The magnetic Zintl phase ${\mathrm{Eu}}_3{\mathrm{In}}_2{\mathrm{As}}_4$ is theoretically predicted to host an ideal Weyl semimetal state in a ferromagnetic order, which could be induced from its antiferromagnetic ground state by an external magnetic field. Through comprehensive magnetotransport experiments, we investigate its field-induced electronic evolution. While an external magnetic field suppresses the antiferromagnetic order as expected, it drives the system into a forced ferromagnetic state with short-range correlations. This field-induced state exhibits a combination of transport features—a nonsaturating linear magnetoresistance (up to 58.9%), a high carrier mobility ($2.3\times {10}^3\mathrm{c}{\mathrm{m}}^2{\mathrm{V}}^{-1}{\mathrm{s}}^{-1}$), a light cyclotron effective mass ($\sim 0.23m_{\mathrm{e}}$), and a Berry phase close to π. The field-polarized state concurrently shows a profoundly suppressed anomalous Hall effect ($\sim 0.037\times {10}^{-3}\mathrm{m}{\mathrm{\Omega }}^{-1}\mathrm{c}{\mathrm{m}}^{-1}$, which is far less than the theoretical value), which does not support the ideal Weyl semimetal state. Instead, observations point to a field-induced electronic evolution. This comprehensive data set is of interest for understanding field-induced electronic evolution and magnetotransport in Eu-based correlated semimetals.

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• Crystal growth
• Electronic structure
• Magnetic phase transitions
• Topological materials
• Weyl semimetal
• Quantum oscillation techniques