We have synthesized for the first time CePtAs and investigated the transport and magnetic properties. The electrical resistivity ρ and Hall constant RH measured on a single crystal show a strong and peculiar anisotropy. The ρ along the c-axis is about 1300 μΩ cm at 300 K and increases with decreasing temperature like semiconductors or Kondo compounds. On the other hand, ρ along the a-axis shows a metallic behavior. Hall constant is negative for magnetic field within the c-plane, whereas its sign is positive for the magnetic field along the c-axis. From the measurement of magnetic susceptibility χ, it is revealed that CePtAs is an antiferromagnet with transition temperature TN of 1.0 K. Below TN, metamagnetic behavior is observed; for the magnetic field along the a-axis, magnetization increases up to 0.4 μB at 4 kOe, whereas for the field along the c-axis 0.7 μB is obtained at 10 kOe.
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics