Superconducting transition of 
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/
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 induced by adsorption of semiconducting organic molecules

Guan, Jun; Liu, Jian; Liu, Bing; Huang, Xiaochun; Zhu, Qing; Zhu, Xuetao; Sun, Jianing; Meng, Sheng; Guo, Jiandong

doi:10.1103/physrevb.95.205405

Cited by 12 publications

(4 citation statements)

References 45 publications

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“…The corresponding 𝐸 F is reduced from 56 meV on the pristine surface (at point #1) to 37 meV adjacent to the molecule (at point #5), resulting in the suppression of superconductivity at the experiment temperature (4.9 K). [41] In Fig. 3(c), at point #1 with a distance about 11 unit cells away from the TCNQ molecules, the STS shows a U-shaped superconducting gap with two obvious coherence peaks, which exhibits the same characteristics as on the pristine superconducting surface.…”

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confidence: 86%

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Superconductivity of the FeSe/SrTiO₃ Interface in View of BCS–BEC Crossover^*

Zhang

Miao

Guan

et al. 2019

Chinese Phys. Lett.

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In paired Fermi systems, strong many-body effects exhibit in the crossover regime between the Bardeen-Cooper-Schrieffer (BCS) and the Bose-Einstein condensation (BEC) limits. The concept of the BCS-BEC crossover, which is studied intensively in the research field of cold atoms, has been extended to condensed matters. Here, by analyzing the typical superconductors within the BCS-BEC phase diagram, we find that FeSe-based superconductors are prone to shift their positions in the BCS-BEC crossover regime by charge doping or substrate substitution, since their Fermi energies and the superconducting gap sizes are comparable. Especially at the interface of a single-layer FeSe on SrTiO 3 substrate, the superconductivity is relocated closer to the crossover unitary than other doped FeSe-based materials, indicating that the pairing interaction is effectively modulated. We further show that hole-doping can drive the interfacial system into the phase with possible prepaired electrons, demonstrating its flexible tunability within the BCS-BEC crossover regime.Based on the assumption of Fermi systems with attractive interaction, Bardeen-Cooper-Schrieffer (BCS) theory [1,2] has been well applied not only to electronic systems, but also applicable to other Fermi systems, such as the superfluid state of paired Fermionic atoms [3]. Accordingly the BCS picture can be linked to the concept of Bose-Einstein condensation (BEC), as demonstrated in experiments by directly tuning the attractive interaction or scattering length of ultra-cold atoms [4][5][6][7]. In this context, the

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confidence: 86%

“…Figures 3(a) and 3(b) show the STM images of TCNQ molecules on the surface of 1uc-FeSe/STO. With the hole doping by TCNQ molecules, the electron density loss in FeSe is 0.05𝑒 − per unit cell [41] at the position near point #5 in Fig. 3(a).…”

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confidence: 99%

Superconductivity of the FeSe/SrTiO₃ Interface in View of BCS–BEC Crossover^*

Zhang

Miao

Guan

et al. 2019

Chinese Phys. Lett.

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“…Our calculations indicate that surface doping can effectively tune the magnetic properties of the top-layer FeAs on BaFe 2 As 2 (001) and may probably induce a superconducting FeAs surface layer on its parent compound BaFe 2 As 2 . Experimentally, there are several evidences for surface doping effect on the superconduc-tivity of FeSe on SrTiO 3 [39][40][41][42][43][44] and FeSe on graphitized SiC(0001) 45 .…”

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Tuning the magnetism of the top-layer FeAs on BaFe2As2 (001): First-principles study

Zhang

Liu

2018

Phys. Rev. B

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The magnetic properties of BaFe2As2(001) surface have been studied by using first-principles electronic structure calculations. We find that for As-terminated surface the magnetic ground state of the top-layer FeAs is in the staggered dimer antiferromagnetic (AFM) order, while for Ba-terminated surface the collinear (single stripe) AFM order is the most stable. When a certain coverage of Ba or K atoms are deposited onto the As-terminated surface, the calculated energy differences among different AFM orders for the top-layer FeAs on BaFe2As2(001) can be much reduced, indicating enhanced spin fluctuations. To identify the novel staggered dimer AFM order for the As termination, we have simulated the scanning tunneling microscopy (STM) image for this state, which shows a different √ 2 × √ 2 pattern from the case of half Ba coverage. Our results suggest: i) the magnetic properties of the top-layer FeAs on BaFe2As2(001) can be tuned effectively by surface doping; ii) both the surface termination and the AFM order in the top-layer FeAs can affect the STM image of BaFe2As2(001).

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“…3(j), a dip feature is observed at the Fermi level. We further normalized the spectrum by dividing the spectrum with a cubic fitting of the background [12,29], and extracted a CDW gap of 12 meV [bottom panel of Fig. 3(j)].…”

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Real-space investigation of the charge density wave in VTe2 monolayer with broken rotational and mirror symmetries

Miao

Xue

et al. 2020

Phys. Rev. B

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Superconducting transition of FeSe / SrTiO3 induced by adsorption of semiconducting organic molecules

Abstract: We prepared superconducting and non-superconducting FeSe films on

Cited by 12 publications

References 45 publications

Superconductivity of the FeSe/SrTiO₃ Interface in View of BCS–BEC Crossover^*

Superconductivity of the FeSe/SrTiO₃ Interface in View of BCS–BEC Crossover^*

Tuning the magnetism of the top-layer FeAs on BaFe2As2 (001): First-principles study

Real-space investigation of the charge density wave in VTe2 monolayer with broken rotational and mirror symmetries

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Superconducting transition of FeSe / SrTiO3 induced by adsorption of semiconducting organic molecules

Abstract: We prepared superconducting and non-superconducting FeSe films on

Cited by 12 publications

References 45 publications

Superconductivity of the FeSe/SrTiO3 Interface in View of BCS–BEC Crossover*

Superconductivity of the FeSe/SrTiO3 Interface in View of BCS–BEC Crossover*

Tuning the magnetism of the top-layer FeAs on BaFe2As2 (001): First-principles study

Real-space investigation of the charge density wave in VTe2 monolayer with broken rotational and mirror symmetries

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Superconductivity of the FeSe/SrTiO₃ Interface in View of BCS–BEC Crossover^*

Superconductivity of the FeSe/SrTiO₃ Interface in View of BCS–BEC Crossover^*