Pressure-driven electronic reconstruction and anomalous Hall transport evolution in monoclinic FeNbTe₂

Pressure provides a clean route to uncover hidden electronic and magnetic instabilities in layered tellurides by continuously tuning bandwidths and Fermi-surface topology without introducing chemical disorder. Here we report high-pressure electrical transport, magnetoresistance, Hall effect, and synchrotron x-ray diffraction measurements on single-crystalline monoclinic FeNbTe₂. At ambient pressure, FeNbTe₂ displays a low-temperature resistive upturn together with negative magnetoresistance and an anomalous Hall effect. Upon compression across P_c ~ 5.5 GPa, the resistive upturn is fully suppressed, the anomalous Hall response collapses, and the Hall coefficient reverses sign. Room-temperature high-pressure synchrotron x-ray diffraction reveals that the monoclinic structure remains stable throughout the investigated pressure range, with no evidence for a symmetry-changing structural transition. These combined results suggest a pressure-driven electronic reconstruction near P_c within the preserved monoclinic framework, accompanied by a marked modification of the magnetic transport response. Our work establishes monoclinic FeNbTe₂ as a useful platform for exploring pressure-controlled electronic reconstruction and anomalous transverse transport in layered magnetic tellurides.