Charge and spin ordering in La{sub 2{minus}{ital x}}Sr{sub {ital x}}NiO{sub 4.00} with {ital x}=0.135 and 0.20
- Department of Chemical Engineering, University of Delaware, Newark, Delaware 19716 (United States)
- Physics Department, Brookhaven National Laboratory, Upton, New York 11973 (United States)
We report neutron-scattering experiments that reveal coupled incommensurate peaks arising from magnetic as well as charge ordering at low temperatures ({ital T}{le}100 K) in stoichiometric La{sub 2{minus}{ital x}}Sr{sub {ital x}}NiO{sub 4+{delta}} ({delta}=0.00) crystals. In contrast with the long-range ordering of holes and spins observed recently in La{sub 2}NiO{sub 4.125}, the correlations are short ranged in Sr-doped La{sub 2}NiO{sub 4} and the incommensurability {var_epsilon} is 0.25 and 0.12 for {ital x}=0.20 and 0.135, respectively. Based on our study and previous reports on La{sub 2{minus}{ital x}}Sr{sub {ital x}}NiO{sub 4+{delta}}, the modulation wave vector appears to be a sensitive function of net hole concentration, {ital p}={ital x}+2{delta}. The magnetic correlation length increases with doping and the incommensurability follows the simple relationship {var_epsilon}{approx}{ital p}.
- Research Organization:
- Brookhaven National Laboratory
- DOE Contract Number:
- AC02-76CH00016
- OSTI ID:
- 44579
- Journal Information:
- Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 18 Vol. 51; ISSN PRBMDO; ISSN 0163-1829
- Country of Publication:
- United States
- Language:
- English
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