Charge transport and magnetization profile at the interface between the correlated metal CaRuO3 and the antiferromagnetic insulator CaMnO3

Journal Article · Fri Jan 01 00:00:00 EST 2010 · Physical Review B

DOI:https://doi.org/10.1103/PhysRevB.81.094414· OSTI ID:992518

Freeland, J. W. ^[1]; Chakhalian, J. ^[2]; Boris, A. V. ^[3]; Tonnerre, J. -M. ^[4]; Kavich, J. J. ^[5]; Yordanov, P. ^[3]; Grenier, S. ^[6]; Lee, Ho Nyung ^[7]; Keimer, Bernhard ^[3]

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1. Argonne National Laboratory (ANL)
2. University of Arkansas
3. Max-Planck-Institut fur Feskorperforschung, Stuttgart, Germany
4. CNRS, France
5. University of Illinois, Chicago
6. CNRS, Grenoble, France
7. ORNL

A combination of spectroscopic probes was used to develop a detailed experimental description of the transport and magnetic properties of superlattices composed of the paramagnetic metal CaRuO3 and the antiferromagnetic insulator CaMnO3. The charge carrier density and Ru valence state in the superlattices are not significantly different from those of bulk CaRuO3. The small charge transfer across the interface implied by these observations confirms predictions derived from density functional calculations. However, a ferromagnetic polarization due to canted Mn spins penetrates 3-4 unit cells into CaMnO3, far exceeding the corresponding predictions. The discrepancy may indicate the formation of magnetic polarons at the interface.

• 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: 992518
• Journal Information: Physical Review B, Vol. 81, Issue 9; ISSN 1098-0121
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
CHARGE CARRIERS
CHARGE TRANSPORT
FUNCTIONALS
MAGNETIC PROPERTIES
MAGNETIZATION
POLARIZATION
POLARONS
PROBES
SUPERLATTICES
TRANSPORT
VALENCE