High Spin-Low Spin Transition in MnAs_1−xP_x(x=0.075)

抄録

Some of the physical properties of the compound MnAs_1−xP_x(x=0.075) are investigated by the various measurements, and they can be divided into four different temperature ranges. The compound is: i) for T>T₂, a high spin state paramagnet with the NiAs type (B8₁), ii) for T₁<T<T₂, a high spin state paramagnet with the MnP type (B31), iii) for T_N<T<T₁, an intermediate spin state paramagnet with the MnP type and iv) for T<T_N, a low spin state antiferromagnet with the MnP type. Especially in the region iii), an interesting phenomenon of a high spin-low spin transition is observed, and characterized by a large change in the lattice constants and the electrical resistivity.