Incommensurate charge stripe ordering in La{sub 2-x}Sr{sub x}NiO{sub 4} for x=(0.33,0.30,0.275)

Journal Article · Fri Oct 01 04:00:00 EDT 2004 · Physical Review. B, Condensed Matter and Materials Physics

DOI:https://doi.org/10.1103/PhysRevB.70.144507· OSTI ID:20664916

Ghazi, M E; Spencer, P D; Wilkins, S B; Hatton, P D; Mannix, D; Prabhakaran, D; Boothroyd, A T; Cheong, S -W ^[1]

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1. Physics Department, Shahrood University of Technology, Shahrood, P.O. Box 36155-316 (Iran, Islamic Republic of)

In this paper we report studies of the charge stripe ordering using high resolution x-ray scattering in the nickelate system La{sub 2-x}Sr{sub x}NiO{sub 4} with doping levels of x=0.33, x=0.30, and x=0.275. The charge stripes for all doping levels were found to be two dimensional in nature with a high degree of correlation in the a-b plane. The in-plane inverse correlation length in the lower doped systems was greater than that in the x=0.33 system and is greatest for x=0.275, consistent with the stripes becoming less correlated as the doping level is decreased from x=0.33. However, the charge ordering in the x=0.33 system was observed to be more two dimensional in nature with a greater inverse correlation length between planes. The interaction between the lattice and charge order was observed to stabilize the charge ordering, even in the absence of spin ordering. In the x=0.30 and x=0.275 systems no long-range charge order could exist without the presence of the magnetic order. In both systems the charge stripes were incommensurate and on heating the incommensurability increased towards the stable {epsilon}=0.33 value as the stripes gained thermal energy to overcome the Coulombic repulsion. In all these systems the integrated intensity of the stripe reflections showed a clear difference in behavior from previous neutron studies with an initial increase in the integrated intensity as the temperature was increased, which was not found in the neutron studies.

• OSTI ID: 20664916
• Journal Information: Physical Review. B, Condensed Matter and Materials Physics, Journal Name: Physical Review. B, Condensed Matter and Materials Physics Journal Issue: 14 Vol. 70; ISSN 1098-0121
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
DOPED MATERIALS
HEATING
INTERACTIONS
LANTHANUM COMPOUNDS
NEUTRONS
NICKEL COMPOUNDS
ORDER-DISORDER TRANSFORMATIONS
OXIDES
REFLECTION
SPIN
STRONTIUM COMPOUNDS
X-RAY DIFFRACTION