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VERSION:2.0
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BEGIN:VEVENT
DTSTAMP:20261021T123158Z
LAST-MODIFIED:20131107T203512Z
DTSTART:20131120T200000Z
DTEND:20131120T210000Z
UID:event1183@bu.edu
URL:http://physics.bu.edu/internal/events/show/1183
SUMMARY:Band Structure and Crystal-Field Excitations of La1-xLuxVO3 Crystal
	s Studied by Soft X-ray Spectroscopies
DESCRIPTION:Featuring Bo Chen\n\nPart of the Departmental Seminars.\n\nDiss
	ertation Committee: Kevin Smith\, Richard Averitt\, Karl Ludwig\, Anders Sa
	ndvik\, and Scott Whitaker\n\nAbstract:\n\nThe rare-earth orthovanadates\, 
	RVO3\, offer a fascinating phase diagram with both orbital- and spin-orderi
	ng phenomena\, owing to their two-fold electron occupations of the triply d
	egenerate V t2g orbitals. Their spin-orbital phase diagram was found to evo
	lve with temperature\, R-site ionic size\, and R-site substitution\, and ex
	hibit switching between different patterns of spin and orbital order. In or
	der to understand these effects of the rare-earth ionic size and the orbita
	l ordering\, we report a soft x-ray spectroscopic study of the electronic s
	tructure of Lu1-xLaxVO3 single-crystals\, which approach both the smallest 
	and largest rare-earth ionic radii. The x-ray absorption (XAS) and emission
	 (XES) spectra at the O K-edge\, which probe both the unoccupied and occupi
	ed O 2p partial density of states\, closely measure the O 2p-V 3d hybridiza
	tion and reveal the strong dependence of the O 2p-R 5d hybridization with t
	emperature and R-site cation. Good agreement is obtained between the experi
	mental spectra at the O K-edge and the theoretical O 2p PDOS calculated wit
	hin the local spin density approximation [L(S)DA]\, including the static Co
	ulomb repulsion parameter\, U\, self-consistently (LSDA+U). Moreover\, the 
	resonant inelastic x-ray scattering spectra (RIXS) at the V L3-edge\, which
	 probe the intra-site dd* transitions\, directly measure the 3d orbital spl
	itting of single vanadium-site as a function of temperature and R-site ioni
	c size. Together\, these combined spectroscopic techniques provide a detail
	ed study of the band structure and the crystal-field excitations of Lu1-xLa
	xVO3 with varied R-site ionic radius during phase transitions.
LOCATION:PRB 261\, 3 Cummington Mall\, 02215
STATUS:CONFIRMED
CLASS:PUBLIC
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