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We studied the magnetoresistivity of the AM2B2 and A3Rh8B6 (A = Ca, Sr; M =Rh, Ir) compounds within the ranges 1.8<=T<=300 K and 0<=H<=50 kOe. Thezero-field resistivity {\rho}0(T) is metallic and follows closely theBloch-Gr\"uneisen description. A positive, nonsaturating, and dominantlylinear-in-H magnetoresistivity was observed in all samples, including the oneswith a superconducting ground state. Such {\Delta}{\rho}T(H)/{\rho}T(0),reaching 1200% in favorable cases, was found to be much stronger for the AM2B2compounds and to decrease with temperature as well as when Ca is replaced bySr, or Rh is replaced by Ir. Finally, the general features of the observedmagnetoresistivity will be discussed in terms of the Abrikosov model for thelinear magnetoresistivity in inhomogeneous materials.

Linear magnetoresistivity in the ternary AM2B2 and A3Rh8B6 phases (A = Ca, Sr; M = Rh, Ir)