Transport properties across the metamagnetic transition in UCoAl

We report the results on the magnetoresistance and thermoelectric power in a single crystal of UCoAl exhibiting metamagnetic transition at H-M( simila r to 1 T). The longitudinal (transverse) magnetoresistance shows a step-lik e increase (decrease) across H-M with increasing field. Thermoelectric powe r also shows a sharp change Delta S similar to 10 mu V/K (at 4.5 K) across H-M From these results, we inferred that the high field state is a 5f-band split ferromagnetic state. (C) 1999 Elsevier Science B.V. All rights reserv ed.