- Tytuł:
- High-Pressure Mössbauer Studies of Magnetism in ScFe$\text{}_{2}$ and Sc$\text{}_{0.4}$Ti$\text{}_{0.6}$Fe$\text{}_{2}$ Laves Phases
- Autorzy:
-
Rupprecht, K.
Lu, J.
Wortmann, G.
Przewoźnik, J.
Żukrowski, J. - Powiązania:
- https://bibliotekanauki.pl/articles/2029022.pdf
- Data publikacji:
- 2001-11
- Wydawca:
- Polska Akademia Nauk. Instytut Fizyki PAN
- Tematy:
-
75.50.Bb
76.80.+y - Opis:
- We report on $\text{}^{57}$Fe-Mössbauer studies of the magnetic properties in ScFe$\text{}_{2}$ and Sc$\text{}_{0.4}$Ti$\text{}_{0.6}$Fe$\text{}_{2}$ 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$\text{}_{2}$ (T$\text{}_{C}$=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$\text{}_{N}$=300 K at 51 GPa. This pressure-dependent behaviour of ScFe$\text{}_{2}$ resembles that observed within the Sc$\text{}_{1-x}$Ti$\text{}_{x}$Fe$\text{}_{2}$ series as a function of x. In ferromagnetic Sc$\text{}_{0.4}$Ti$\text{}_{0.6}$Fe$\text{}_{2}$ 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.
- Źródło:
-
Acta Physica Polonica A; 2001, 100, 5; 789-797
0587-4246
1898-794X - Pojawia się w:
- Acta Physica Polonica A
- Dostawca treści:
- Biblioteka Nauki
Artykuł