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

Interfaces with subtle differences in atomic and electronic structures in perovskite ABO 3 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 Pr 0.67Sr 0.33MnO 3 film on SrTiO 3 substrate. The variations in the out-of-plane lattice constant and BO 6 octahedral rotation across the Pr 0.67Sr 0.33MnO 3/SrTiO 3 interface strongly depend on the thickness of the Pr 0.67Sr 0.33MnO 3 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 SrTiO 3, 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.
Authors:
 [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
Publication Date:
Report Number(s):
BNL-113256-2016-JA
Journal ID: ISSN 1530-6984; R&D Project: MA015MACA; KC0201010
Grant/Contract Number:
SC0012704
Type:
Accepted Manuscript
Journal Name:
Nano Letters
Additional Journal Information:
Journal Volume: 16; Journal Issue: 7; Journal ID: ISSN 1530-6984
Publisher:
American Chemical Society
Research Org:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ferromagnetic insulator phase; Interfacial coupling; perovskite; STEM; thickness dependence
OSTI Identifier:
1336225