<bold><em> In-situ</em></bold> spectroscopic studies and interfacial engineering on FeSe/oxide heterostructures: Insights on the interfacial superconductivity<xref ref-type="fn" rid="cpb151075fn1">*</xref>

In-situ spectroscopic studies and interfacial engineering on FeSe/oxide heterostructures: Insights on the interfacial superconductivity*

Peng Rui^a),^b), Xu Hai-Chao^a),^b), Feng Dong-Lai^a),^b)

(a) The superconducting gap size as a function of temperature and the corresponding BCS fitting for single-layer FeSe/STO and FeSe^SX, respectively. (b) The same as panel (a) but for FeSe^B and FeSe^BR, respectively. (c) The maximal low-temperature gap versus superconducting gap closing temperature, for various FeSe/oxide films and bulk K_xFe_{2− y}Se₂. Panel (a) is reprinted with permission from Ref. [ 16 ], copyright 2014 by the American Physical Society. Panels (b)–(c) are reprinted with permission from Ref. [ 15 ], copyright 2014 by Nature Communications.