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Instruments / Technical Area	Publication Details	Published
Theoretical Physics	FeSe and the missing electron pocket problem Luke C. Rhodes , Matthias Eschrig , Timur K. Kim , Matthew D. Watson Frontiers In Physics 10 DOI: 10.3389/fphy.2022.859017 Open Access Show Abstract ▼ Abstract: The nature and origin of electronic nematicity remains a significant challenge in our understanding of the iron-based superconductors. This is particularly evident in the iron chalcogenide, FeSe, where it is currently unclear how the experimentally determined Fermi surface near the M point evolves from having two electron pockets in the tetragonal state, to exhibiting just a single electron pocket in the nematic state. This has posed a major theoretical challenge, which has become known as the missing electron pocket problem of FeSe, and is of central importance if we wish to uncover the secrets behind nematicity and superconductivity in the wider iron-based superconductors. Here, we review the recent experimental work uncovering this nematic Fermi surface of FeSe from both ARPES and STM measurements, as well as current theoretical attempts to explain this missing electron pocket of FeSe, with a particular focus on the emerging importance of incorporating the dxy orbital into theoretical descriptions of the nematic state. Furthermore, we will discuss the consequence this missing electron pocket has on the theoretical understanding of superconductivity in this system and present several remaining open questions and avenues for future research.	May 2022
B21-High Throughput SAXS	Transparent colloidal crystals with structural colours Talha Erdem , Thomas O'Neill , Mykolas Zupkauskas , Alessio Caciagli , Peicheng Xu , Yang Lan , Peter Bösecke , Erika Eiser Frontiers In Physics 10 DOI: 10.3389/fphy.2022.847142 Open Access Show Abstract ▼ Abstract: Spatially ordered arrangements of spherical colloids are known to exhibit structural colours. The intensity and brilliance of these structural colours typically improve with colloidal monodispersity, low concentrations of point and line defects and with increasing refractive index contrast between the colloids and the embedding medium. Here we show that suspensions of charge stabilised, fluorinated latex particles with low refractive-index contrast to their aqueous background form Wigner crystals with FCC symmetry for volume fractions between 13 and 40%. In reflection they exhibit both strong, almost angle-independent structural colours and sharp, more brilliant Bragg peaks despite the particle polydispersity and bimodal distribution. Simultaneously, these suspensions appear transparent in transmission. Furthermore, binary AB, A2B and A13B type mixtures of these fluorinated and similarly sized polystyrene particles appeared predominantly white but with clear Bragg peaks indicating a CsCl-like BCC structure and more complex crystals. We characterised the suspensions using a combination of reflectivity measurements and small-angle x-ray scattering, complemented by reflectivity modelling.	Mar 2022
I05-ARPES	Electronic nematic states tuned by isoelectronic substitution in bulk FeSe1−xSx Amalia I. Coldea Frontiers In Physics 8 DOI: 10.3389/fphy.2020.594500 Open Access Show Abstract ▼ Abstract: Isoelectronic substitution is an ideal tuning parameter to alter electronic states and correlations in iron-based superconductors. As this substitution takes place outside the conducting Fe planes, the electronic behaviour is less affected by the impurity scattering experimentally and relevant key electronic parameters can be accessed. In this short review, I present the experimental progress made in understanding the electronic behaviour of the nematic electronic superconductors, FeSe1−xSx. A direct signature of the nematic electronic state is in-plane anisotropic distortion of the Fermi surface triggered by orbital ordering effects and electronic interactions that result in multi-band shifts detected by ARPES. Upon sulphur substitution, the electronic correlations and the Fermi velocities decrease in the tetragonal phase. Quantum oscillations are observed for the whole series in ultra-high magnetic fields and show a complex spectra due to the presence of many small orbits. Effective masses associated to the largest orbit display non-divergent behaviour at the nematic end point (x ∼ 0.175(5)), as opposed to critical spin-fluctuations in other iron pnictides. Magnetotransport behaviour has a strong deviation from the Fermi liquid behaviour and linear T resistivity is detected at low temperatures inside the nematic phase, where scattering from low energy spin-fluctuations are likely to be present. The superconductivity is not enhanced in FeSe1−xSx and there are no divergent electronic correlations at the nematic end point. These manifestations indicate a strong coupling with the lattice in FeSe1−xSx and a pairing mechanism likely promoted by spin fluctuations.	Mar 2021
I05-ARPES	Carrier balance and linear magnetoresistance in type-II Weyl semimetal WTe2 Xing-Chen Pan , Yiming Pan , Juan Jiang , Huakun Zuo , Huimei Liu , Xuliang Chen , Zhongxia Wei , Shuai Zhang , Zhihe Wang , Xiangang Wan , Zhaorong Yang , Donglai Feng , Zhengcai Xia , Liang Li , Fengqi Song , Baigeng Wang , Yuheng Zhang , Guanghou Wang Frontiers Of Physics 12 DOI: 10.1007/s11467-016-0629-7 Diamond Proposal Number(s): [10213] Show Abstract ▼ Abstract: Unsaturated magnetoresistance (MR) has been reported in type-II Weyl semimetal WTe2, manifested as a perfect compensation of opposite carriers. We report linear MR (LMR) in WTe2 crystals, the onset of which was identified by constructing the MR mobility spectra for weak fields. The LMR further increased and became dominant for fields stronger than 20 T, while the parabolic MR gradually decayed. The LMR was also observed in high-pressure conditions.	Jun 2017

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