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CALSCALE:GREGORIAN
PRODID:UW-Madison-Physics-Events
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SEQUENCE:0
UID:UW-Physics-Event-3182
DTSTART:20140221T213000Z
DURATION:PT1H0M0S
DTSTAMP:20260419T193544Z
LAST-MODIFIED:20140220T140240Z
LOCATION:2241 Chamberlin Hall (coffee at 4:30 pm)
SUMMARY:Equilibrium and Driven Mesoscopic Dynamics in Complex Oxides\,
  Physics Department Colloquium\, Paul Evans\, UW Materials Science & E
 ngineering
DESCRIPTION:Complex oxide materials can exhibit a wide range of proper
 ties that are both fundamentally important and widely useful.  The ele
 ctrical polarization of complex oxide ferroelectrics is particularly i
 nteresting because the energetics of long-range interactions due to el
 ectrostatics and elasticity compete with much shorter-range interactio
 ns associated with the formation of defects and domain boundaries.  Th
 is competition leads to a rich range of phenomena in nanoscale materia
 ls that are only now beginning to be explored.  We describe a series o
 f advances in experimental techniques based on the coherence and ultra
 fast time structure of synchrotron x-ray radiation that make it possib
 le to explore the dynamics of these materials in a new regime.  The co
 mpetition of polarization and domain wall energies in nanoscale superl
 attices composed of alternating ferroelectric and dielectric layers of
  atomic-scale thicknesses leads to the formation of polarization domai
 ns.  X-ray scattering show that these domains can be manipulated with 
 applied electric fields and that the complex energy landscape leads to
  fluctuations in their configuration at room temperature.  Future comb
 inations of ultrafast time resolution and precise structural studies e
 nabled by the spatial coherence of x-rays promise new insight into the
  dynamics of a wide range of other phenomena.
URL:https://www.physics.wisc.edu/events/?id=3182
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