Impact of interstitial oxygen on the electronic and magnetic structure in superconductingFe1+yTeOxthin films

Direct imaging of electron transfer and its influence on superconducting pairing at FeSe/SrTiO 3 interface

“…1B ) shows that there is an interstitial layer between STO and FeSe films. Similar interfacial structures were reported ( 17 , 38 ). The room temperature EELS study on FeSe/STO system ( 17 ) identified the layer as two TiO x layers with increased oxygen vacancies.…”

Molecular beam epitaxy preparation and in situ characterization of FeTe thin films

“…We are thus operating in a Te-limited growth mode. This is to be contrasted to the earlier thin film studies where the Fe supply was limiting the growth [18,22,23]. This is caused by the low substrate temperature relative to the Te supply rate used in our study.…”

“…Pulsed laser deposition (PLD) [14][15][16][17] and molecular beam epitaxy (MBE) [18,22,23] have been applied to synthesize the films. In these earlier PLD studies, nominally stoichiometric targets or targets with some excess Te have been used.…”

Oxygen Adsorption Induced Superconductivity in Ultrathin FeTe Film on SrTiO3(001)

“…Non-superconducting FeTe with antiferromagnetic (AFM) orders was considered as the parent compound of Iron-chalcogenide superconductors [ 10 ]. Superconductivity could be induced in FeTe through Se or S substitution [ 10 ] and oxygen incorporation by low-temperature annealing or long-time exposure in an O 2 atmosphere [ 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 ]. Despite lots of efforts towards understanding oxygenated FeTe bulk crystals [ 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 ] and thin films [ 11 , 12 , 13 , 14 , 21 ], the microscopic role played by oxygen is still unknown.…”

“…Zheng et al [ 12 ] found that interstitial oxygen, rather than oxygen substitution [ 23 ], was responsible for the emergence of superconductivity. The interstitial oxygen [ 13 , 16 ] would dope holes into FeTe [ 17 ], suppress the AFM ordering and then induce superconductivity. Yamazaki et al [ 19 ] and Sun et al [ 18 ] have studied the dynamics of oxygen annealing and concluded that the superconductivity first emerged on the surface and the superconducting regions moved inside with non-superconducting materials left on the surface, such as Fe 2 O 3 , TeO x , FeTe 2 .…”