HoAgGe crystallizes in a frustrated ZrNiAl-type structure with ${\mathrm{Ho}}^{3+}$ ions forming a distorted kagome lattice in the $ab$ plane, and is reported to host a crystalline kagome spin ice state, characterized by discrete degeneracies and distinct transport properties. Here, the field-temperature phase diagrams of HoAgGe for $a$-, $b$-, and $c$-axes fields are probed via systematic specific heat, magnetic susceptibility, and resistivity measurements. Multiple metamagnetic transitions are observed for $ab$ plane fields, leading to complex field-temperature phase diagrams for both $a$- and $b$-axis fields. The distinct phase diagrams observed for $a$- and $b$-axis fields indicate a strong in-plane magnetic anisotropy, consistent with the Ising nature of the ${\mathrm{Ho}}^{3+}$ moments. In contrast, the $c$-axis field phase diagram does not exhibit metamagnetic transitions. These results provide a comprehensive characterization of HoAgGe and constrain models of its magnetic interactions.

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• Magnetic anisotropy
• Magnetic phase transitions
• Antiferromagnets
• Heavy-fermion systems
• Magnetic systems
• Strongly correlated systems