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The magnetization and susceptibility of single-crystalline UCoAl were measured under high pressures to Pϭ1.2 GPa. A sharp metamagnetic transition was observed only in magnetic fields along the c axis. The critical field is B c ϭ0.65 T at Pϭ0 GPa, which increases with pressure and temperature. The susceptibility for ambient pressure shows a broad maximum at T max ϭ20 K. The value of T max increases with pressure. A theory of the itinerant metamagnetic transition has been generalized for the case of anisotropic spin fluctuations. The observed pressure dependence of the inverse susceptibility at T max , the temperature T 0 for the disappearance of the metamagnetic transition, and the temperature dependence of B c can be explained with this theory. ͓S0163-1829͑99͒04409-4͔

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