Magnetism of U(4)(Ru(1-x)Os(x))(7)Ge(6) solid solutions
U4Ru7Ge6 orders ferro-magnetically at low temperature, displays a Kondo-like resistivity behaviour and has heavy-fermion properties, whereas U(4) 0(s7) 7Ge(6) is a Pauli paramagnet. We measured the magnetisation and susceptibility of eleven U(4)[Ru(1)-xOs)7Ge(6) compounds (O</=x</=l with steps of 0.1) between 2 K and 300 K under external magnetic fields up to 6.5 T, using a SQUID magnetometer. For the solid solutions, we observe clearly a rapid loss of magnetism for increasing x: the ordering temperature decreases from 12 K for X=0 down to less than 2 K for x=0.3, whereas compounds with higher x are paramagnetic. The susceptibilities of all compounds follow a modified Curie-Weiss law. Values of Curie-Weiss parameters are discussed in the frame of the Doniach model.
Bibliographic Reference: An oral report given at: 13th International Conference on Solid Compounds of Transition Metals. Held in: Stresa, 4-7 April (2000)
Record Number: 200013751 / Last updated on: 2001-09-18
Original language: en
Available languages: en