Size Effect on Local Magnetic Moments in Ferrimagnetic Molecular Complexes: An XMCD Investigation |
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Authors: | Guillaume Champion Marie-Anne Arrio Philippe Sainctavit Michele Zacchigna Marco Zangrando Marco Finazzi Fulvio Parmigiani Françoise Villain Corine Mathonière Christophe Cartier dit Moulin |
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Institution: | (1) Laboratoire de Chimie Inorganique et Matériaux Moléculaires, Université Pierre et Marie Curie, 4 place Jussieu, F-75252 Paris cedex 05, France, FR;(2) Laboratoire pour l’Utilisation du Rayonnement Electromagnétique, BP34, Université Paris-Sud, F-91898 Orsay cedex, France, FR;(3) Laboratoire de Minéralogie Cristallographie de Paris, Universités Paris 6 et 7, 4 place Jussieu, F-75252 Paris cedex 05, France, FR;(4) Laboratorio TASC, INFM c/o Sincrotrone Trieste, S.S. 14 Km. 163.5, I-34012 Basovizza, Trieste, Italy, IT;(5) INFM-TASC, Trieste and Catholic University, Dept. of Mathematic and Physics, I-25121 Brescia, Italy, IT;(6) Institut de Chimie de la Matière Condensée, 87, Avenue du Docteur Schweitzer, F-33608 Pessac cedex, France, FR |
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Abstract: | Summary. Molecular chemistry allows to synthesize new magnetic systems with controlled properties such as size, magnetization or anisotropy.
The theoretical study of the magnetic properties of small molecules (from 2 to 10 metallic cations per molecule) predicts
that the magnetization at saturation of each ion does not reach the expected value for uncoupled ions when the magnetic interaction
is antiferromagnetic. The quantum origin of this effect is due to the linear combination of several spin states building the
wave function of the ground state and clusters of finite size and of finite spin value exhibit this property. When single
crystals are available, spin densities on each atom can be experimentally given by Polarized Neutron Diffraction (PND) experiments.
In the case of bimetallic MnCu powdered samples, we will show that X-ray Magnetic Circular Dichroism (XMCD) spectroscopy can
be used to follow the evolution of the spin distribution on the MnII and CuII sites when passing from a dinuclear MnCu unit to a one dimensional (MnCu)
n
compound.
Corresponding author. E-mail: Christophe.Cartier@lure.u-psud.fr
Received September 4, 2002; accepted September 6, 2002 |
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Keywords: | , X-ray absorption spectroscopy (XAS), XMCD, Quantum size effect, |
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