Superconductivity above 28 K in single unit cell FeSe films interfaced with GaO2− layer on NdGaO3(1 1 0)

Yang, Heng; Zhou, Guanyu; Zhu, Yezi; Gong, Guanghua; Zhang, Qinghua; Liao, Menghan; Li, Zheng; Ding, Cui; Meng, Fanqi; Rafique, Mohsin; Wang, Heng; Gu, Lin; Zhang, Ding; Wang, Lili; Xue, Qi‐Kun

doi:10.1016/j.scib.2019.03.017

Cited by 11 publications

(4 citation statements)

References 42 publications

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“…Undoped bulk FeSe is superconducting below 8 K 11 , above which only nematicity but no long-range magnetic order is present at ambient pressure [12][13][14] , although strong spin fluctuations have been found by inelastic neutron scattering 15 . Monolayer FeSe shows strongly enhanced superconductivity with T c up to 70 K when epitaxially grown on SrTiO 3 (STO) [16][17][18][19][20] and other oxides [21][22][23][24][25][26][27] . Several mechanisms have been related to this emerging superconducting phase 28 , including spin fluctuations [29][30][31] , electron doping [32][33][34][35] , and electron-phonon coupling [36][37][38][39][40][41] .…”

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confidence: 99%

High-temperature superconductivity and its robustness against magnetic polarization in monolayer FeSe on EuTiO3

et al. 2021

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Spin degree of freedom generally plays an important role in unconventional superconductivity. In many of the iron-based compounds, superconductivity is found in close proximity to long-range antiferromagnetic order, whereas monolayer FeSe grown on SrTiO3, with enhanced superconductivity, exhibits no magnetic or nematic ordering. Here we grow monolayer and multilayer FeSe on antiferromagnetic EuTiO3(001) layers, in an effort to introduce a spin polarization in proximity to the superconductivity of FeSe. By X-ray magnetic dichroism, we observe an antiferromagnet–ferromagnet switching on Eu and Ti sites in EuTiO3 driven by the applied magnetic field, with no concomitant spin polarization on the Fe site of FeSe. Transport measurements show enhanced superconductivity of monolayer FeSe on EuTiO3 with a transition temperature of ~30 K. The band structure revealed by photoemission spectroscopy is analogous to that of FeSe/SrTiO3. Our work creates a platform for the interplay of spin and unconventional superconductivity in the two-dimensional limit.

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confidence: 99%

High-temperature superconductivity and its robustness against magnetic polarization in monolayer FeSe on EuTiO3

et al. 2021

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“…It is worthy pointing out the universality of T c enhancement when 1UC FeSe grown on various oxide substrates with high energy bonds like Ti-O bonds or other. Such substrates include BTO(001) [74], STO (110) [115,116], anatase TiO 2 (001) [117], rutile TiO 2 (001) [118] and GaO 2−δ [119]. High-energy F-K phonons present also in a variety of oxide substrates with similar energies as shown in Figure 7(f ).…”

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confidence: 83%

Interface enhanced superconductivity in FeSe/SrTiO 3 and the hidden nature

Han¹,

Song²,

Ma³

et al. 2022

Comptes Rendus. Physique

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The superconductivity confined in a two-dimensional interface exhibits many exotic phenomena that have certain counterparts in layered cuprates and iron-based superconductors, and thus provides rare opportunities to reveal the mystery of high temperature superconductivity therein. By constructing and tailoring hybrid heterostructures such as FeSe/SrTiO 3 (FeSe/STO), interface-enhanced superconductivity arouses, and the substrate has been demonstrated to provide the phonons and enhance the strong electronphonon coupling (EPC) within monolayer FeSe. More research and reporting systems uncover that the bandbending induced charge transfer at the interface could become a unified microscopic picture to design the new interface superconductors. With re-examination of the experimental research in LaAlO 3 /STO (LAO/STO) and unconventional superconductors, the common characteristics such as band bending and rigid band shift are perceived in the FeSe/STO, LAO/STO and cuprate superconductors. This review may provide important information to inspect the mechanism of high-T c superconductivity from a different view.

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“…The first layer of FeSe and the intermediate layer form a sharp interface, indicating that FeSe can be grown well on the VO x -terminated SVO. Our results provide a new interfacial system of 1 UC FeSe grown on non-TiO x -terminated oxides after FeSe/MgO, FeSe/NdGaO 3 , and FeSe/LaFeO 3 (FeSe/LFO) …”

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confidence: 89%

Inferior Interfacial Superconductivity in 1 UC FeSe/SrVO₃/SrTiO₃ with Screened Interfacial Electron–Phonon Coupling

Guo,

Chen,

et al. 2024

Nano Lett.

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Single-unit cell (1 UC) FeSe interfaced with TiO x or FeO x exhibits significantly enhanced superconductivity compared to that of bulk FeSe, with interfacial electron−phonon coupling (EPC) playing a crucial role. However, the reduced dimensionality in 1 UC FeSe, which may drive superconducting fluctuations, complicates our understanding of the enhancement mechanisms. We construct a new superconducting interface, 1 UC FeSe/SrVO 3 /SrTiO 3 . Here, the itinerant electrons of highly metallic SrVO 3 films can screen all highenergy Fuchs−Kliewer phonons, including those of SrTiO 3 , making it the first FeSe/oxide system with screened interfacial EPC while maintaining the 1 UC FeSe thickness. Despite comparable doping levels, the heavily electron-doped 1 UC FeSe/SrVO 3 exhibits a pairing temperature (T g ∼ 48 K) lower than those of FeSe/SrTiO 3 and FeSe/LaFeO 3 . Our findings disentangle the contributions of interfacial EPC from dimensionality in terms of enhancing T g in FeSe/oxide interfaces, underscoring the critical importance of interfacial EPC. This FeSe/VO x interface also provides a platform for studying interfacial superconductivity.

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Superconductivity above 28 K in single unit cell FeSe films interfaced with GaO2− layer on NdGaO3(1 1 0)

Cited by 11 publications

References 42 publications

High-temperature superconductivity and its robustness against magnetic polarization in monolayer FeSe on EuTiO3

High-temperature superconductivity and its robustness against magnetic polarization in monolayer FeSe on EuTiO3

Interface enhanced superconductivity in FeSe/SrTiO 3 and the hidden nature

Inferior Interfacial Superconductivity in 1 UC FeSe/SrVO₃/SrTiO₃ with Screened Interfacial Electron–Phonon Coupling

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Superconductivity above 28 K in single unit cell FeSe films interfaced with GaO2− layer on NdGaO3(1 1 0)

Cited by 11 publications

References 42 publications

High-temperature superconductivity and its robustness against magnetic polarization in monolayer FeSe on EuTiO3

High-temperature superconductivity and its robustness against magnetic polarization in monolayer FeSe on EuTiO3

Interface enhanced superconductivity in FeSe/SrTiO 3 and the hidden nature

Inferior Interfacial Superconductivity in 1 UC FeSe/SrVO3/SrTiO3 with Screened Interfacial Electron–Phonon Coupling

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Product

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Superconductivity above 28 K in single unit cell FeSe films interfaced with GaO2− layer on NdGaO3(1 1 0)

Inferior Interfacial Superconductivity in 1 UC FeSe/SrVO₃/SrTiO₃ with Screened Interfacial Electron–Phonon Coupling