Randomness driven reentrant cluster glass behavior and unconventional electrical transport in Ti2FeAl

Reentrant glassy systems are a class of disordered magnetic materials which can potentially host noncollinear spin state. Here, we focus on the role of site disorder on emergence of reentrant cluster glass state and the underlying mechanism for observation of anomalies in electrical transport properties of Ti₂FeAl. Structural and magnetic studies of Ti₂FeAl (under our synthesis protocol) reveal that it hosts strong site disorder resulting in development of a reentrant cluster glass state (below10 K) along with a ferromagnetic ordering (around 30 K). Electrical resistivity in this alloy mimics a Kondo-like behavior along with the presence of weak localization effect at low temperatures. Remarkably, Hall resistivity measurements in glassy regime indicate a nontrivial, unconventional contribution which is attributed to the existence of noncollinear spin state. We believe that our study offers an ideal platform to understand the influence of disorder on magnetic ground state of such ternary alloys.