2019-10-02 · However, correlations strongly renormalize the bands compared to electronic structure calculations, and there is no evidence for the expected bulk band inversion. We present here a comprehensive angle resolved photoemission (ARPES) study of FeSeTe as function of photon energies ranging from 15 - 100 eV.
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.
This work was supported by the U.S. Department of Energy, Office of Science, Basic Energy Sciences, Materials Sciences and Engineering Division under contract DE-AC02-76SF00515. 2017-10-20 Here, we report high resolution angle resolved photoemission spectroscopy (ARPES) results which reveal an unexpected and unique characteristic of the 1UC FeSe/STO system: each energy band of the FeSe film is almost exactly replicated at a fixed energy separation. 2017-05-08 2017-07-01 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.
We are able to demonstrate a variation of the domain population density on a scale of a few 10 μmwhile constraining the upper limit of This is confirmed by performing ARPES on FeSe single crystals, whereby a 25-meV rigid chemical potential shift is detected across the entire Brillouin zone over the temperature range between 100 K and 300 K. The finding has important implications for any future theoretical models of nematicity and superconductivity in FeSe and related materials. the low temperature Fermi surface of FeSe as experimentally determined by ARPES consists of one ellipti-cal hole pocket and one orthogonally-oriented peanut-shaped electron pocket. Our measurements clarify the long-standing controversies over the interpretation of ARPES measurements of FeSe. INTRODUCTION 2012-07-03 · Direct-ARPES and STM Investigation of FeSe Thin Film Growth by Nd:YAG Laser Sandeep Kumar Chaluvadi, Debashis Mondal, Chiara Bigi, Jun Fujii, Rajdeep Adhikari, Regina Ciancio 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 during ARPES experiments. 2015-07-15 · ARPES studies on the monolayer FeSe exhibit a superconducting gap with a size of 15 meV, corresponding to a T c ∼ 55 K , .
1 Dec 2020 1 Angle-resolved photoemission spectroscopy (ARPES) measurements on twinned and detwinned FeSe.
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.
We find significant anisotropy of the superconducting gap in all momentum directions. While the in-plane anisotropy can be explained by both, nematicity-induced pairing anisotropy and ARPES characterizations of 1UC FeSe/5UC LTO/STO films. a) Schematic diagram of the material structure. b) The Fermi surfaces of electron pockets near the zone corner M. Red lines indicate the Brillouin zone edges.
Angle-resolved photoemission spectroscopy (ARPES) is frequently used to to simulate ARPES measurements of various materials — such as FeSe, CoSe,
This work was supported by the U.S. Department of Energy, Office of Science, Basic Energy Sciences, Materials Sciences and Engineering Division under contract DE-AC02-76SF00515. 2017-10-23 · We report high resolution angle-resolved photo-emission spectroscopy (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 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.
Rev. B 86, 134508 (2012) Atomic and electronic structures of FeSe monolayer and bilayer thin films on SrTiO3(001): First‐principles study
The ARPES Lab is designed to maximise the advantages gained from the revolutionary DA30-L hemispherical high-resolution analyser with its patented in-lens deflector. The analyser measures the full 3D surface cone of a band-structure without sample tilt by deflecting the electron trajectories perpendicular to the analyser entrance slit, which allows for:
We present the results of extended theoretical LDA+DMFT calculations for a new iron-pnictide high temperature superconductor NaFeAs compared with the recent high quality angle-resolved photoemission (ARPES) experiments on this system (see arXiv:1409.1537). The universal manifestation of correlation effects in iron-pnictides is narrowing of conducting bands near the Fermi level. Our
ARPES microscopy measurements of the domain population within the nematic phase of FeSe single crystals. We are able to demonstrate a variation of the
Ultrafast Nematic-Orbital Excitation in FeSe. 2019. In this Nature paper, T. Shimojima (RIKEN CEMS) et al.
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a) Schematic diagram of the material structure. b) The Fermi surfaces of electron pockets near the zone corner M. Red lines indicate the Brillouin zone edges. c,d) Spectra and its second derivative taken at zone corner M, along the cut shown with the white line in (b). 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.
This work was supported by the U.S. Department of Energy, Office of Science, Basic Energy Sciences, Materials Sciences and Engineering Division under contract
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. We report high resolution ARPES measurements of detwinned FeSe single crystals.
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This book mainly focuses on the study of the high-temperature superconductor Bi2Sr2CaCu2O8+δ (Bi2212) and single-layer FeSe film grown on SrTiO3 (STO) substrate by means of angle-resolved photoemission spectroscopy (ARPES). It provides the first electronic evidence for … Electronic anisotropies revealed by detwinned ARPES measurements of FeSe Matthew D. Watson,1, Amir A. Haghighirad,2 Luke C. Rhodes,1,3 Moritz Hoesch,1 and Timur K. Kim1, y 1Diamond Light Source, Harwell Campus, Didcot, OX11 0DE, United Kingdom 2Clarendon Laboratory, Department of Physics, University of Oxford, Parks Road, Oxford OX1 3PU, United Kingdom 3Department of Physics, Royal … 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 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 We have performed in-situ angle-resolved photoemission spectroscopy measurements of cesium(Cs)-deposited FeSe thin films on SrTiO 3.