擬二元系化合物Sm_<1-x>R_xAl_2熱磁気特性  [in Japanese] Thermomagnetic Behavior of Pseudo-Binary Compounds Sm_<1-x>R_xAl_2  [in Japanese]

The thermomagnetic behavior of ferromagnetic pseudo-binary compounds Sm_<1-x>R_xAl_2 (R=Sc, Y, La, Nd, Gd) was studied. For R=Sc, Y,La, the ordering temperature gently decreased in proportion to x, and little change in shape was observed in their thermomagnetic curves. The magnetic substituents Nd and Gd, on the other hand, had a considerable influence on the thermomagnetic properties. Due to the negative contribution of the spin moments to the magnetization in SmAl_2 and ferromagnetic coupling between the spins of Sm and the substituent, Nd increased the resultant magnetization and a small amount of Gd decreased it. In the latter case, compensation between the partial magnetization arising from the spin moments and that arising from the ofbital ones was observed at 81 K and 64 K for x=1.8% and 2.6%, respectively.