Absence of superconductivity in ultrathin layers of FeSe synthesized on a topological insulator

Eich, Andreas; Rollfing, Nils; Arnold, Fabian; Sanders, Charlotte E.; Ewen, Pascal R.; Bianchi, Marco; Dendzik, Maciej; Michiardi, Matteo; Mi, Jianli; Bremholm, Martin; Wegner, Daniel; Hofmann, Philip; Khajetoorians, Alexander A.

doi:10.1103/physrevb.94.125437

Cited by 25 publications

(29 citation statements)

References 32 publications

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“…3c) indicates the presence of superconducting correlations in the TI material close to the interface. The atomic sharpness of this interface suggests that the topological surface state of the TI substrate stays intact as also shown recently by photoemission experiments for the case of a FeSe–Bi 2 Se 3 heterostructure41. The FeTe–Bi 2 Te 3 interface therefore provides an ideal platform to study the interesting physics of Dirac fermions interacting with Cooper pairs.…”

Section: Discussionsupporting

confidence: 68%

Interfacial superconductivity in a bi-collinear antiferromagnetically ordered FeTe monolayer on a topological insulator

Manna¹,

Kamlapure²,

Cornils³

et al. 2017

Nat Commun

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The discovery of high-temperature superconductivity in Fe-based compounds triggered numerous investigations on the interplay between superconductivity and magnetism, and on the enhancement of transition temperatures through interface effects. It is widely believed that the emergence of optimal superconductivity is intimately linked to the suppression of long-range antiferromagnetic (AFM) order, although the exact microscopic picture remains elusive because of the lack of atomically resolved data. Here we present spin-polarized scanning tunnelling spectroscopy of ultrathin FeTe1−xSex (x=0, 0.5) films on bulk topological insulators. Surprisingly, we find an energy gap at the Fermi level, indicating superconducting correlations up to Tc∼6 K for one unit cell FeTe grown on Bi2Te3, in contrast to the non-superconducting bulk FeTe. The gap spatially coexists with bi-collinear AFM order. This finding opens perspectives for theoretical studies of competing orders in Fe-based superconductors and for experimental investigations of exotic phases in superconducting layers on topological insulators.

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Section: Discussionsupporting

confidence: 68%

Interfacial superconductivity in a bi-collinear antiferromagnetically ordered FeTe monolayer on a topological insulator

Manna¹,

Kamlapure²,

Cornils³

et al. 2017

Nat Commun

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“…This is smaller than the 1 TL of bulk FeSe (~ 5.33 Å ), indicating that most of the FeSe is embedded inside Pb. Similar growth has been reported when FeSe film is grown on soft substrates [30][31][32]. The lattice modeling of FeSe and Pb estimates the thickness of our FeSe is 3 TL (see Supplemental Material) although it cannot be precisely determined by STM.…”

supporting

confidence: 80%

Visualization of Local Magnetic Moments Emerging from Impurities in Hund’s Metal States of FeSe

et al. 2020

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Understanding the origin of the magnetism of high temperature superconductors is crucial for establishing their unconventional pairing mechanism. Recently, theory predicts that FeSe is close to a magnetic quantum critical point, and thus weak perturbations such as impurities could induce local magnetic moments. To elucidate such quantum instability, we have employed scanning tunneling microscopy and spectroscopy. In particular, we have grown FeSe film on superconducting Pb(111) using molecular beam epitaxy and investigated magnetic excitation caused by impurities in the proximity-induced superconducting gap of FeSe. Our study provides a deep insight into the origin of the magnetic ordering of FeSe by showing the way local magnetic moments develop in response to impurities near the magnetic quantum critical point.

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“…Journal of Nanomaterials the opposite trend (increased T c measured in thin films compared to those of bulk samples) has been observed in doubleatomic-layer Ga films on GaN [24], FeSe monolayer films on SrTiO 3 [27], and FeSe on TiO 2 [28]. These interesting results, together with the present work on the MBE-grown Al nanofilm, may suggest that the interface effects play a significant role in the enhanced superconductor transition temperature in a thin film over that of its bulk counterpart [29].…”

supporting

confidence: 41%

Topological Transition in a 3 nm Thick Al Film Grown by Molecular Beam Epitaxy

Kumar

Chang

et al. 2019

Journal of Nanomaterials

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We have performed detailed transport measurements on a 3 nm thick (as-grown) Al film on GaAs prepared by molecular beam epitaxy (MBE). Such an epitaxial film grown on a GaAs substrate shows the Berezinskii-Kosterlitz-Thouless (BKT) transition, a topological transition in two dimensions. Our experimental data shows that the MBE-grown Al nanofilm is an ideal system for probing interesting physical phenomena such as the BKT transition and superconductivity. The increased superconductor transition temperature (~2.4 K) compared to that of bulk Al (1.2 K), together with the ultrathin film quality, may be advantageous for future superconductor-based quantum devices and quantum information technology.

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Absence of superconductivity in ultrathin layers of FeSe synthesized on a topological insulator

Cited by 25 publications

References 32 publications

Interfacial superconductivity in a bi-collinear antiferromagnetically ordered FeTe monolayer on a topological insulator

Interfacial superconductivity in a bi-collinear antiferromagnetically ordered FeTe monolayer on a topological insulator

Visualization of Local Magnetic Moments Emerging from Impurities in Hund’s Metal States of FeSe

Topological Transition in a 3 nm Thick Al Film Grown by Molecular Beam Epitaxy

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