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Hall effect measurements were performed under pressure and magnetic field upto 2.2 GPa and 16 T on a single crystal of UCoAl. At ambient pressure, thesystem undergoes a first order metamagnetic transition at the critical fieldB_m = 0.7 T from a paramagnetic ground state to a field-induced ferromagneticstate. The Hall signal is linear at low field and shows a step-like anomaly atthe transition, with only little change of the Hall coefficient. The anomaly issharpest at the temperature of the critical end point T_0 = 12 K above whichthe first order metamagnetic transition becomes a crossover. Under pressure B_mincreases and T_0 decreases. The step-like anomaly in the Hall effectdisappears at P_M ~= 1.3 GPa and the metamagnetic transition is not detectedabove the quantum critical end point (QCEP) at P_Delta ~= 1.7 GPa, B_m ~= 7 T.Using magnetization data, we analyse our Hall resistivity data at ambientpressure in order to quantitatively account for both ordinary and anomalouscontributions to the Hall effect. Under pressure, a drastic change in the fielddependence of the Hall coefficient is found on crossing the QCEP. A possibleFermi surface change at B_m remains an open question.

Ferromagnetic Quantum Criticality Studied by Hall Effect Measurements in UCoAl