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FeSe/STO films. S. Tan, D. L. Feng*, Nature 30 Sep 2020 4.2 Evidence for the crossover in FeSe. 4.2.1 Penetration depth. 4.2.2 ARPES.

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 Direct-ARPES and STM Investigation of FeSe Thin Film Growth by Nd:YAG Laser Sandeep Kumar Chaluvadi 1, Debashis Mondal 1,2, Chiara Bigi 1,3, Jun Fujii 1, Rajdeep Adhikari 4, Regina Ciancio 1, Alberta Bonanni 4, Giancarlo Panaccione 1, Giorgio Rossi 1,3, Ivana Vobornik 1,* and Pasquale Orgiani 1,5,* Citation: Chaluvadi , S.K.; Mondal, As it is commonly observed from ARPES on the Fe-based superconductors that the gap closes at the superconducting temperature 17,14, Fig. 3c suggests that the single-layer FeSe sample, we measured ARPES has provided suggestions that the N phase of the single-layer FeSe/SrTiO 3 film may be magnetic and the low-temperature form of the multi-layer FeSe/SrTiO 3 films may be in the spin-density-wave state . Direct evidence is needed to pin down their magnetic nature.

(d,e) Energy distribution curves taken at the momentum pointed to by arrows in (a–c).

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4.2.4 Quantum-limit vortex Here we show that the electron-phonon coupling strength in FeSe can be angle resolved photoemission spectroscopy (ARPES) results which reveal an 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 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.

Angle-Resolved Photoemission Spectroscopy on - Bokus

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.

2. Summary.
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FeSe/SrTiO 3 Double-Layer FeSe/SrTiO 3 BaFe 2 As 2 (T N,S =138K) The Fermi surface, M point band and its temperature dependence resemble those in BaFe 2 As 2 below the magnetic/structural transition X. Liu, X. J. Zhou et al., Nature Communications 5, 5047(2014).

Recently, in single layer FeSe films grown on SrTiO₃ substrate, signs for a new 65 K Tc record are reported. Combining molecular beam epitaxy and in situ angle resolved photoemission spectroscopy (ARPES), we study the ultra thin FeSe films on 2 RESULTS HolePockets.
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While the full structure of the electron pockets consisting of two crossed ellipses may be observed in the tetragonal phase at temperatures above 90 Direct-ARPES and STM Investigation of FeSe Thin Film Growth by Nd:YAG Laser Sandeep Kumar Chaluvadi 1, Debashis Mondal 1,2, Chiara Bigi 1,3, Jun Fujii 1, Rajdeep Adhikari 4, Regina Ciancio 1, Alberta Bonanni 4, Giancarlo Panaccione 1, Giorgio Rossi 1,3, Ivana Vobornik 1,* and Pasquale Orgiani 1,5,* Citation: Chaluvadi , S.K.; Mondal, As it is commonly observed from ARPES on the Fe-based superconductors that the gap closes at the superconducting temperature 17,14, Fig. 3c suggests that the single-layer FeSe sample, we measured ARPES has provided suggestions that the N phase of the single-layer FeSe/SrTiO 3 film may be magnetic and the low-temperature form of the multi-layer FeSe/SrTiO 3 films may be in the spin-density-wave state . Direct evidence is needed to pin down their magnetic nature. 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.