####################################################
# Takeshi Egami <egami@utk.edu>
# requesting 7 days, at minimum=5 days
# beamline 33ID, Electronic inhomogeneity in cuprates
# instrument 33ID-D kappa
####################################################
# top:/home/www/beamtime-requests/req00692.txt
# UNICAT Member Beam Time Request  #692
# created Fri Dec 03 16:41:01 CST 2004
####################################################

apsrun:
	2005-01

beamline:
	33ID

collaboration:
	No

collaborator_Paul:
	ON

collaborator_Pete:
	ON

contact:
	egami@utk.edu

days:
	7

description:
	Diffuse scattering from a single crystal YBa(2)Cu(4)O(8) (YBCO-124)will be studied as a function of energy in the vicinity of the Cu K-edge to determine the electronic inhomogeneity in the system. This is equivalent to the XANES, but with the q-resolution to determine the spatial variation in the electronic structure. Our earlier attempts showed that the changes are small but observable. The real part of the anomalous scattering changed appreciably above and below q = 0.2, suggesting that the electronic structure appears to have inhomogeneity at the lengthscale five times the lattice constant, in agreement with the STM studies on BSCCO.  Since YBCO-124 is stoichiometric, this implies intrinsic inhomogeneity. The issue of electronic inhomogeneity in superconducting cuprate is a major unresolved issue that directly pertains to the question of the nature of the pseudo-gap phase and the mechanism of superconductivity.

equipment_required:
	Displex.

experiment:
	Electronic inhomogeneity in cuprates

foreign_nationals:
	Ferenc Stercel (U. Penn), Maxim Lobanov (UTK), Wojtek Dmowski (UTK), Jin Nakamura (UTK).

hazards:
	None.

instrument:
	33ID-D kappa

instrument_other:
	

minimumdays:
	5

name:
	Takeshi Egami

nonmembers:
	

unacceptable_dates:
	Feb. 7-16,  Mar. 20-26,

z34ID_details:
	


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