title: Magnetic polarization of the americium J=0 ground state in AmFe(2).
abstract: Trivalent americium has a nonmagnetic (J=0) ground state arising from the cancellation of the orbital and spin moments. However, magnetism can be induced by a large molecular field if Am^{3+} is embedded in a ferromagnetic matrix. Using the technique of x-ray magnetic circular dichroism, we show that this is the case in AmFe_{2}. Since ⟨J_{z}⟩=0, the spin component is exactly twice as large as the orbital one, the total Am moment is opposite to that of Fe, and the magnetic dipole operator ⟨T_{z}⟩ can be determined directly; we discuss the progression of the latter across the actinide series.
authors: European Commission, Joint Research Centre (JRC), Institute for Transuranium Elements (ITU), Postfach 2340, D-76125 Karlsruhe, Germany.
authors: N
authors: N
authors: Magnani
authors: European Commission, Joint Research Centre (JRC), Institute for Transuranium Elements (ITU), Postfach 2340, D-76125 Karlsruhe, Germany.
authors: R
authors: R
authors: Caciuffo
authors: European Synchrotron Radiation Facility (ESRF), Boîte Postale 220, F-38043 Grenoble, France.
authors: F
authors: F
authors: Wilhelm
authors: European Commission, Joint Research Centre (JRC), Institute for Transuranium Elements (ITU), Postfach 2340, D-76125 Karlsruhe, Germany.
authors: E
authors: E
authors: Colineau
authors: European Commission, Joint Research Centre (JRC), Institute for Transuranium Elements (ITU), Postfach 2340, D-76125 Karlsruhe, Germany.
authors: R
authors: R
authors: Eloirdi
authors: European Commission, Joint Research Centre (JRC), Institute for Transuranium Elements (ITU), Postfach 2340, D-76125 Karlsruhe, Germany.
authors: J-C
authors: JC
authors: Griveau
authors: Department of Physics and Astronomy, Uppsala University, P.O. Box 516, S-75120 Uppsala, Sweden.
authors: J
authors: J
authors: Rusz
authors: Department of Physics and Astronomy, Uppsala University, P.O. Box 516, S-75120 Uppsala, Sweden.
authors: P M
authors: PM
authors: Oppeneer
authors: European Synchrotron Radiation Facility (ESRF), Boîte Postale 220, F-38043 Grenoble, France.
authors: A
authors: A
authors: Rogalev
authors: European Commission, Joint Research Centre (JRC), Institute for Transuranium Elements (ITU), Postfach 2340, D-76125 Karlsruhe, Germany.
authors: G H
authors: GH
authors: Lander