In fact, high resolution measurements of the electronic structure of FeSe by ARPES at beamline I05 at Diamond have previously made several important experimental contributions to the understanding

ARPES microscopy measurements of the domain population within the nematic phase of FeSe single crystals. We are able to demonstrate a variation of the

(b) ARPES spectra taken along the Γ−M direction on a twinned FeSe. (c),(d) ARPES spectra taken on detwinned FeSe along the Γ−M X and Γ−M Y directions, respectively. (e),(f) EDCs taken at the momentum pointed to by arrows in (b)–(d). All measurements are taken with 70 eV photons under odd polarization with respect to the cut direction. 2020-01-31 2017-04-01 This quantitatively accurate model of FeSe is then used to predict a large temperature dependence of the chemical potential within this system, which we confirm via ARPES measurements. We then modify this tight binding model to account for the C4 symmetry breaking effect of the nematic phase of FeSe, which occurs below Ts = 90 K. ARPES on FeSe /SrTiO 3 Films and Silicene Xingjiang ZHOU (周兴江) National Lab for Superconductivity Institute of Physics, Chinese Academy of Sciences, Beijing, China 5th Swiss-China Workshop 2015/05/04-05, Brugg, Switzerland . Laser ARPES Group at the Institute of Physics, CAS, Beijing superconductors FeSe xTe1 x.

Arpes fese

The application of a mechanical strain is used to promote the volume fraction of one of the orthorhombic domains in the sample, which we estimate to be 80% detwinned. While the full structure of the electron pockets consisting of two crossed ellipses may be observed in the tetragonal phase at temperatures above 90 2015-04-16 · The ARPES results on FeSe single crystals reported so far give a basically consistent picture [32, 67, 68], as exemplified in figure 4. First, at low temperature below the structural transition (~90 K), the Γ point is dominated by two hole-like bands (figure 4( f ) ), while near the M point, an electron-like band crossing the Fermi level and a hole-like band at higher binding energy are observed. toemission (ARPES) measurements on the single-layer FeSe/ SrTiO 3 films at various carrier concentrations. At a very low carrier concentration, the spectral weight near the Fermi level is suppressed, accompanied with the opening of an insulating energy gap. When the carrier concentration increases, the spectral We report results on epitaxial FeSe thin films grown by pulsed laser deposition (PLD) on CaF2 (001) substrates as obtained by exploiting the advantages of an all-in-situ ultra-high vacuum (UHV) laboratory allowing for direct high-resolution surface analysis by scanning tunnelling microscopy (STM), synchrotron radiation X-ray photoelectron spectroscopy (XPS) and angle-resolved photoemission spectroscopy (ARPES) on fresh surfaces. (a) ARPES intensity map at E F as a function of the two-dimensional wave vector measured in the nematic phase (T = 30 K) for strain-free bulk FeSe (T c ∼ 8 K). The intensity was obtained by integrating the spectral intensity within ± 10 meV with respect to E F .

ARPES on FeSe /SrTiO 3 Films and Silicene Xingjiang ZHOU (周兴江) National Lab for Superconductivity Institute of Physics, Chinese Academy of Sciences, Beijing, China 5th Swiss-China Workshop 2015/05/04-05, Brugg, Switzerland

Laser ARPES Group at the Institute of Physics, CAS, Beijing superconductors FeSe xTe1 x. Our ARPES data from the ternary iron chalcogenide FeSe0:42Te0:58 show a simple nonreconstructed Fermi surface (FS) that is well repro-duced by band structure calculations, which allows us to determine the mass enhancement for all Fermi surface sheets.

ARPES Studies of Monolayer FeSe on MBE Controlled Titanate Heterostructures. For 2D films, interface interactions can play a critical role in determining the prevailing physics of the system. In the case of 1ML FeSe on SrTiO3, interfacial electron-phonon (e-ph) coupling greatly increases its superconducting Tc over its bulk counterpart.

(e),(f) EDCs taken at the momentum pointed to by arrows in (b)–(d).

High-resolution ARPES study of FeSe superconductors 著者 PHAN Giao Ngoc number 82 学位授与機関 Tohoku University 学位授与番号理博第3147号 We report results on epitaxial FeSe thin films grown by pulsed laser deposition (PLD) on CaF2 (001) substrates as obtained by exploiting the advantages of an all-in-situ ultra-high vacuum (UHV) laboratory allowing for direct high-resolution surface analysis by scanning tunnelling microscopy (STM), synchrotron radiation X-ray photoelectron spectroscopy (XPS) and angle-resolved photoemission Nano-ARPES measurements were performed using the k microscope at the ANTARES beamline at the Soleil synchrotron, Paris, with a spot size of 100 nm. At a photon energy of 100 eV, this beamline has an angular resolution of ∼0.2 and an energy resolution of ∼10 meV. The advantage of the nano-ARPES technique for the study of ReS 2 is that (b) ARPES spectra taken along the Γ−M direction on a twinned FeSe. (c),(d) ARPES spectra taken on detwinned FeSe along the Γ−M X and Γ−M Y directions, respectively. (e),(f) EDCs taken at the momentum pointed to by arrows in (b)–(d). All measurements are taken with 70 eV photons under odd polarization with respect to the cut direction. Although ARPES measurements indicated a the distinct pseudogap-like reduction in DOS in the hole pocket above \(T_{\text{c}}\), 116) no discernible reduction in DOS was observed in STS measurements.
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Bogoliubov ARPES: schematic Fermi surfaces of FeSe – 3D. For example, ARPES measurements of FeSe give an exclusive opportunity to investigate the electronic structure in nematic phase without magnetic order. 1 Dec 2020 1 Angle-resolved photoemission spectroscopy (ARPES) measurements on twinned and detwinned FeSe. a Schematic representation of the piezo Bulk FeSe Fermi Surface: Density-Functional Theory vs ARPES. Density Functional Theory in the nonmagnetic phase.

We have revealed the existence of a novel electronic state in an highly unconventional multiband superconductor, FeSe, from the evolution of its electronic structure from the high-temperature tetragonal phase into the electronic nematic phase using angle resolved photoemission spectroscopy (ARPES). Bulk FeSe is an iron-based superconductor that has a maximum Tc of 8K.
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The first ARPES study on single-layer FeSe/STO films has provided key insights substrate by means of angle-resolved photoemission spectroscopy (ARPES).

FeSe PLD growth protocols were ﬁne-tuned by optimizing target-to-substrate distance d and ablation frequency, atomically ﬂat terraces with unit-cell step heights are obtained, overcoming the spiral morphology often observed by others. We report results on epitaxial FeSe thin films grown by pulsed laser deposition (PLD) on CaF2 (001) substrates as obtained by exploiting the advantages of an all-in-situ ultra-high vacuum (UHV) laboratory allowing for direct high-resolution surface analysis by scanning tunnelling microscopy (STM), synchrotron radiation X-ray photoelectron spectroscopy (XPS) and angle-resolved photoemission spectroscopy … 2017-03-01 2017-05-05 2019-10-02 2017-06-09 Enabled by an angle-resolved photoemission spectroscopy beamline with a highly focused beam spot (nano-ARPES), we identify clear stripelike orthorhombic domains in FeSe with a length scale of 2012-07-03 We have revealed the existence of a novel electronic state in an highly unconventional multiband superconductor, FeSe, from the evolution of its electronic structure from the high-temperature tetragonal phase into the electronic nematic phase using angle resolved photoemission spectroscopy (ARPES). Bulk FeSe is an iron-based superconductor that has a maximum Tc of 8K. Surprisingly, the Tc of a single layer of FeSe film grown epitaxially on the SrTiO 3 substrate is enhanced to over 55K. We perform in-situ synchrotron-based MBE/ARPES experiment to understand how the transition temperature can be enhanced from the bulk superconducting transition temperature (Tc) of 8K at this 1UC FeSe/STO … 2017-02-10 Combining Angle resolved photoelectron spectroscopy (ARPES) and a μ-focused Laser, we have performed scanning ARPES microscopy measurements of the domain population within the nematic phase of FeSe single crystals.We are able to demonstrate a variation of the domain population density on a scale of a few 10 μm while constraining the upper limit of the single domain size to less than 5 μm.