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Title: Enhanced magnetism in lightly doped manganite heterostructures: strain or stoichiometry?

Journal Article · · Nanoscale
DOI:https://doi.org/10.1039/C8NR09693G· OSTI ID:1544709
 [1];  [2];  [3];  [4]; ORCiD logo [5];  [3];  [6]; ORCiD logo [7];  [8]; ORCiD logo [4];  [9]; ORCiD logo [3]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States). Center for Integrated Nanotechnologies (CINT); New Mexico State Univ., Las Cruces, NM (United States)
  2. National Univ. of Singapore (Singapore); Xi'an Jiaotong Univ. (China)
  3. Los Alamos National Lab. (LANL), Los Alamos, NM (United States). Center for Integrated Nanotechnologies (CINT)
  4. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  5. Los Alamos National Lab. (LANL), Los Alamos, NM (United States). Center for Integrated Nanotechnologies (CINT); Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  6. West Virginia Univ., Morgantown, WV (United States)
  7. New Mexico State Univ., Las Cruces, NM (United States)
  8. Xi'an Jiaotong Univ. (China)
  9. National Univ. of Singapore (Singapore)

Lattice mismatch induced epitaxial strain has been widely used to tune functional properties in complex oxide heterostructures. Apart from the epitaxial strain, a large lattice mismatch also produces other effects including modulations in microstructure and stoichiometry. However, it is challenging to distinguish the impact of these effects from the strain contribution to thin film properties. Here, we use La0.9Sr0.1MnO3 (LSMO), a lightly doped manganite close to the vertical phase boundary, as a model system to demonstrate that both epitaxial strain and cation stoichiometry induced by strain relaxation contribute to functionality tuning. The thinner LSMO films are metallic with a greatly enhanced TC which is 97 K higher than the bulk value. Such anomalies in TC and transport cannot be fully explained by the epitaxial strain alone. Detailed microstructure analysis indicates La deficiency in thinner films and twin domains formation in thicker films. Our results have revealed that both epitaxial strain and strain relaxation induced stoichiometry/microstructure modulations contribute to the modified functional properties in lightly doped manganite perovskite thin films.

Research Organization:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
89233218CNA000001
OSTI ID:
1544709
Alternate ID(s):
OSTI ID: 1504513
Report Number(s):
LA-UR-19-25634; NANOHL
Journal Information:
Nanoscale, Vol. 11, Issue 15; ISSN 2040-3364
Publisher:
Royal Society of ChemistryCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 13 works
Citation information provided by
Web of Science

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Cited By (2)

Controllable conduction and hidden phase transitions revealed via vertical strain journal June 2019
Semicoherent oxide heterointerfaces: Structure, properties, and implications journal October 2019

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