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TT: Fachverband Tiefe Temperaturen

TT 8: Low-Dimensional Systems: Oxide Hetero-Interfaces

TT 8.11: Vortrag

Montag, 16. März 2015, 12:15–12:30, H 3010

Magnetism and Charge Transfer in PrNiO₃-La_0.7Ca_0.3MnO₃ Heterostructures — •Martin Bluschke^1,2, Alex Frano^1,2, Enrico Schierle², Matthias Hepting¹, Matteo Minola¹, Georg Christiani¹, Gennady Logvenov¹, Eugen Weschke², Eva Benckiser¹, and Bernhard Keimer¹ — ¹Max-Planck-Institute for Solid State Research, Stuttgart, Germany — ²Helmholz-Zentrum Berlin, Germany

Heterostructures of the bulk antiferromagnet PrNiO₃ (PNO) and the bulk ferromagnetic metal La_0.7Ca_0.3MnO₃ (LCMO) are grown by pulsed laser deposition on LaSrAlO₄ substrates for a systematic series of superlattice geometries. A characterization of the structural, magnetization, and transport properties is combined with the results of soft x-ray absorption and resonant scattering measurements to understand how the bulk properties of the individual components are modified via epitaxial strain and heterostructuring. In particular the PNO-LCMO interface is studied. A net transfer of electrons from Mn to Ni sites is observed near the interface. In addition the saturation magnetization and Curie temperature of the ferromagnetic response are found to be reduced compared to bulk LCMO. The antiferromagnetic order characteristic of bulk PNO is observed in superlattices containing 8 unit cells of PNO per bilayer, but suppressed below the detection limit for thinner 4 unit cell layers. Finally a transition between metallic and insulating behaviour in PNO is observed as the layer thickness is reduced from 12 to 4 unit cells, whereas the LCMO layers studied (4-18 unit cells) were insulating in all cases.