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SUMMARY:Coordination Frameworks: New routes to multiferroics and low dimen
 sional magnetism - Paul Saines\, School of Physical Sciences\, University 
 of Kent.
DTSTART:20161130T111500Z
DTEND:20161130T121500Z
UID:TALK67983@talks.cam.ac.uk
CONTACT:Helen Verrechia
DESCRIPTION:Materials that respond to an electric or magnetic signal are c
 rucial to many modern technologies\, including data storage\, ultrasound s
 ensors and low temperature cooling. They also exhibit fascinating fundamen
 tal phenomena as seen by the awarding of the 2016 Nobel Prize for theoreti
 cal understanding of topological phases Most materials of interest for the
 se applications are complex metal oxides but\, after decades of research\,
  they still struggle to incorporate all features required to optimise comp
 lex functional properties or exhibit purely low dimensional behaviour. Rec
 ently new classes of materials that contain both inorganic and organic bui
 lding blocks have attracted attention for their ability to exhibit such ma
 gnetic and electronic functionalities. These include coordination framewor
 ks where transition metal or lanthanide cations are connected together by 
 organic ligands to make extended structures. The tremendous choice of buil
 ding blocks for such materials provide enormous flexibility to tailor thei
 r properties for particular applications\, while the unique structures the
 y adopt allow properties to be varied in ways not possible in conventional
  ferroic materials.  This includes well-isolated low dimensional structure
 s well suited to low dimensional magnetism. The origins of these propertie
 s in the atomic level structure and dynamics of frameworks is\, however\, 
 currently obscured. Our group’s focus is to develop a fundamental unders
 tanding of the microscopic origins of these properties in frameworks and u
 se this to develop design rules for improved properties. Recent examples o
 f this include probing the magnetic and ferroelectric ordering of ternary 
 transition metal frameworks that exhibit both ferroelectric and magnetic o
 rder to uncover unique trends in their magnetic structure and unusual orig
 ins for relaxor ferroelectric type behaviour. We will also discuss low dim
 ensional magnetism in a terbium framework\, whose magnetocaloric cooling e
 ffect is larger than its gadolinium analogue due to the 1D ferromagnetic c
 oupling in its paramagnetic phase. This compound also undergoes a transiti
 on to a state that appears to have 1D long-range magnetic order\, albeit i
 ncomplete\, supported by the short-range antiferromagnetic coupling betwee
 n chains on a frustrated triangular lattice. 
LOCATION:Mott Seminar Room (531)\, Cavendish Laboratory\, Department of Ph
 ysics
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