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

• Authors: K. Rupprecht , J. Lu , G. Wortmann , J. Przewoźnik , J. Żukrowski
• 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

75.50.Bb; 76.80.+y

Discipline

• 76.80.+y: Mössbauer effect; other γ-ray spectroscopy(see also 33.45.+x Mössbauer spectra—in atomic and molecular physics; for biophysical applications, see 87.64.kx; for chemical analysis applications, see 82.80.Ej)
• 75.50.Bb: Fe and its alloys

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2001
• Volume: 100
• Issue: 5
• Pages: 789-797

Dates

published

2001-11

received

2001-05-14

Contributors

author

K. Rupprecht

• Physics Department, University of Paderborn, 33095 Paderborn, Germany

author

J. Lu

• Physics Department, University of Paderborn, 33095 Paderborn, Germany

author

G. Wortmann

• Physics Department, University of Paderborn, 33095 Paderborn, Germany

author

J. Przewoźnik

• University of Mining and Metallurgy, Al. Mickiewicza 30, 30-059 Kraków, Poland

author

J. Żukrowski

• University of Mining and Metallurgy, Al. Mickiewicza 30, 30-059 Kraków, Poland

References

• 1. E. Burzo, A. Chelkowski, H. Kirchmeyr, in: Landolt Bornstein New Series III, Vol. 19d2, Ed. H.P.J. Wijn, Springer, Berlin 1990, p. 83
• 2. Y. Nishihara, Y. Yamaguchi, J. Phys. Soc. Japan, 54, 1122, 1985; ibid., 55, 920, 1986
• 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

Identifiers

DOI

10.12693/APhysPolA.100.789