Magnetic and transport properties of a Tb7Rh3 single crystal

Magnetic measurements on a Tb7Rh3 single crystal indicate that with decreas ing temperature, the magnetic phase changes from paramagnetic, antiferromag netic at T-N = 91 K, ferromagnetic at T-C = 73 K to re-entrant antiferromag netic at T-iota = 27 K states. The electrical resistivity shows an anomalou s temperature dependence in which, in the paramagnetic region, the resistiv ity monotonically increases with decreasing temperature, like a semiconduct or. The concept of a semimetallic band structure is applied to explain the anomalous transport properties. (C) 2001 Elsevier Science B.V. All rights r eserved.