#
# arev:/usr/local/unicat/unireq/beamreq/req00069.txt
# UNICAT Member Beam Time Request  #69

# created Tue Jun 29 15:27:43 CDT 1999
#

days:
	5

description:
	We recently completed the introductory experiment to study the 
	magnetic x-ray scattering in K2ReBr6.  We found clear evidence of
	magnetic scattering at the Re LIII and LII edges.  We quickly 
	searched for scattering at the LI edge and the Br K edge but
	saw no clear evidence.  The experiment was somewhat limited by
	the geometry used and could clearly be enhanced by use of an extended
	face geometry with a cleaved and polished crystal.  These things
	are already being discussed and can be easily performed here 
	at ORNL to have a sample ready for the next cycle of user beamtime.
	
	In addition, we still would like to perform scattering (both 
	magnetic resonant and non-magnetic) studies of the metal-insulator
	transition in Cd2Os2O7.  This system has a metal-insulator transition
	at 225K and the hypothesis is that this transition is not accompanied
	by a structural tranformation.  We could carefully measure lattice
	constant changes in an attempt to observe any structural changes 
	at this transition temperature.  In addition, susceptibility 
	measurements suggest that this transition has peculiar magnetic 
	properties and we would like to perform a search for some magnetic
	scattering.

equipment+required:
	displex

experiment:
	MagneticX-ray scattering study of K2ReBr6 and/or Cd2Os2O7

hazards:
	Cd2Os2O7 is slightly toxic

name:
	Mark Lumsden / Stephen Nagler

nonmembers:
	

station:
	33ID-D

unacceptable+dates:
	all should be fine



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