De Haas–van Alphen Effect and Fermi Surface Properties of Antiferromagnet EuSnP

Abstract

EuSnP with the tetragonal structure is known to be an antiferromagnet with a Néel temperature T N = 21 K. The first-order-like antiferromagnetic transition and a sharp metamagnetic transition at H m = 20 kOe in the magnetization curve at 2 K for the magnetic field along the easy-axis of H ∥ [001] are characteristic in this compound. We carried out the pressure experiment. The Eudivalent electronic state is found to be stable against pressure, with dT N /dP = 9.9 K/GPa, reaching T N = 100 K at 8 GPa. The present Néel temperature of T N = 100 K is extremely large in the Eu compounds. We furthermore clarified the Fermi surface properties from the de Haas-van Alphen experiment and the FLAPW energy band calculation, revealing a nearly cylindrical Fermi surface.