4.8 Article

Antiferromagnetic Order in Epitaxial FeSe Films on SrTiO3

期刊

PHYSICAL REVIEW LETTERS
卷 120, 期 9, 页码 -

出版社

AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.120.097001

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资金

  1. Ministry of Science and Technology of China [2016YFA0301003, 2016YFA0300403, 2017YFA0303202]
  2. National Natural Science Foundation of China [U1632272, 11574201, 11521404, 11674224, 11790313, 11727808, 11674159, 51471086]
  3. Changjiang Scholars Program
  4. DOE Office of Science User Facility [DE-AC02-05CH11231]

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Single monolayer FeSe film grown on a Nb-doped SrTiO3(001) substrate shows the highest superconducting transition temperature (T-C similar to 100 K) among the iron-based superconductors ( iron pnictides), while the TC value of bulk FeSe is only similar to 8 K. Although bulk FeSe does not show antiferromagnetic order, calculations suggest that the parent FeSe/SrTiO3 films are antiferromagnetic. Experimentally, because of a lack of a direct probe, the magnetic state of FeSe/SrTiO3 films remains mysterious. Here, we report direct evidence of antiferromagnetic order in the parent FeSe/SrTiO3 films by the magnetic exchange bias effect measurements. The magnetic blocking temperature is similar to 140 K for a single monolayer film. The antiferromagnetic order disappears after electron doping.

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