. This pressure-dependent behaviour of ScFe_2 resembles that observed within the Sc_{1-x}Ti_xFe_2 series as a function of x. In ferromagnetic Sc_{0.4}Ti_{0.6}Fe_2 we observe, as a function of temperature and of pressure, an abrupt high-moment to low-moment transition of the Fe band moments of the 6h sites, accompanied by a rearrangement of the spin directions. In both systems the decrease in the Fe moments is accompanied by a strong increase in the volume coefficient of the isomer shift, originating from a reduced s-electron shielding capability of the d-electrons in the low-moment state.
Keywords
EN
Year
Volume
100
Issue
5
Pages
789-797
Physical description
Dates
published
2001-11
received
2001-05-14
References
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  • 3. R. Lubbers, G. Wortmann, H.F. Grunsteudel, G. Wortmann, Hyperfine Interact., 123/124, 529, 1999
  • 4. R. Lubbers, K. Rupprecht, G. Wortmann, Hyperfine Interact., 128, 115, 2000
  • 5. G. Reiss, Ph.D. thesis, University of Paderborn, Paderborn 2000, unpublished
  • 6. K. Rupprecht, diploma thesis, University of Paderborn, Paderborn 1999
  • 7. M. Strecker, G. Wortmann, Hyperfine Interact., 120/121, 187, 1999
  • 8. J. Lu, H.J. Hesse, J. Zukrowski, J. Przewoznik, G. Wortmann, in: Conf. Proc. 'ICAME-95', Ed. I. Ortalli, Vol. 50, SIF, Bologna 1996, p. 243
  • 9. R. Lubbers, Ph.D. thesis, University of Paderborn, Paderborn 2000, unpublished
  • 10. T. Friedmann, diploma thesis, University of Paderborn, 2001; K. Rupprecht, T. Friedmann, H. Giefers, G. Wortmann, B. Doyle, J. Zukrowski, High Pressure Research, in press
  • 11. D.L. Williamson, in: Mossbauer Isomer Shifts, Eds. G.K. Shenoy, F.E. Wagner, North Holland, Amsterdam 1978, p. 317
  • 12. K. Rupprecht, H. Giefers, T. Friedmann, G. Wortmann, J. Zukrowski, A. Schiwek, F. Porsch, unpublished results
Document Type
Publication order reference
YADDA identifier
bwmeta1.element.bwnjournal-article-appv100n509kz
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