Sensitivity of magnetic properties to chemical pressure in lanthanide garnets Ln 3 A 2 X 3 O 12 , Ln  =  Gd, Tb, Dy, Ho, A  =  Ga, Sc, In, Te, X  =  Ga, Al, Li

A systematic study of the structural and magnetic properties of three-dimensionally frustrated lanthanide garnets Ln A X O , Ln = Gd, Tb, Dy, Ho, A = Ga, Sc, In, Te, X = Ga, Al, Li is presented. Garnets with Ln = Gd show magnetic behaviour consistent with isotropic Gd spins; no magnetic ordering is observed for T ⩾ 0.4 K. Magnetic ordering features are seen for garnets with Ln = Tb, Dy, Ho in the temperature range 0.4