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DTSTAMP:20220505T221514Z
UID:EF86312E-BC4A-41D4-A64B-C1A292D56CC0
DTSTART;TZID=America/Denver:20220415T110000
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DESCRIPTION:Mesoscale phenomena play an important role in the dynamics of p
 hase transitions in complex oxides. In order to fully understand and tailo
 r nanoscale functionalities of strongly correlated oxides\, detailed acces
 s to the nanoscale regime\, correlation length scales and their temporal e
 volution is required. Coherent x-ray scattering at synchrotron sources hav
 e emerged as a unique technique to access both nanoscale lengthscales and 
 fundamental timescales. Higher brightness\, and coherence enabled by upcom
 ing new sources such as NSLS-II\, APS upgrade and ALS upgrade\, provide a 
 novel way to investigate material dynamics and fluctuations at fundamental
  limits of lengthscales and timescales. In this talk\, I will discuss adva
 nced synchrotron characterization techniques used by my group to investiga
 te nanoscale properties of complex oxides heterostructures. The first part
  of my talk will focus on Gd/La0.67Sr0.33CoO3 (LSCO) heterostructures\, wh
 ich have shown promises for magneto-ionic control of functional properties
  through the presence of oxygen getter layers such as Gd. We have utilized
  x-ray nanodiffraction to directly image the nanoscale morphology of LSCO 
 thin films as they are progressively transformed from the equilibrium pero
 vskite phase to the metastable brownmillerite (BM) phase with increasing G
 d and Al thickness. The second part of my talk will focus on temporal evol
 ution of domain fluctuations and dynamics in BaTiO3 thin films\, an archet
 ypical ferroelectric material. By using coherent x-ray scattering techniqu
 e\, we compare domain fluctuations between second and first order phase tr
 ansition in this material. The significant influence of heterogeneities on
  pathways of transition in both systems show the importance of nanoscale s
 tudies in correlated material systems.\n\nCo-sponsored by: UCCS\n\nSpeaker
 (s): Roopali Kukreja\, \n\nRoom: A204\, Bldg: Osborne Center for Science a
 nd Engineering\, 1420 Austin Bluffs Pkwy\, Colorado Springs\, Colorado\, U
 nited States\, 80918\, Virtual: https://events.vtools.ieee.org/m/311591
LOCATION:Room: A204\, Bldg: Osborne Center for Science and Engineering\, 14
 20 Austin Bluffs Pkwy\, Colorado Springs\, Colorado\, United States\, 8091
 8\, Virtual: https://events.vtools.ieee.org/m/311591
ORGANIZER:dbozhko@uccs.edu
SEQUENCE:5
SUMMARY:Understanding nanoscale correlations in complex oxide heterostructu
 res
URL;VALUE=URI:https://events.vtools.ieee.org/m/311591
X-ALT-DESC:Description: <br /><p>Mesoscale phenomena play an important role
  in the dynamics of phase transitions in complex oxides. In order to fully
  understand and tailor nanoscale functionalities of strongly correlated ox
 ides\, detailed access to the nanoscale regime\, correlation length scales
  and their temporal evolution is required. Coherent x-ray scattering at sy
 nchrotron sources have emerged as a unique technique to access both nanosc
 ale lengthscales and fundamental timescales. Higher brightness\, and coher
 ence enabled by upcoming new sources such as NSLS-II\, APS upgrade and ALS
  upgrade\, provide a novel way to investigate material dynamics and fluctu
 ations at fundamental limits of lengthscales and timescales. In this talk\
 , I will discuss advanced synchrotron characterization techniques used by 
 my group to investigate nanoscale properties of complex oxides heterostruc
 tures. The first part of my talk will focus on Gd/La0.67Sr0.33CoO3 (LSCO) 
 heterostructures\, which have shown promises for magneto-ionic control of 
 functional properties through the presence of oxygen getter layers such as
  Gd. We have utilized x-ray nanodiffraction to directly image the nanoscal
 e morphology of LSCO thin films as they are progressively transformed from
  the equilibrium perovskite phase to the metastable brownmillerite (BM) ph
 ase with increasing Gd and Al thickness. The second part of my talk will f
 ocus on temporal evolution of domain fluctuations and dynamics in BaTiO3 t
 hin films\, an archetypical ferroelectric material. By using coherent x-ra
 y scattering technique\, we compare domain fluctuations between second and
  first order phase transition in this material. The significant influence 
 of heterogeneities on pathways of transition in both systems show the impo
 rtance of nanoscale studies in correlated material systems.</p>
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