Magnetic Field Effects on Electrical Resistivity in Metamagnetic State of MnP Single Crystal

The magnetic field effects on the electrical resistivity in the metamagnetic state of MnP single crystal have been studied in various orientations of the current flow and the magnetic field in the range of temperature from 4.2°K to 50°K. An abrupt change of the resistivity is observed when the screw state transfers to the ferromagnetic state by the magnetic field and the difference in both states is almost isotropic in all cases where the current flows along each of the three principal axes. This is explained by the assumption that the Fermi surfaces of electrons and holes which are separated by the screw wave vector Q , are overlapped by the exchange interaction between the localized magnetic moments and the conduction electrons. No abrupt change are observed in the case of the magnetic field along the b axis, and it is discussed in connection with the transition from the screw state to the fan state.