Lattice distortions can stabilize magnetic ground states not observed in the bulk for thin films of undoped cobalt perovskites ACoO3. We have found that lattice distortions, in the form of tensile epitaxial strain, can stabilize a ferromagnetic ground state in PrCoO3 thin films below 65 K. However, in Pr0.7Y0.3CoO3, which has a smaller unit cell, similar levels of tensile strain are insufficient to induce ferromagnetism. These results indicate the importance of A-site cation choice for Co spin-state and Co-O-Co exchange interactions, offering another dimension to tune magnetic order in thin film cobalt perovskites.
Bibliographical noteFunding Information:
This work was supported by the U.S. Department of Energy, Office of Basic Energy Sciences, Division of Materials Sciences and Engineering under Award No. DESC0008505. USA (RBS) was supported by the National Science Foundation under DMR-1402685. MTG (assistance with magnetic characterization) was supported by the Vannevar Bush Faculty Fellowship program sponsored by the Basic Research Office of the Assistant Secretary of Defense for Research and Engineering and funded by the Office of Naval Research through grant N00014-15–1-0045. Work at UMN was funded by the Department of Energy through the University of Minnesota Center for Quantum Materials, under DE-FG02-06ER46275 and DE-SC-0016371. Financial support from Fundacin BBVA (MC) and Spanish MINECO MAT2015-66888- C3-3- R (MV) is gratefully acknowledged as well. We thank Andre Anders for help with Rutherford backscattering spectrometry.
© 2017 Elsevier B.V.
- Chemical pressure
- Epitaxial oxide thin films
- Epitaxial strain