Electrical properties and dHvA experiments in ferromagnet Ce ₃Al₁₁

High-quality single crystals of Ce₃Al₁₁ with the orthorhombic crystal structure have been grown by the Al-flux method. Signatures for ferromagnetic and antiferromagnetic orderings at T_C = 6.3K and T_N = 3.2K, respectively, have been observed in the electrical resistivity. On application of pressure, the Néel temperature T _N decreases rapidly and goes to zero around 3GPa. On the other hand, the Curie temperature T_C is found to be robust against pressure up to 4GPa. Further, dHvA oscillations have been obtained for magnetic field along the [0 1 0] direction. A cyclotron mass m_c* as large as 28m₀ (m₀: rest mass of an electron) has been observed for one of the dHvA branches, indicating the heavy fermion nature of Ce ₃Al₁₁.