Regensburg 2019 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 17: Poster Session: Correlated Electrons 1

TT 17.26: Poster

Montag, 1. April 2019, 15:00–18:30, Poster D

Orbital polarization of vanadate superlattices
— •Padma Radhakrishnan — Max Planck Institute for Solid State Research, Stuttgart, Germany

Rare earth vanadates (RVO₃), R- rare-earth element such as La, Y, etc have a rich phase diagram with two different spin and orbital orders depending upon the size of the lanthanide rare-earth cation [1] Heterostructuring these materials alters their structure through epitaxial strain and could further introduce spatial confinement and interface effects [2].
Multilayers of yttrium vanadate (YVO₃) with LaAlO₃ were grown using ultra-high-vacuum pulsed laser deposition on NdGaO₃ substrate. X-ray diffraction, scanning transmission electron microscopy and X-ray absorption revealed that the samples are of good quality and of pure phase. From Resonant reflectometry, depth resolved XAS profiles were obtained for the YVO₃ stack, which showed a clear modulation of the electronic structure between the interfacial and inner layers. Further, application of sum rules suggests that both types of layers have altered t_2g orbital occupations compared to that of bulk YVO₃, which is very likely to affect the orbital ordering and spin ordering at low temperatures.
S. Miyasaka, Y. Okimoto, M. Iwama, and Y. Tokura, Phys. Rev. B, 68, 2003.
E. Benckiser et al., Nature Materials, 10, 2011