期刊
SCIENCE
卷 368, 期 6486, 页码 71-+出版社
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.aax9753
关键词
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资金
- U.S. Department of Energy, Office of Basic Energy Sciences (DOE-BES), Division of Materials Sciences and Engineering [DE-AC02-76SF00515]
- Gordon and Betty Moore Foundation's Emergent Phenomena in Quantum Systems Initiative [GBMF4415]
- Air Force Office of Scientific Research (AFOSR) Hybrid Materials MURI [FA9550-18-1-0480]
- DOE [DE-SC0012375]
- Army Research Office (ARO) [W911NF-15-1-0017]
- German Science Foundation (DFG) within CRC [TRR80]
- NSF [ACI-1548562, ECCS-1542152]
- CARBON Cluster at Argonne National Laboratory (DOE-BES) [DE-AC02-06CH11357]
- DFG grants [INST 20876/209-1 FUGG, INST20876/243-1 FUGG]
A defining feature of emergent phenomena in complex oxides is the competition and cooperation between ground states. In manganites, the balance between metallic and insulating phases can be tuned by the lattice; extending the range of lattice control would enhance the ability to access other phases. We stabilized uniform extreme tensile strain in nanoscale La0.7Ca0.3MnO3 membranes, exceeding 8% uniaxially and 5% biaxially. Uniaxial and biaxial strain suppresses the ferromagnetic metal at distinctly different strain values, inducing an insulator that can be extinguished by a magnetic field. Electronic structure calculations indicate that the insulator consists of charge-ordered Mn4+ and Mn3+ with staggered strain-enhanced Jahn-Teller distortions within the plane. This highly tunable strained membrane approach provides a broad opportunity to design and manipulate correlated electron states.
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