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Title: Interfacial Coupling-Induced Ferromagnetic Insulator Phase in Manganite Film

Journal Article · · Nano Letters
 [1];  [2];  [2];  [3];  [4];  [5];  [2];  [2];  [1]
  1. National Univ. of Singapore (Singapore). Dept. of Materials Science & Engineering
  2. Brookhaven National Lab. (BNL), Upton, NY (United States). Condensed Matter Physics & Materials Science Division
  3. Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
  4. National Univ. of Singapore (Singapore). Singapore Synchrotron Light Source (SSLS)
  5. National Univ. of Singapore (Singapore). NUSNNI-Nanocore; National Univ. of Singapore (Singapore). Dept. of Physics; National Univ. of Singapore (Singapore). Dept. of Electrical & Computer Engineering

Interfaces with subtle differences 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 film on SrTiO3 substrate. The variations in the out-of-plane lattice constant and BO6 octahedral rotation across the Pr0.67Sr0.33MnO3/SrTiO3 interface strongly depend on the thickness of the Pr0.67Sr0.33MnO3 film. In the 12-nm film, a new interface-sensitive ferromagnetic polaronic insulator (FI') phase is formed during the cubic-to-tetragonal phase transition of SrTiO3, apparently due to the 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 coupling and smaller interface-to-volume ratio. In conclusion, this work demonstrates how thickness-dependent interfacial coupling leads to the formation of a theoretically predicted ferromagnetic–polaronic insulator, as illustrated in a new phase diagram, that is otherwise ferromagnetic metal (FM) in bulk form.

Research Organization:
Brookhaven National Lab. (BNL), Upton, NY (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0012704
OSTI ID:
1336225
Report Number(s):
BNL-113256-2016-JA; R&D Project: MA015MACA; KC0201010
Journal Information:
Nano Letters, Vol. 16, Issue 7; ISSN 1530-6984
Publisher:
American Chemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 22 works
Citation information provided by
Web of Science

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Cited By (4)

Thickness-dependent polarization-induced intrinsic magnetoelectric effects in L a 0.67 S r 0.33 Mn O 3 / PbZ r 0.52 T i 0.48 O 3 heterostructures journal September 2019
Atomic-scale determination of spontaneous magnetic reversal in oxide heterostructures journal May 2019
Control of magnetic anisotropy by orbital hybridization with charge transfer in (La0.67Sr0.33MnO3)n/(SrTiO3)n superlattice journal September 2018
The Atomic Circus: Small Electron Beams Spotlight Advanced Materials Down to the Atomic Scale journal October 2018