Interference-induced quantum corrections to electronic transport provide a powerful route to probe localization/antilocalization phenomena in condensed-matter systems. Here, we report quantum-interference effects in a three-dimensional (3D) system, namely, the full Heusler alloy ${\mathrm{V}}_2\mathrm{NbAl}$, that are consistent with the presence of chiral spin correlations at low temperatures (T). We observe a crossover from weak localization (WL) to weak antilocalization (WAL) together with a pronounced low-field Hall anomaly, often discussed in terms of a topological Hall contribution, which is attributed to local symmetry breaking arising from intrinsic antisite disorder. The extracted phase coherence length ($l_{\varphi }\simeq 23$ nm at 2 K) is significantly larger than the mean free path, confirming the quantum diffusive nature of charge transport. The present study explores the interplay between disorder-driven noncollinear magnetic correlations and unconventional quantum transport in ${\mathrm{V}}_2\mathrm{NbAl}$. Ab initio calculations reveal a metallic state with fully compensated ferrimagnetic (CF) behavior for the B2-disordered structure (as confirmed by XRD data). Overall, our results highlight how intrinsic disorder in a 3D-compensated Heusler alloy can give rise to unconventional quantum-interference effects and Hall transport behavior.

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• Quantum interference effects
• Quantum transport
• Spintronics
• Topological Hall effect
• Weak antilocalization
• Chiral magnets
• Disordered alloys
• Heusler alloy
• Ab initio calculations
• X-ray diffraction