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Absence of Long-Ranged Charge Order in NaxCa2-xCuO2Cl2 (x=0.08)

Journal Article · · Physical Review, B: Condensed Matter
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Recent scanning-tunneling spectroscopy (STS) studies of the cupric oxychloride Na{sub x}Ca{sub 2-x}CuO{sub 2}Cl{sub 2} (NCCOC) have uncovered a periodic 4a x 4a density of states (DOS) modulation, termed a 'checkerboard' (T. Hanaguri et al., Nature (London) 430, 1001 (2004)). The periodicity of this phase is the same as that of the 'stripe' charge order observed with neutron scattering in the very similar systems La{sub 1.48}Nd{sub 0.4}Sr{sub 0.12}CuO{sub 4} (LNSCO). This raises the question of whether the stripes are, in fact, actually checkerboards. Unfortunately, NCCOC samples are very small and LBCO and LNSCO samples do not cleave, so neutron and STS measurements cannot be carried out on the same system. To determine the relationship between stripes and checkers, we used resonant soft-x-ray scattering, previously applied to LBCO, to study single crystals of NCCOC. No evidence was seen for a 4a x 4a DOS modulation, indicating that the checkerboard effect is not directly related to the stripe modulation in LBCO. We place an upper bound on the product of the charge amplitude and the square of the in-plane correlation length of 2.3 x 10{sup 3} hole {angstrom}{sup 2}. Our measurements suggest that the checkers in NCCOC are either glassy or are nucleated by the surface, as suggested by Brown et al.

Research Organization:
Brookhaven National Laboratory (BNL) National Synchrotron Light Source
Sponsoring Organization:
Doe - Office Of Science
DOE Contract Number:
AC02-98CH10886
OSTI ID:
930630
Report Number(s):
BNL--80983-2008-JA
Journal Information:
Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Vol. 75; ISSN PRBMDO; ISSN 0163-1829
Country of Publication:
United States
Language:
English

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Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
AMPLITUDES
MODULATION
NEUTRONS
OXYCHLORIDES
PERIODICITY
SCATTERING
SPECTROSCOPY
national synchrotron light source