MAGNETIC-SUSCEPTIBILITY OF LAXND1-XF3 SINGLE-CRYSTALS

The ac susceptibility of LaxNd1-xF3 single crystals, for 0 less than o r equal to x less than or equal to 0.1, has been measured from 1.5 up to 40 K and their de susceptibility for 0 less than or equal to x less than or equal to 1 has been measured from 3 up to 300 K in magnetic f ields up to 0.2 T. In both susceptibilities the magnetic fields were a pplied parallel to the crystallographic a-axis (perpendicular to the c -axis). The effective Bohr magneton number p(eff) and paramagnetic Cur ie temperature theta(p) have been obtained, using the Curie-Weiss law in the temperature range 100-300 K. Also the g-values corresponding to the five Kramers doublets in the I-4(9/2), ground multiplet of Nd3+ i on in LaxNd1-xF3 have been determined in the direction perpendicular t o the c-axis, using the Van Vleck theory of paramagnetic susceptibilit y. The effect of the dilution of the paramagnetic Nd3+ ions with diama gnetic La3+ ions is also discussed.