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Keywords:

  • EELS;
  • magnetic phase transitions;
  • oxide superlattices;
  • Ruddleson–Popper

Abstract

Thumbnail image of graphical abstract

A structural transition has been observed in a digital superlattice of La2/3Sr4/3MnO4, which is correlated to a magnetization enhancement upon cooling the sample. These artificial superlattices were grown layer-by-layer using ozone-assisted molecular beam epitaxy (MBE). Electron diffraction experiments show a phase transition below 150 K in nanopatches of the superlattice, which coincides with an enhanced magnetization starting below 110 K. Atomic scale electron energy loss spectroscopy (EELS) also shows changes in the Mn L2,3 and O K edges, which are related to valence, strain, and the atomic coordination within nanopatches.

Atomic resolution image and EELS showing variations of oxygen and lanthanum signature edges in a La2/3Sr4/3MnO4 supperlattice.