title: Investigation of the photoinduced magnetization of copper octacyanomolybdates nanoparticles by X-ray magnetic circular dichroism.
abstract: Through an extensive set of SQUID magnetic measurements, X-ray absorption spectroscopy, and X-ray magnetic circular dichroism, we have determined the nature of the metastable photomagnetic phase in the cyano-bridged 3D network Cs(2)Cu(7)[Mo(CN)(8)](4). The photomagnetic effect is induced by the photoconversion of Mo(IV) ions in low spin (LS) configuration (S = 0) into Mo(IV) ions in high spin (HS) configuration (S = 1). The magnetic and spectroscopic measurements fully support the LS to HS conversion, whereas the previously invoked charge transfer mechanism Mo(IV) + Cu(II) ⇒ Mo(V) + Cu(I) can be completely ruled out.
authors.affiliation: Institut de Minéralogie et de Physique des Milieux Condensés, CNRS UMR 7590, Université Pierre et Marie Curie, 4 place Jussieu, Case 115, 75252 Paris cedex 05, France.
authors.forename: Sophie
authors.initials: S
authors.lastname: Brossard
authors.forename: Florence
authors.initials: F
authors.lastname: Volatron
authors.forename: Laurent
authors.initials: L
authors.lastname: Lisnard
authors.forename: Marie-Anne
authors.initials: MA
authors.lastname: Arrio
authors.forename: Laure
authors.initials: L
authors.lastname: Catala
authors.forename: Corine
authors.initials: C
authors.lastname: Mathonière
authors.forename: Talal
authors.initials: T
authors.lastname: Mallah
authors.forename: Christophe Cartier
authors.initials: CC
authors.lastname: dit Moulin
authors.forename: Andrei
authors.initials: A
authors.lastname: Rogalev
authors.forename: Fabrice
authors.initials: F
authors.lastname: Wilhelm
authors.forename: Alevtina
authors.initials: A
authors.lastname: Smekhova
authors.forename: Philippe
authors.initials: P
authors.lastname: Sainctavit