Journal
NATURE MATERIALS
Volume 12, Issue 7, Pages 634-640Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/NMAT3654
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Funding
- National Science Foundation of China
- National Basic Research Program of China (973 Program) [2012CB921400, 2011CB921802, 2011CBA00112, 2011CB309703, 91026016]
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The record superconducting transition temperature (T-c) for the iron-based high-temperature superconductors (Fe-HTS) has long been 56 K. Recently, in single-layer FeSe films grown on SrTiO3 substrates, indications of a new record of 65 K have been reported. Using in situ photoemission measurements, we substantiate the presence of spin density waves (SDWs) in FeSe films-a key ingredient of Fe-HTS that was missed in FeSe before-and we find that this weakens with increased thickness or reduced strain. We demonstrate that the superconductivity occurs when the electrons transferred from the oxygen-vacant substrate suppress the otherwise pronounced SDWs in single-layer FeSe. Beyond providing a comprehensive understanding of FeSe films and directions to further enhance its T-c, we map out the phase diagram of FeSe as a function of lattice constant, which contains all the essential physics of Fe-HTS. With the simplest structure, cleanest composition and single tuning parameter, monolayer FeSe is an ideal system for testing theories of Fe-HTS.
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