Surface electronic structure and isotropic superconducting gap in (Li0.8Fe0.2)OHFeSe
X. H. Niu, R. Peng, H. C. Xu, Y. J. Yan, J. Jiang, D. F. Xu, T. L. Yu, Q. Song, Z. C. Huang, Y. X. Wang, B. P. Xie, X. F. Lu, N. Z. Wang, X. H. Chen, Z. Sun, D. L. Feng
DOI 10.1103/PhysRevB.92.060504 · Physical Review B
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Abstract
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 (Tc)∼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 Tc, with an isotropic distribution around the electron Fermi surface. Compared with AxFe2−ySe2(A=K,Rb,Cs,Tl/K), the higher Tc 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.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| (Li0.8Fe0.2)OHFeSe Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 40 | Pressure not reported | onset |
| (Li0.8Fe0.2)OHFeSe Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 40 | Pressure not reported | onset |
| Rb0.76Fe1.87Se2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 30 | Pressure not reported | unknown |
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