DC MAGNETIZATION MEASUREMENTS IN EU2CUO4GD3+

R. D. ZYSLER1, A. BUTERA, A. FAINSTEIN, M. TOVAR, AND Z. FISK

JOURNAL OF APPLIED PHYSICS

AMER INST PHYSICS

Lugar: American Institute of Physics; Año: 1993 vol. 73 p. 5680 - 5682

0021-8979

dc magnetization measurements in a Gd doped Eu2CuO4 single crystal indicate the appearance below TN=243 K, of a weak ferromagnetic component Ms(T), in addition to the Van Vleck paramagnetism of the Eu3+ ions. Ms(T) is oriented parallel to the (001) plane and its magnitude and in‐plane angular dependence are strongly dependent on the cooling conditions. For samples cooled in zero magnetic field the magnetization is isotropic in the (001) plane with Ms(0)=2.2(4)×10−3 μB/formula unit. For samples cooled in a field (FC), Ms(T) increases as a function of the field applied for cooling, HFC, reaching Ms(0)=5.0(5)×10−3 μB/formula unit for HFC=10 kG. A uniaxial magnetic anisotropy develops in this case with an easy axis along the [110] crystallographic direction lying closer to the orientation of HFC. A magnetic free energy including second and fourth order in‐plane anisotropy terms provides a good description of the experimental results, with H(2)=−85(5) G and H(4)=10(3) G.