Magnetic properties of a single crystal of the metamagnetic compound (Fe0.98Ru0.02)(2)P

The magnetization and electrical resistivity of a single crystal of (Fe0.98 Ru0.02)(2)P have been measured as a function of temperature from 5 to 300 K and in magnetic fields up to 5.5 T. The compound orders antiferromagnetica lly at T-N = 135 K and exhibits field-induced transitions to the ferromagne tic state in both principal directions. At 5 K, the magnetic moment along t he c-axis is 2.9 mu(B)/f.u. after the transition. The transitions are accom panied by a giant magnetoresistance effect (Delta p/p > 25%), indicating a considerable reconstruction of the Fermi surface. (C) 2000 Elsevier Science S.A. All rights reserved.