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

av A Aperis — theory calculations for a monolayer FeSe on SrTiO3 highlight the importance of Evaluates experimental quantities like ARPES, STS and London penetration

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. c,d) Spectra and its second derivative taken at zone corner M, along the cut shown with the white line in (b). (b) ARPES spectra taken along the Γ−M direction on a twinned FeSe.

Arpes fese

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 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 can be used to simulate several experimental quantities like e.g. ARPES and MgB2 and H-MgB2 monolayers, heterostructures like FeSe/SrTiO3, high-Tc av A Aperis — theory calculations for a monolayer FeSe on SrTiO3 highlight the importance of Evaluates experimental quantities like ARPES, STS and London penetration Eliashberg theory for spin fluctuation mediated superconductivity: Application to bulk and monolayer FeSe2020Ingår i: Physical Review B, ISSN 2469-9950, såsom STM och vinkel-löst photoemission spektroskopi (ARPES), angle-resolved photo-emission spectroscopy measurements of FeSe. 1 (till höger) visar Fermi-ytan av BSCCO mätt med ARPES .

in bulk FeSe samples [6]. In this wide temperature range, the system shows a marked electron nematicity in transport [7]. Angle-resolved photoemission spectroscopy (ARPES) =L.F. and J.M. contributed equally to this work. *Corresponding author: veronique.brouet@u-psud.fr investigations [8–12] have revealed a 50 meV splitting at

In this wide temperature range, the system shows a marked electron nematicity in transport [7]. Angle-resolved photoemission spectroscopy (ARPES) =L.F. and J.M. contributed equally to this work. *Corresponding author: veronique.brouet@u-psud.fr investigations [8–12] have revealed a 50 meV splitting at 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.

23 Feb 2018 We present a systematic angle-resolved photoemission spectroscopy study of the superconducting gap in FeSe. The gap function is determined

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 We have performed in-situ angle-resolved photoemission spectroscopy measurements of cesium(Cs)-deposited FeSe thin films on SrTiO 3. We found that Cs deposition enables heavily electron doping into the FeSe layer.

The gap function is determined 2020年6月8日 We measure the electronic structure of FeSe from within individual (nano- ARPES), we identify clear stripelike orthorhombic domains in FeSe In addition to the ARPES and quantum oscillations, Hall data also carries useful information about the electronic structure.
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Surprisingly, the Tc of a single layer of FeSe film grown epitaxially on the SrTiO 3 substrate is enhanced to over 55K.

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.
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The FeSe superconductor and its related systems have attracted much attention in the iron-based superconductors owing to their simple crystal structure and peculiar electronic and physical properties. The bulk FeSe superconductor has a superconducting transition temperature (Tc) of ~8 K; it can be dramatically enhanced to 37 K at high pressure.

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 m while constraining the upper limit of the single High‐temperature superconductivity at the FeSe/SrTiO3 interface Yuan‐Yuan Xiang, Fa wang, DA Wang, Qiang‐Hua Wang, and Dong‐Hai Lee. Phys.

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spectroscopy (XPS) and angle-resolved photoemission spectroscopy (ARPES) on fresh surfaces. 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 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. 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. 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 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.