Magnetic, transport, and thermal properties of ferromagnetic EuB6

Abstract

Magnetic measurements on Al‐flux grown EuB₆ crystals show that this material orders ferromagnetically with a transition temperature T_c=13.7 K. The effective moment derived from paramagnetic susceptibility measurements gives μ_eff=7.76 μ_B, and the saturation magnetization extrapolated to 0 K is within 10% of the theoretical value of 7 μ_B expected for Eu⁺². The magnetic order, however, cannot be that of a simple colinear ferromagnet because the magnetic specific heat in zero applied magnetic field shows a broad maximum centered about 9 K rather than the expected λ‐like anomaly at 13.7 K. Finally, transport measurements suggest that EuB₆ is an intrinsic semimental.