Structural behaviour of BiFeO3/SrRuO3 superlattices: An X-ray diffraction and Raman spectroscopy investigation

Epitaxial BiFeO3/SrRuO3 superlattices have been grown by pulsed laser deposition on a (001) oriented LaAlO3 substrate and probed X-ray diffraction Raman spectroscopy. To investigate the structural competition between rhombohedral BiFeO3 orthorhombic SrRuO3 total thickness of all SLs was kept constant bilayer (period) ? varied. The interlayer strain effects are therefore tuned from large (short period) to quasi-relaxed structure (large ?). A complementary investigation using phonon dynamics hints change tetragonal in with increase effect.