Supraledning vid hög temperatur - High-temperature

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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. The Hall resistivity ρxy at ambient Nematic order and the superconducting gap in FeSe. Matt Watson The nematic phase of FeSe. 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.

We performed ARPES measurements in order to demonstrate experimentally the existence of the Γ − 2 band with strong p z orbital character crossing E F along the Γ-Z direction.Large single-crystals of FeSe 0.45 Te 0.55 were grown using the self-flux method, and LiFeAs with FeAs flux method. ARPES measurements were performed at the Advanced Light Source and Synchrotron Radiation Center, using 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 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. 2015-09-08 ARPES and inelastic neutron spectra measured on twinned and detwinned FeSe [15, 46, 66].

Angle-Resolved Photoemission Spectroscopy on - Bokus

use time-resolved ARPES to visualize Experimental setup----OMBE+MBE+ARPES. 1. Heterostructure Design and in- situ ARPES study. 2.

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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. 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. 2014-12-30 Here we present the influence of different STO surface terminations and photon energy dependent ARPES results which help to clarify the role of the substrate in the monolayer FeSe system. 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.

The N Phase in as-prepared FeSe/SrTiO 3 is likely magnetic.
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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. 2014-12-30 Here we present the influence of different STO surface terminations and photon energy dependent ARPES results which help to clarify the role of the substrate in the monolayer FeSe system. 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.

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]. In this wide temperature range, the system shows a marked electron nematicity in transport [7].
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A phase diagram Evidence for unidirectional nematic bond ordering in FeSe Termination- dependent electronic structure of LaFeAsO revealed by nano-ARPES. S Jung, M By combining the findings of the low temperature electronic structure from ARPES and quantum oscillations we have established for the fisrt time that FeSe We report angle-resolved photoemission spectroscopy (ARPES) study on atomic- layer FeSe films grown on SrTiO_3 substrate. We observed that a monolayer 23 Feb 2018 We present a systematic angle-resolved photoemission spectroscopy study of the superconducting gap in FeSe. 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. The Hall resistivity ρxy at ambient Nematic order and the superconducting gap in FeSe.

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Matt Watson The nematic phase of FeSe.

Our measurements clarify the long-standing controversies over the interpretation of ARPES measurements of FeSe.