Electronic Reconstruction at<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>SrMnO</mml:mi><mml:mn>3</mml:mn></mml:msub><mml:mtext mathvariant="normal">−</mml:mtext><mml:msub><mml:mi>LaMnO</mml:mi><mml:mn>3</mml:mn></mml:msub></mml:math>Superlattice Interfaces

Smadici, S.; Abbamonte, Peter; Bhattacharya, Anand; Zhai, Xiaofang; Jiang, Bin; Rusydi, Andrivo; Eckstein, J. N.; Bader, S. D.; Zuo, Jian‐Min

doi:10.1103/physrevlett.99.196404

Cited by 161 publications

(139 citation statements)

References 25 publications

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“…Characteristic length scales over which such charge transfer mechanisms occur have been determined in other perovskite systems, such as SrTiO3/LaTiO3 [32] and LaMnO3/SrMnO3 [33] and typically range in the order of a few unit cells, consistent with our observations. The interfacially-induced valence changes effectively push the LSMO system towards the case of higher Sr doping (yielding a FM metal with decreased TC).…”

Section: /17supporting

confidence: 80%

Competing interactions in ferromagnetic/antiferromagnetic perovskite superlattices

et al. 2009

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Soft x-ray magnetic dichroism, magnetization, and magnetotransport measurements demonstrate that the competition between different magnetic interactions (exchange coupling, electronic reconstruction, and long-range interactions) in La0.7Sr0.3FeO3 (LSFO) / La0.7Sr0.3MnO3 (LSMO) perovskite oxide superlattices leads to unexpected functional properties. The antiferromagnetic order parameter in LSFO and ferromagnetic order parameter in LSMO show a dissimilar dependence on sublayer thickness and temperature, illustrating the high degree of tunability in these artificially-layered materials.

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Section: /17supporting

confidence: 80%

Competing interactions in ferromagnetic/antiferromagnetic perovskite superlattices

et al. 2009

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“…Furthermore, the requirements for interface abruptness are extremely challenging. A variety of state of the art probes of the local electronic structure (electron energy loss spectroscopy, 10 resonant x-ray scattering, 102 tomography, 103 etc.) generically find that the length-scale for charge transfer is ~ 1 nm.…”

Section: Discussionmentioning

confidence: 99%

Emergent phenomena at oxide interfaces

et al. 2012

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BASIC NOTIONSTransition metal oxides (TMOs) are an ideal arena for the study of electronic correlations because the s-electrons of the transition metal ions are removed and transferred to oxygen ions, and hence the strongly correlated d-electrons determine their physical properties such as electrical transport, magnetism, optical response, thermal conductivity, and superconductivity. These electron correlations prohibit the double occupancy of metal sites and induce a local entanglement of charge, spin, and orbital degrees of freedom. This gives rise to a variety of phenomena, e.g., Mott insulators, various charge/spin/orbital orderings, metal-insulator transitions, multiferroics, and superconductivity. 1 In recent years, there has been a burst of activity to manipulate these phenomena, as well as create new ones, using oxide heterostructures. 2 Most fundamental to understanding the physical properties of TMOs is the concept of symmetry of the order parameter. As Landau recognized, the essence of phase transitions is the change of the symmetry. For example, ferromagnetic ordering breaks the rotational symmetry in spin space, i.e., the ordered phase has lower symmetry than the Hamiltonian of the system. There are three most important symmetries to be considered here. (i) Spatial inversion (I), defined as r  -r. In the case of an insulator, breaking this symmetry can lead to spontaneous electric SLAC-PUB-14626 SIMES,

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“…1, could be ferromagnetic ͑FM͒ along all directions, ferromagnetic in the xy plane and antiferromagnetic normal to the plane or antiferromagnetic in the plane and ferromagnetic normal to the plane depending on the composition of the parent compounds and epitaxial strain on the interface. [1][2][3][4][5][6] The epitaxial strain, arising due to lattice mismatch between the constituent compounds of the superlattice and the substrate, induces anisotropic hopping between orbitals to cause orbital ordering at the interface. By varying the strain condition the orbital ordering changes which in turn changes the magnetic ordering at the interface.…”

Section: Introductionmentioning

confidence: 99%

Effects of strain on orbital ordering and magnetism at perovskite oxide interfaces:LaMnO3/SrMnO3

Nanda

Satpathy

2008

Phys. Rev. B

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We study how strain affects orbital ordering and magnetism at the interface between SrMnO 3 and LaMnO 3 from density-functional calculations and interpret the basic results in terms of a three-site Mn-O-Mn model. Magnetic interaction between the Mn atoms is governed by a competition between the antiferromagnetic superexchange of the Mn t 2g core spins and the ferromagnetic double exchange of the itinerant e g electrons. While the core electrons are relatively unaffected by the strain, the orbital character of the itinerant electron is strongly affected, which in turn causes a large change in the strength of the ferromagnetic double exchange. The epitaxial strain produces the tetragonal distortion of the MnO 6 octahedron, splitting the Mn e g states into x 2 − y 2 and 3z 2 − 1 states, with the former being lower in energy, if the strain is tensile in the plane and opposite if the strain is compressive. For the case of the tensile strain, the resulting higher occupancy of the x 2 − y 2 orbital enhances the in-plane ferromagnetic double exchange owing to the larger electron hopping in the plane, causing at the same time a reduction in the out-of-plane double exchange. This reduction is large enough to be overcome by antiferromagnetic superexchange, which wins to produce a net antiferromagnetic interaction between the out-of-plane Mn atoms. For the case of the in-plane compressive strain, the reverse happens, viz., that the higher occupancy of the 3z 2 − 1 orbital results in the out-of-plane ferromagnetic interaction, while the in-plane magnetic interaction remains antiferromagnetic. Concrete density-functional results are presented for the ͑LaMnO 3 ͒ 1 / ͑SrMnO 3 ͒ 1 and ͑LaMnO 3 ͒ 1 / ͑SrMnO 3 ͒ 3 superlattices for various strain conditions.

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Electronic Reconstruction atSrMnO3−LaMnO3Superlattice Interfaces

Cited by 161 publications

References 25 publications

Competing interactions in ferromagnetic/antiferromagnetic perovskite superlattices

Competing interactions in ferromagnetic/antiferromagnetic perovskite superlattices

Emergent phenomena at oxide interfaces

Effects of strain on orbital ordering and magnetism at perovskite oxide interfaces:LaMnO3/SrMnO3

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