title: Ferromagnetic exchange couplings showing a chemical trend in Cu-Ln-Cu complexes (Ln = Gd, Tb, Dy, Ho, Er).
abstract: Exchange couplings in isomorphous [LnCu(2)] were evaluated by high-frequency electron paramagnetic resonance and magnetization studies. The exchange parameter J(Ln-Cu) was decreased with an increase in the atomic number; J(Ln-Cu)/k(B) = 4.45(11), 2.27(6), 0.902(10), 0.334(3), and 0.136(8) K for Ln = Gd, Tb, Dy, Ho, and Er, respectively.
authors.affiliation: Department of Engineering Science, The University of Electro-Communications, Chofu, Tokyo 182-8585, Japan.
authors.forename: Takashi
authors.initials: T
authors.lastname: Shimada
authors.forename: Atsushi
authors.initials: A
authors.lastname: Okazawa
authors.forename: Norimichi
authors.initials: N
authors.lastname: Kojima
authors.forename: Shunsuke
authors.initials: S
authors.lastname: Yoshii
authors.forename: Hiroyuki
authors.initials: H
authors.lastname: Nojiri
authors.forename: Takayuki
authors.initials: T
authors.lastname: Ishida