A first-order itinerant electron metamagnetic (IEM) transition above the Curie temperature Tc for ferromagnetic La(Fe_xSi_1-x)13 compounds has been confirmed by applying magnetic field. The volume change just above T_...A first-order itinerant electron metamagnetic (IEM) transition above the Curie temperature Tc for ferromagnetic La(Fe_xSi_1-x)13 compounds has been confirmed by applying magnetic field. The volume change just above T_C for x=0.88 is huge of about 1.5%, which is caused by a large magnetic moment induced by the IEM transition. These compounds have a possibility for practical applications as giant magnetostrictive materials. Pronounced Invar effects bring about a negative thermal expansion below TC, closely correlated with the negative mode-mode coupling among spin fluctuations.展开更多
Thermal neutron inelastic scattering experiments have been successfully used tostudy the lattice dynamics of the classical crystalline invar alloys. Y. Endoh et al. havesystematically investigated the temperature depe...Thermal neutron inelastic scattering experiments have been successfully used tostudy the lattice dynamics of the classical crystalline invar alloys. Y. Endoh et al. havesystematically investigated the temperature dependence of the phonon dispersion forthe Fe-based crystalline invar alloys Fe<sub>65</sub>Ni<sub>35</sub>, Fe<sub>3</sub>Pt and Fe<sub>70</sub>Mn<sub>30</sub> by inelasticneutron scattering, and found that the transverse acoustic-phonon modes become softbelow the magnetic transition temperature. It is suggested that the phonon softeningof these invar alloys may be attributed to the enhancement of展开更多
基金Japanese Ministry of Education, Science, Sports and Culture!Grantin-Aid for Scientific Research (B)(2) 08455287
文摘A first-order itinerant electron metamagnetic (IEM) transition above the Curie temperature Tc for ferromagnetic La(Fe_xSi_1-x)13 compounds has been confirmed by applying magnetic field. The volume change just above T_C for x=0.88 is huge of about 1.5%, which is caused by a large magnetic moment induced by the IEM transition. These compounds have a possibility for practical applications as giant magnetostrictive materials. Pronounced Invar effects bring about a negative thermal expansion below TC, closely correlated with the negative mode-mode coupling among spin fluctuations.
文摘Thermal neutron inelastic scattering experiments have been successfully used tostudy the lattice dynamics of the classical crystalline invar alloys. Y. Endoh et al. havesystematically investigated the temperature dependence of the phonon dispersion forthe Fe-based crystalline invar alloys Fe<sub>65</sub>Ni<sub>35</sub>, Fe<sub>3</sub>Pt and Fe<sub>70</sub>Mn<sub>30</sub> by inelasticneutron scattering, and found that the transverse acoustic-phonon modes become softbelow the magnetic transition temperature. It is suggested that the phonon softeningof these invar alloys may be attributed to the enhancement of
