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The new R 2 Co 2 Al compounds (R=Pr, Nd, Sm, Gd, Tb, Dy, Ho, Er, Tm, Y), studied by single crystal and powder X-ray diffraction, crystallize with the W 2 CoB 2  structure type. Pr 2 Co 2 Al is dimorphic, showing also its own monoclinic structure ( a =9.595 Å,  b =5.602 Å,  c =7.753 Å,  β =103.89°), which is closely related to the W 2 CoB 2  type. Both structures are based on different packing of chains of cobalt-centred double trigonal prisms formed by rare earth and aluminum atoms. The electrical resistivity, measured in the 13-300K temperature range for all phases (save Y 2 Co 2 Al), always shows a transition point at temperatures going from 14K for Tm 2 Co 2 Al to 94K for Tb 2 Co 2 Al. As already found for Gd 2 Co 2 Al, these points should correspond to an order-disorder magnetic transition, and the deviations from de Gennes scaling indicate the influence of both the crystalline electric field and the strong coupling between 4f and conduction electrons.

Structure and transport properties of the R 2 Co 2 Al compounds (R=Pr, Nd, Sm, Gd, Tb, Dy, Ho, Er, Tm, Y)