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Title: Evidence for Interfacial Octahedral Coupling as a Route to Enhance Magnetoresistance in Perovskite Oxide Superlattices

Journal Article · · Advanced Materials Interfaces
 [1];  [2]; ORCiD logo [3];  [2]; ORCiD logo [4]
  1. Drexel Univ., Philadelphia, PA (United States); Tsinghua Univ., Beijing (China); Shandong Univ., Jinan (China)
  2. Vanderbilt Univ., Nashville, TN (United States)
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  4. Drexel Univ., Philadelphia, PA (United States)

Abstract Engineering octahedral rotations in oxide heterostructures is a promising route for controlling magnetic properties in perovskites, with recent work focusing on magnetic‐ordering temperatures and magnetic anisotropies. Here the effects of interfacial octahedral coupling on magnetoresistance are demonstrated in a series of (La 0.7 Sr 0.3 MnO 3 ) n /(LaFeO 3 ) 10 superlattices grown on (001)‐ and (111)‐oriented SrTiO 3 substrates. The different crystallographic orientations allow for the interfacial octahedral connectivity to be tuned, with weaker interfacial coupling present at the (001)‐oriented than the (111)‐oriented structures as revealed by density functional theory calculations. In n = 14 superlattices, the effect of orientation on the physical properties is minimal with both (001)‐ and (111)‐oriented samples exhibiting similar magnetoresistance. As the fraction of interfacial volume within the LSMO layers is increased by decreasing n , the magnetoresistive behavior of the samples diverges with significantly larger magnetoresistance magnitudes present in the (111)‐oriented superlattices. The results are consistent with octahedral coupling playing a greater role in the functional properties at (111)‐heterointerfaces and demonstrate a structure‐driven approach to tuning interfacial magnetoresistance in complex‐oxide heterostructures.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division; USDOE
Grant/Contract Number:
AC05-00OR22725; AC02-05CH11231; FG02-09ER46554; DE‐FG02‐09ER46554; DE‐AC02‐05CH11231
OSTI ID:
1823371
Alternate ID(s):
OSTI ID: 1604114
Journal Information:
Advanced Materials Interfaces, Vol. 7, Issue 9; ISSN 2196-7350
Publisher:
Wiley-VCHCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 9 works
Citation information provided by
Web of Science

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