  Resistivity and magnetostriction measurements were performed at high magnetic
fields and under pressure on UCoAl. At ambient pressure, the 1st order
metamagnetic transition at H_m ~ 0.7 T from the paramagnetic ground state to
the field-induced ferromagnetic state changes to a crossover at finite
temperature T_0 ~11 K. With increasing pressure, H_m linearly increases, while
T_0 decreases and is suppressed at the quantum critical endpoint (QCEP, P_QCEP
~ 1.5 GPa, H_m ~ 7 T). At higher pressure, the value of H_m identified as a
crossover continuously increases, while a new anomaly appears above P_QCEP at
higher field H* in resistivity measurements. The field dependence of the
effective mass (m*) obtained by resistivity and specific heat measurements
exhibits a step-like drop at H_m at ambient pressure. With increasing pressure,
it gradually changes into a peak structure and a sharp enhancement of m* is
observed near the QCEP. Above P_QCEP, the enhancement of m* is reduced, and a
broad plateau is found between H_m and H*. We compare our results on UCoAl with
those of the ferromagnetic superconductor UGe2 and the itinerant metamagnetic
ruthenate Sr3Ru2O7.
