ac susceptibility measurements are in good agreement with the antiferromagnetic transition of the Sm compound (T-N = 9.1 K), while two different transitions are observed in the thermal behaviour of x(ac) for Gd3Ag4Sn4 at 22 and 8.2 K. Isothermal magnetisation measurements at 5 K confirm the antiferromagnetic ground state of the compounds. In the paramagnetic region Gd3Ag4Sn4 follows the Curie-Weiss law (mu(eff,) = 7.77 mu(B) and theta(p) = -64 K), while the non-Curie-Weiss behaviour of the Sm phase is discussed in terms of partial occupation of the low-lying J = 7/2 excited state by the Sm3+ ions. The values of the ordering temperatures of the two compounds do not seem to follow the de Gennes scaling.
The magnetism of Sm3Ag4Sn4 and Gd3Ag4Sn4
2005
Abstract
ac susceptibility measurements are in good agreement with the antiferromagnetic transition of the Sm compound (T-N = 9.1 K), while two different transitions are observed in the thermal behaviour of x(ac) for Gd3Ag4Sn4 at 22 and 8.2 K. Isothermal magnetisation measurements at 5 K confirm the antiferromagnetic ground state of the compounds. In the paramagnetic region Gd3Ag4Sn4 follows the Curie-Weiss law (mu(eff,) = 7.77 mu(B) and theta(p) = -64 K), while the non-Curie-Weiss behaviour of the Sm phase is discussed in terms of partial occupation of the low-lying J = 7/2 excited state by the Sm3+ ions. The values of the ordering temperatures of the two compounds do not seem to follow the de Gennes scaling.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
