Orbital mixing and nesting in the bilayer manganites La{sub 2-2x}Sr{sub 1+2x}Mn{sub 2}O{sub 7}.

Journal Article · Tue Jan 01 00:00:00 EST 2008 · Phys. Rev. Lett.

DOI:https://doi.org/10.1103/PhysRevLett.101.236402· OSTI ID:944036

Saniz, R; Norman, M R; Freeman, A J

A first principles study of La{sub 2-2x}Sr{sub 1+2x}Mn{sub 2}O{sub 7} compounds for doping levels 0.3 {le} x {le} 0.5 shows that the low energy electronic structure of the majority spin carriers is determined by strong momentum-dependent interactions between the Mn e{sub g} d{sub x{sup 2}-y{sup 2}} and d{sub 3z{sup 2}-r{sup 2}} orbitals, which, in addition to an x-dependent Jahn-Teller distortion, differ in the ferromagnetic and antiferromagnetic phases. The Fermi surface exhibits nesting behavior that is reflected by peaks in the static susceptibility, whose positions as a function of momentum have a nontrivial dependence on x.

• Research Organization: Argonne National Lab. (ANL), Argonne, IL (United States)
• Sponsoring Organization: USDOE Office of Science (SC)
• DOE Contract Number: DE-AC02-06CH11357
• OSTI ID: 944036
• Report Number(s): ANL/MSD/JA-62263; PRLTAO; TRN: US200902%%510
• Journal Information: Phys. Rev. Lett., Vol. 101, Issue 2008; ISSN 0031-9007
• Country of Publication: United States
• Language: ENGLISH

Related Subjects

36 MATERIALS SCIENCE
LANTHANUM OXIDES
STRONTIUM OXIDES
MANGANESE OXIDES
ELECTRONIC STRUCTURE
FERMI LEVEL
SPIN
DOPED MATERIALS
JAHN-TELLER EFFECT
PHASE STUDIES