Abstract: We report high resolution ARPES measurements of detwinned FeSe single crystals. 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.

1 Dec 2020 1 Angle-resolved photoemission spectroscopy (ARPES) measurements on twinned and detwinned FeSe. a Schematic representation of the piezo

Nematic phase: the hole pocket distorts, one elongated electron pocket seen by ARPES. DFT calculation We report high resolution ARPES measurements of detwinned FeSe single crystals. 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 In this paper, to our knowledge, we report the first observation of an insulator–superconductor crossover in the iron-based superconductors by performing systematic angle-resolved photoemission (ARPES) measurements on the single-layer FeSe/SrTiO 3 films at various carrier concentrations. At a very low carrier concentration, the spectral The observation of replica bands in single-unit-cell FeSe on SrTiO3 (STO)(001) by angle-resolved photoemission spectroscopy (ARPES) has led to the conjecture that the coupling between FeSe Phase diagram of FeSe 1 − x S x and the suppression of electronic correlations by S substitution. (a) The ARPES map of the high-symmetry cut through top of the Brillouin zone for the tetragonal phase of FeSe 1 − x S x (x = 0, 0.18, 1) at 56–69 eV, together with a calculated slice for FeS in (b).

ARPES. The difference suggests that the. We present the results of detailed first principle electronic band structure calculations for these systems together with comparison with some experimental ARPES FULL TEXT Abstract: The observation of replica bands in single-unit-cell FeSe on SrTiO 3 (STO)(001) by angle-resolved photoemission spectroscopy (ARPES) Angle-resolved photoemission spectroscopy (ARPES) is frequently used to to simulate ARPES measurements of various materials — such as FeSe, CoSe, Abstract—Electronic spectra of typical single FeSe layer superconductor—FeSe monolayer film on SrTiO3 substrate (FeSe/STO) obtained from ARPES data The first ARPES study on single-layer FeSe/STO films has provided key insights into the electronic origin of superconductivity in this system. A phase diagram and The first ARPES study on single-layer FeSe/STO films has provided key insights substrate by means of angle-resolved photoemission spectroscopy (ARPES). The first ARPES study on single-layer FeSe/STO films has provided key insights into the electronic origin of superconductivity in this system.

Ultrafast Nematic-Orbital Excitation in FeSe. 2019. In this Nature paper, T. Shimojima (RIKEN CEMS) et al. use time-resolved ARPES to visualize

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 interface.

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

Based on a series of ARPES measurements to investigate the effect of film thickness on the electron structure, Tan et al. [37] found the FSs of the monolayer FeSe film and the multilayer FeSe film were significantly different ( Fig. 12 ).

ARPES: schematic Fermi surfaces of FeSe –3D Tetragonal phase: smaller pockets and band renormalisations. Nematic phase: the hole pocket distorts, one elongated electron pocket seen by ARPES. DFT calculation We report high resolution ARPES measurements of detwinned FeSe single crystals.
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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 detwinned. The observation of replica bands in single-unit-cell FeSe on SrTiO3 (STO)(001) by angle-resolved photoemission spectroscopy (ARPES) has led to the conjecture that the coupling between FeSe ARPES: schematic Fermi surfaces of FeSe –3D Tetragonal phase: smaller pockets and band renormalisations.

At a very low carrier concentration, the spectral The observation of replica bands in single-unit-cell FeSe on SrTiO3 (STO)(001) by angle-resolved photoemission spectroscopy (ARPES) has led to the conjecture that the coupling between FeSe Phase diagram of FeSe 1 − x S x and the suppression of electronic correlations by S substitution. (a) The ARPES map of the high-symmetry cut through top of the Brillouin zone for the tetragonal phase of FeSe 1 − x S x (x = 0, 0.18, 1) at 56–69 eV, together with a calculated slice for FeS in (b). The solid line indicates the cuts used Recent ARPES results show that after FeSe films enter the high-T c phase via surface K dosing, the electron correlation anomalously increases upon further doping, and eventually, an insulating phase emerges .
Mohandas karamchand gandhi

Observationen av replikband i FeSe med en enhetscell på SrTiO 3 (STO) (001) med vinkelupplöst fotoemissionsspektroskopi (ARPES) har lett till antagandet att

Abstract: We report high resolution ARPES measurements of detwinned FeSe single crystals. 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.

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1 (till höger) visar Fermi-ytan av BSCCO mätt med ARPES . i den järnbaserade superledarfamiljen finns i tunna filmer av FeSe, där en kritisk

[37] found the FSs of the monolayer FeSe film and the multilayer FeSe film were significantly different ( Fig. 12 ). Recent ARPES results show that after FeSe films enter the high-T c phase via surface K dosing, the electron correlation anomalously increases upon further doping, and eventually, an insulating phase emerges . This indicates remarkable complexity and new physics in the “overdoped” region. FeSe is a fascinating superconducting material at the frontier of research in condensed matter physics. Here, we provide an overview of the current understanding of the electronic structure of FeSe, focusing in particular on its low-energy electronic structure as determined from angle-resolved photoemission spectroscopy, quantum oscillations, and magnetotransport measurements of single-crystal in bulk FeSe samples [6].