Charge states and magnetic ordering in LaMnO3/SrTiO3 superlattices

Journal Article · Sat Jan 01 00:00:00 EST 2011 · Physical Review B

DOI:https://doi.org/10.1103/PhysRevB.83.195113· OSTI ID:1015694

Choi, W. S. ^[1]; Jung, D. W. ^[1]; Seo, Sung Seok A ^[2]; Lee, Y. S. ^[3]; Kim, T. H. ^[1]; Jang, S. Y. ^[1]; Lee, Ho Nyung ^[2]; Myung-Whun, Kim ^[4]

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1. Seoul National University
2. ORNL
3. Soongsil University, Korea
4. Chonbuk National University

We investigated the magnetic and optical properties of [(LaMnO{sub 3}){sub n}/(SrTiO{sub 3}){sub 8}]{sub 20} (n = 1, 2, and 8) superlattices grown by pulsed-laser deposition. We found that a weak ferromagnetic and semiconducting state developed in all superlattices. An analysis of the optical conductivity showed that the LaMnO{sub 3} layers in the superlattices were slightly doped. The amount of doping was almost identical regardless of the LaMnO{sub 3} layer thickness up to eight unit cells, suggesting that the effect is not limited to the interface. On the other hand, the magnetic ordering became less stable as the LaMnO{sub 3} layer thickness decreased, probably due to a dimensional effect.

• Research Organization: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
• Sponsoring Organization: USDOE Office of Science (SC)
• DOE Contract Number: DE-AC05-00OR22725
• OSTI ID: 1015694
• Journal Information: Physical Review B, Vol. 83, Issue 19; ISSN 1098--0121
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
CHARGE STATES
DEPOSITION
OPTICAL PROPERTIES
SUPERLATTICES
THICKNESS