期刊
PHYSICAL REVIEW B
卷 92, 期 6, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.92.060504
关键词
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资金
- National Science Foundation of China
- National Basic Research Program of China (973 Program) [2012CB921402, 2012CB927401, 2011CB921802, 2011CBA00112, 2011CBA00106]
Using angle-resolved photoemission spectroscopy (ARPES), we revealed the surface electronic structure and superconducting gap of (Li0.8Fe0.2)OHFeSe, an intercalated FeSe-derived superconductor without antiferromagnetic phase or Fe-vacancy order in the FeSe layers, and with a superconducting transition temperature (T-c) similar to 40 K. We found that (Li0.8Fe0.2)OH layers dope electrons into FeSe layers. The electronic structure of surface FeSe layers in (Li0.8Fe0.2)OHFeSe resembles that of RbxFe2-ySe2 except that it only contains half of the carriers due to the polar surface, suggesting similar quasiparticle dynamics between bulk (Li0.8Fe0.2)OHFeSe and RbxFe2-ySe2. Superconducting gap is clearly observed below T-c, with an isotropic distribution around the electron Fermi surface. Compared with A(x)Fe(2-y)Se(2) (A = K, Rb, Cs, Tl/K), the higher T-c in (Li0.8Fe0.2)OHFeSe might be attributed to higher homogeneity of FeSe layers or to some unknown roles played by the (Li0.8Fe0.2) OH layers.
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