抄録
The electrical resistivity, magnetization, specific heat andthermoelectric power measurements were performed on a NdNiAl4 single crystal along the principalaxes of the orthorhombic cell. The easy axis of magnetization was parallel to the b axis below 20, K.The spin-flipping was observed at the magnetic field 4.4, T along the baxis at 2, K.The magnetic phase diagram was determined from the spin-flipping field.The huge magnetic anisotropy energy was estimated from the experiments of the magnetic susceptibility and magnetization.The energy gap newly occurred below TN was observed in the electrical resistivity along the b axis.From this result we have speculated that a new magnetic periodicity is made along the b axis below TN.The magnetic susceptibility for the principal axes wasdiscussed on the bases of the crystalline-electric-field and molecular-field theories.
