Tunneling between the metallic antiferromagnetic and ferromagnetic phases of La(1-x)Sr(x)MnO3 near x=0.5 by digital synthesis

Journal Article · Thu Jan 01 04:00:00 EST 2009 · Physical Review B

DOI:https://doi.org/10.1103/PhysRevB.80.155114· OSTI ID:979288

Santos, Tiffany S. ^[1]; Robertson, Lee ^[2]; May, Stephen J. ^[1]; Bhattacharya, Anand ^[1]

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1. Argonne National Laboratory (ANL)
2. ORNL

We investigated cation-ordered La1 xSrxMnO3 about the half-doping level x 0.5 in superlattices of alternating, single unit-cell layers of LaMnO3 and SrMnO3. The effect of La/Sr cation order was addressed by comparing the structural, magnetic and transport properties of these superlattices with random alloy films of equivalent composition. The samples were synthesized by ozone-assisted molecular beam epitaxy onto SrTiO3 substrates. The superlattices could be tuned between ferromagnetic and antiferromagnetic metallic states by inserting extra single unit-cell layers of LaMnO3 and SrMnO3, respectively. For x < 0.5, a ferromagnetic, metallic phase was observed. For x = 0.50 and 0.55, A-type antiferromagnetic order was confirmed by neutron diffraction, with a N eel temperature of 300 K, significantly higher than bulk values. The enhanced N eel temperature was attributed to lattice strain rather than cation order.

• Research Organization: Oak Ridge National Laboratory (ORNL); High Flux Isotope Reactor
• Sponsoring Organization: SC USDOE - Office of Science (SC)
• DOE Contract Number: AC05-00OR22725
• OSTI ID: 979288
• Journal Information: Physical Review B, Journal Name: Physical Review B Journal Issue: 15 Vol. 80; ISSN 1098-0121
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALLOYS
CATIONS
MOLECULAR BEAM EPITAXY
NEUTRON DIFFRACTION
STRAINS
SUBSTRATES
SUPERLATTICES
SYNTHESIS
TRANSPORT
TUNNELING
antiferromagnetic
neutron scattering
tunneling