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VERSION:2.0
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BEGIN:VEVENT
DTSTAMP:20260730T125335Z
LAST-MODIFIED:20121116T203436Z
DTSTART:20111214T200000Z
DTEND:20111214T210000Z
UID:event161@bu.edu
URL:http://physics.bu.edu/internal/events/show/161
SUMMARY:Growth and X-Ray Spectroscopy Studies of Correlated Vanadium Oxides
DESCRIPTION:Featuring Bo Chen\n\nPart of the Preliminary Oral Exam.\n\nExam
	ining Committee:  Kevin Smith\, Richard Averitt\, Linda Doerrer\, Xi L
	in\, Scott Whitaker\n \nAbstract:\nThe electronic structure of correla
	ted electron systems has been one of the most interesting topics in condens
	ed matter physics\, due to their complex and fascinating properties along w
	ith technological applications. Vanadium oxides are prototypical correlated
	 materials\, which show the rich properties of metal-insulator transition (
	MIT)\, as well as charge ordering transitions\, structural and magnetic pha
	se transitions. The vanadium-oxide samples in this study are synthesized by
	 different techniques of crystal growth\, sol-gel process\, and vacuum depo
	sition to obtain various forms of single crystals\, polycrystalline and epi
	taxial films with doping. Our experimental tools of measuring the electroni
	c structure are synchrotron-based x-ray spectroscopies\, including soft x-r
	ay emission spectroscopy (XES)\, soft x-ray absorption spectroscopy (XAS)\,
	 resonant inelastic soft x-ray scattering (RIXS)\, x-ray photoemission spec
	troscopy (XPS)\, and angle resolved photoemission spectroscopy (ARPES). The
	 XAS\, XES\, and XPS study on the electronic structure of NaxV2O5 (x ~ 0.33
	) polycrystalline films has shown good β-phase crystal structure with 
	Na doping\, which is promising for displaying the property of MIT with char
	ge ordering in the future study. To test theories about the orbital orderin
	g in rare-earth vanadates\, RVO3\, with varied rare-earth ionic sizes durin
	g phase transitions as temperature changes\, V L-edge RIXS has been applied
	 to probe the O 2p-V 3d* charge transfer excitations and V 3d-3d* transitio
	ns in Lu1-xLaxVO3 single crystals.
LOCATION:SCI 352\, 590 Commonwealth Avenue\, 02215
STATUS:CONFIRMED
CLASS:PUBLIC
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