Fermi surface measurements of ZrB2 by the de Haas-van Alphen effect

The de Haas-van Alphen (dHvA) effect in ZrB2 single crystal has been studied using the field modulation technique. Observed dHvA frequencies in the (10 bar 10), (11 bar 20) and (0001) planes range from the order of 106 to 107 G. The dHvA frequencies, together with a recent APW band structure calculation, show that the Fermi surface of ZrB2 consists of a set of ring-like electron surfaces around the K points on which the nearly ellipsoidal arms are joined together, and a wrinkled dumbbell-like hole surface at the A point. Estimation of the carrier concentration indicates that ZrB2 is a semi-metal with 0.04 electrons (holes) per unit cell. (author)