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Lecture Serena Margadonna

Roster

WhenWhere
05 July 2005 FWN-Building 5113.0201, Nijenborgh 4, 9747 AG, Groningen
Speaker: Serena Margadonna
Affiliation: School of Chemistry and Centre for Science at Extreme Conditions, University of Edinburgh, UK
Title: Atypical responses of Prussian blue analogues to external stimuli
Date: Tue Jul 5, 2005
Start: 9.30
Location: FWN-Building 5113.0201
Host: P. Rudolf
Telephone: +31 50 363 4736 / 4974 (secr.)

Abstract

The exploration of the effects of external perturbations (temperature, pressure, magnetic and electric fields, light irradiation) on the structural, electronic and magnetic properties of materials is a key area of research in contemporary physics. In particular, photoinduced switching between the available spin and charge states in multistable molecular systems has attracted particular interest in view of the potential applications in magneto-optical switching and memory devices. An important class of switchable systems exhibiting multistability is the family of mixed valence transition metal cyanides (Prussian blue analogues, e. AMIIM'III(CN)6.nH2O, A = alkali metal; M = Fe, Mn, M' = Fe, Cr, Co) in which photo-induced metal-to-metal charge transfer can be accompanied by a simultaneous change in both the spin states of the molecular units and the bulk lattice properties. Our recent work showed that by exposing such systems to visible or X-ray light, a plethora of phase transitions with widely varying relaxation times (resulting from the strong coupling of the magnetic, lattice and electronic degrees of freedom) can occur and new phases with drastically changed structural, electronic and magnetic properties can be isolated. Here I will discuss the properties of these photo-induced phases drawing representative examples from our results on three different polycyanides (i) RbMn[Fe(CN)6], (ii) Fe[Co(CN)6] and (iii) RbMn[Cr(CN)6].
Last modified:22 October 2012 2.30 p.m.