Magnetic ordering of ${\mathrm{Nd}}^{3+}$ ions in the high-temperature superconductor ${\mathrm{NbBa}}_2$${\mathrm{Cu}}_{3\mathrm{-}\mathit{x}}$${\mathrm{Ga}}_{\mathit{x}}$${\mathrm{O}}_{7\mathrm{-}\mathit{y}}$ (0<x≤0.5 and 0.05<y<0.15)

We report on the magnetic specific heats of ${\mathrm{NdBa}}_2$ ${\mathrm{Cu}}_{3\mathrm{-}\mathit{x}}$ ${\mathrm{Ga}}_{\mathit{x}}$ ${\mathrm{O}}_{7\mathrm{-}\mathit{y}}$ measured in the temperature range from 0.45 to 100 K. The Ga substitution in the Cu chain sites descreases the superconducting transition temperature drastically. Simultaneously, there is a systematic increase of temperature of magnetic ordering of the ${\mathrm{Nd}}^{3+}$ ions with Ga substitution. The nature of the magnetic ordering of ${\mathrm{Nd}}^{3+}$ ion changes from two-dimensional (2D) anisotropic Ising behavior for the oxygen rich compound with zero Ga content to 1D Ising-like for low Ga concentration. With higher Ga concentration, at the advent of nonsuperconductivity, long-range (3D) magnetic ordering is reestablished. The increase of the magnetic interaction between the ${\mathrm{Nd}}^{3+}$ ions by the substitution of Ga is discussed with the variation of carrier concentration, increase in the Nd-O bond length and with the additional interaction due to Cu-ion ordering in the nonsuperconducting compounds.