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Properties of manganite/ruthenate superlattices with ultrathin layers
Author(s) -
Ziese Michael,
Vrejoiu Ionela
Publication year - 2013
Publication title -
physica status solidi (rrl) – rapid research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.786
H-Index - 68
eISSN - 1862-6270
pISSN - 1862-6254
DOI - 10.1002/pssr.201307007
Subject(s) - manganite , superlattice , condensed matter physics , materials science , curie temperature , ferromagnetism , magnetization , antiferromagnetism , physics , magnetic field , quantum mechanics
The properties of manganite/ruthenate superlattices are reviewed with a specific focus on the manganite/ruthenate interface. La 0.7 Sr 0.3 MnO 3 /SrRuO 3 and Pr 0.7 Ca 0.3 MnO 3 /SrRuO 3 superlattices grow with a high crystalline perfection as illustrated in the figure to the right: at the interface the individual cation species can be clearly identified, interdiffusion is marginal. The superlattices show magnetization processes with an intricate interplay between magnetocrystalline anisotropy, size of the layer magnetization, spin confinement and interfacial antiferromagnetic interlayer coupling. There is further an unprecedented Curie temperature stabilization at room temperature values of the La 0.7 Sr 0.3 MnO 3 layers in the superlattices down to layer thicknesses of one unit cell. The magnetotransport properties, especially the Hall effect, indicate the existence of a quasi‐two‐dimensional hole gas at the La 0.7 Sr 0.3 MnO 3 /SrRuO 3 interface; this is further supported by an analysis of cation displacements as determined from scanning transmission electron microscopy. The manganite/ruthenate interface might be considered as a model system for the study of interfacial reconstruction and charge transfer in a highly correlated ferromagnetic system.HAADF‐STEM micrograph of two La 0.7 Sr 0.3 MnO 3 /SrRuO 3 interfaces in a superlattice with four unit cell thick La 0.7 Sr 0.3 MnO 3 and eight unit cell thick SrRuO 3 layers. The spheres indicate the cations as determined from the Z‐contrast. (© 2013 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)