Abstract
We report the electrical transport of the layered, spin-ladder antiferromagnet ${\mathrm{TaFe}}_{1.25}{\mathrm{Te}}_{3}$ (${T}_{N}\ensuremath{\sim}167$ K) under intense magnetic field (up to 60 T) and high pressure (up to 50 GPa). In high magnetic field, ${\mathrm{TaFe}}_{1.25}{\mathrm{Te}}_{3}$ undergoes two metamagnetic transitions, manifested in both the magnetoresistance and the Hall resistivity. Synchrotron x-ray diffraction reveals no obvious structural transition up to $\ensuremath{\sim}50$ GPa. However, the application of a small pressure ($\ensuremath{\sim}0.7$ GPa) fosters a sizable anomalous Hall conductivity and a negative magnetoresistance, possibly arising from the competing ferromagnetic exchange interaction in this antiferromagnet. Both the anomalous Hall conductivity and the negative magnetoresistance culminate at a pressure of $\ensuremath{\sim}4$ GPa. With further increase of pressure, both physical quantities diminish. The Hall coefficient and the magnetoresistance change sign above $\ensuremath{\sim}20$ GPa, presumably due to the cessation of ferromagnetic spin fluctuations in this high pressure regime.
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