Structure and magnetism of Gd2Co2Ga, Gd2Co2Al and Gd14Co3In2.7

Description

The paper reports on the crystal structure determination and magnetic measurements of the Gd2CoAl, Gd2Co2Ga and Gd14Co3In2.7 phases. Gd2Co2Ga and the new intermetallic compound Gd2Co2Al crystallise in the Pr2Ni2Al structure, while single crystal data show that Gd14Co3In2.7 is closely related to the Lu14Co2In3 phase, but with a different occupation of the Co and In sites. Gd2Co2Al and Gd2Co2Ga order ferromagnetically below 78.2 and 76 K, respectively, and the isothermal magnetisation in the ordered state (5 K) saturates completely to the same value for both compounds (mu(sat.) = 6.6 mu(B)/Gd atom). The intermetallic compound Gd14Co3In2.7, on the contrary, is antiferromagnetic below T-N=37 K and reveals a metamagnetic transition at mu(0)H = 1.4 Tesla, detected also by AC susceptibility measurements.

Additional details