Enhancement of electron correlations in ion-gated FeSe film by 
<i>in situ</i>
 Seebeck and Hall measurements

Zhang, Xu; Feng, Zhaochi; Wei, Xinjian; Lin, Zefeng; Jiang, Xingyu; Hu, Wei; Wei, Zhongxu; Qin, Mingyang; Xu, Juan; Xiong, Rui; Shi, Jing; Yuan, Jie; Zhu, Bo; Chen, Qihong; Jin, Kui

doi:10.1103/physrevb.103.214505

Cited by 7 publications

(3 citation statements)

References 46 publications

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“…4 A ). The very large increase in

observed in the thinnest

-nm flake resembles the behavior of thin films of FeSe with lower RRR values ( 59 ). Recently, it was shown theoretically that the impurity scattering in FeSe can give rise to anisotropic scattering and anisotropy in resistivity ( 66 ).…”

Section: Discussionmentioning

confidence: 59%

“…Assuming that the effective masses of heavy electrons are the same for the bulk and thin flakes, then the changes in mobilities between electron and hole carriers could reflect an anisotropy in scattering (classical scattering time being

ps for electrons and 1.8 ps for holes). Interestingly, the effective mass extracted from ARPES studies is much smaller,

, for a single momentum direction ( 7 , 13 ), and it can be enhanced in thin films and flakes of FeSe up to

, both using K-dosing of FeSe ( 58 ) and ionic liquid gating ( 59 ). Orbitally dependent band shifts and renormalizations were detected previously in FeSe, with the dominant d xy hole band being the most renormalized by a factor of 8, as compared with a factor 2.5 to 3.5 for the d xz and d yz orbitals ( 2 , 7 ).…”

Section: Discussionmentioning

confidence: 99%

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Unconventional localization of electrons inside of a nematic electronic phase

Farrar

Zajicek

Morfoot

et al. 2022

Proc. Natl. Acad. Sci. U.S.A.

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The magnetotransport behavior inside the nematic phase of bulk FeSe reveals unusual multiband effects that cannot be reconciled with a simple two-band approximation proposed by surface-sensitive spectroscopic probes. In order to understand the role played by the multiband electronic structure and the degree of two-dimensionality, we have investigated the electronic properties of exfoliated flakes of FeSe by reducing their thickness. Based on magnetotransport and Hall resistivity measurements, we assess the mobility spectrum that suggests an unusual asymmetry between the mobilities of the electrons and holes, with the electron carriers becoming localized inside the nematic phase. Quantum oscillations in magnetic fields up to 38 T indicate the presence of a hole-like quasiparticle with a lighter effective mass and a quantum scattering time three times shorter, as compared with bulk FeSe. The observed localization of negative charge carriers by reducing dimensionality can be driven by orbitally dependent correlation effects, enhanced interband spin fluctuations, or a Lifshitz-like transition, which affect mainly the electron bands. The electronic localization leads to a fragile two-dimensional superconductivity in thin flakes of FeSe, in contrast to the two-dimensional high- T c induced with electron doping via dosing or using a suitable interface.

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“…4 A ). The very large increase in

observed in the thinnest

Section: Discussionmentioning

confidence: 59%

ps for electrons and 1.8 ps for holes). Interestingly, the effective mass extracted from ARPES studies is much smaller,

, for a single momentum direction ( 7 , 13 ), and it can be enhanced in thin films and flakes of FeSe up to

Section: Discussionmentioning

confidence: 99%

Unconventional localization of electrons inside of a nematic electronic phase

Farrar

Zajicek

Morfoot

et al. 2022

Proc. Natl. Acad. Sci. U.S.A.

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show abstract

“…It is worth pointing out that the temperature of ∼52 K at which the resistance deviates from the linear extrapolation of the normal state agrees well with a \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{upgreek} \usepackage{mathrsfs} \setlength{\oddsidemargin}{-69pt} \begin{document} $T_{\mathrm{c}}^{{\mathrm{on}}}$\end{document} of ∼50 K in FeSe–EDLT, supporting that the disorder still dominates the wide transition in the monolayer FeSe on the δ-doped STO(001). Moreover, the EDLT doping could enhance electron correlation compared with the monolayer FeSe (3.4 vs. 2.7 m e , where m e is the free electron mass) [ 56 , 57 ]. Between T p of ∼65–83 K and \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{upgreek} \usepackage{mathrsfs} \setlength{\oddsidemargin}{-69pt} \begin{document} $T_{\mathrm{c}}^{{\mathrm{on}}}$\end{document} of ∼50 K, whether the pseudogap state or BKT physics dominates remains unsolved.…”

Section: Discussionmentioning

confidence: 99%

Significantly enhanced superconductivity in monolayer FeSe films on SrTiO3(001) via metallic δ-doping

Jiao

Dong

Shi

et al. 2023

National Science Review

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Superconductivity transition temperature (Tc) marks the inception of a macroscopic quantum phase-coherent paired state in fermionic systems. For two-dimension superconductivity, the paired electrons condense into a coherent superfluid state at Tc, which is usually lower than the pairing temperature, between which intrinsic physics including Berezinskii-Kosterlitz-Thouless transition and pseudogap state are hotly debated. In the case of monolayer FeSe superconducting films on SrTiO3(001), although the pairing temperature (Tp) is revealed to be 65–83 K by spectroscopy characterization, the measured zero-resistance temperature (${T}_{c}^0$) is limited to 20 K. Here, we report significantly enhanced superconductivity in monolayer FeSe films by δ-doping of Eu or Al on SrTiO3(001) surface, in which ${T}_{c}^0$ is enhanced by 12 K with narrowed transition width ΔTc ∼ 8 K, compared with non-doped samples. Using scanning tunneling microscopy/spectroscopy measurements, we demonstrate lowered work function of the δ-doped-SrTiO3(001) surface and enlarged superconducting gaps in the monolayer FeSe with improved morphology/electronic homogeneity. Our work provides a practical route to enhance 2D superconductivity by interface engineering.

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Study of composition-modulated interband transitions characteristic and charge dynamics response of high-throughput FeSe1-Te combinatorial film

Wang,

Wei,

et al. 2024

Journal of Alloys and Compounds

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Enhancement of electron correlations in ion-gated FeSe film by in situ Seebeck and Hall measurements

Cited by 7 publications

References 46 publications

Unconventional localization of electrons inside of a nematic electronic phase

Unconventional localization of electrons inside of a nematic electronic phase

Significantly enhanced superconductivity in monolayer FeSe films on SrTiO3(001) via metallic δ-doping

Study of composition-modulated interband transitions characteristic and charge dynamics response of high-throughput FeSe1-Te combinatorial film

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