Interfacial Coupling-Induced Ferromagnetic Insulator Phase in Manganite Film
- Department of Materials Science &, Engineering, National University of Singapore, 117576, Singapore
- Condensed Matter Physics &, Materials Science Division, Brookhaven National Laboratory, Upton, New York 11973, United States
- Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439, United States
- Singapore Synchrotron Light Source (SSLS), National University of Singapore, 5 Research Link, 117603 Singapore
- NUSNNI-Nanocore, National University of Singapore, 117411, Singapore; Department of Physics, National University of Singapore, 117542, Singapore; Department of Electrical &, Computer Engineering, National University of Singapore, 117576, Singapore
Interfaces with subtle difference in atomic and electronic structures in perovskite ABO3 heterostructures often yield intriguingly different properties, yet their exact roles remain elusive. Here, we report an integrated study of unusual transport, magnetic, and structural properties of Pr0.67Sr0.33MnO3 (PSMO) film on SrTiO3 (STO) substrate. The variations in out-of-plane lattice constant and BO6 octahedral rotation across the PSMO/STO interface strongly depend on the thickness of PSMO films. In the 12-nm film, a new interface-sensitive ferromagnetic polaronic insulator (FI’) phase is formed during the cubic-to-tetragonal phase transition of STO, apparently due to enhanced electron-phonon interaction and atomic disorder in the film. The transport properties of the FI’ phase in the 30-nm film are masked because of the reduced interfacial effect and smaller interface-to-volume ratio. This work demonstrates how thickness-dependent interfacial coupling leads to formation of the theoretically predicted novel ferromagnetic-polaronic insulator in systems, as illustrated in a new phase diagram, that are otherwise ferromagnetic metals (FM) in bulk form.
- Research Organization:
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- DOE Contract Number:
- AC02-06CH11357
- OSTI ID:
- 1429904
- Journal Information:
- Nano Letters, Vol. 16, Issue 7; ISSN 1530-6984
- Publisher:
- American Chemical Society
- Country of Publication:
- United States
- Language:
- English
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