Rare earth-transition metal compounds $R{\mathrm{Mn}}_2{\mathrm{Ge}}_2$ ($R$=rare earth element) exhibit rich magnetic structures and intriguing physical phenomena, which have attracted sustained research interest. Different from the reported family members with light $R$ elements exhibiting noncoplanar magnetic structures, ${\mathrm{GdMn}}_2{\mathrm{Ge}}_2$ and ${\mathrm{TbMn}}_2{\mathrm{Ge}}_2$ exhibit collinear magnetic structures. In this work, single crystals of ${\mathrm{GdMn}}_2{\mathrm{Ge}}_2$ and ${\mathrm{TbMn}}_2{\mathrm{Ge}}_2$ are synthesized and their electrical transport properties are systematically investigated for the first time. Both compounds undergo two magnetic transitions, from paramagnetic (PM) to antiferromagnetic (AFM) and subsequently to ferrimagnetic (FiM), and exhibit uniaxial anisotropy. The magnetoresistance (MR) also manifests three distinct features: low-temperature positive MR, butterfly-shaped low-field MR, and high-field negative MR. A distinct anomalous Hall signal emerges below the Curie temperature, with anomalous Hall conductivity (AHC) reaching 262 ${\mathrm{\Omega }}^{-1}{\text{cm}}^{-1}$ for ${\mathrm{GdMn}}_2{\mathrm{Ge}}_2$ and 177 ${\mathrm{\Omega }}^{-1}{\text{cm}}^{-1}$ for ${\mathrm{TbMn}}_2{\mathrm{Ge}}_2$. Scaling analysis within the TYJ model indicates the intrinsic Berry curvature is the dominant mechanism. Our findings provide important insights into the intricate magnetism and transport properties in $R{\mathrm{Mn}}_2{\mathrm{Ge}}_2$ systems, underscoring their potential for spintronic applications.

Close

PrevNext

View figure in article

• Anomalous Hall effect
• Magnetic anisotropy
• Magnetoresistance
• Transport phenomena
• Ferrimagnets