期刊
NATURE COMMUNICATIONS
卷 7, 期 -, 页码 -出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/ncomms11260
关键词
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资金
- National Basic Research Program of China (973 Program) [2013CB932901, 2014CB921104]
- National Natural Science Foundation of China [91121002, 11274071, 11504053, 11274060]
- Shanghai Municipal Natural Science Foundation [14JC1400500]
For strongly correlated oxides, it has been a long-standing issue regarding the role of the chemical ordering of the dopants on the physical properties. Here, using unit cell by unit cell superlattice growth technique, we determine the role of chemical ordering of the Pr dopant in a colossal magnetoresistant (La1-yPry)(1-x)CaxMnO3 (LPCMO) system, which has been well known for its large length-scale electronic phase separation phenomena. Our experimental results show that the chemical ordering of Pr leads to marked reduction of the length scale of electronic phase separations. Moreover, compared with the conventional Pr-disordered LPCMO system, the Pr-ordered LPCMO system has a metal-insulator transition that is similar to 100 K higher because the ferromagnetic metallic phase is more dominant at all temperatures below the Curie temperature.
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