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Instruments / Technical Area	Publication Details	Published	Actions
I05-ARPES	Superconducting dome and pseudogap endpoint in Bi2201 M. Berben , S. Smit , C. Duffy , Y.-T. Hsu , L. Bawden , F. Heringa , F. Gerritsen , S. Cassanelli , X. Feng , S. Bron , E. Van Heumen , Y. Huang , F. Bertran , T. K. Kim , C. Cacho , A. Carrington , M. S. Golden , N. E. Hussey Physical Review Materials 6 DOI: 10.1103/PhysRevMaterials.6.044804 Show Abstract ▼ Abstract: Once doped away from their parent Mott insulating state, the hole-doped cuprates enter into many varied and exotic phases. The onset temperature of each phase is then plotted versus p —the number of doped holes per copper atom—to form a representative phase diagram. Apart from differences in the absolute temperature scales among the various families, the resultant phase diagrams are strikingly similar. In particular, the p values corresponding to optimal doping ( p opt ∼ 0.16 ) and to the end of the pseudogap phase ( p ∗ ∼ 0.19 – 0.20 ) are essentially the same for all cuprate families bar one: the single-layer Bi-based cuprate Bi 2 + z − y Pb y Sr 2 − x − z La x CuO 6 + δ (Bi2201). This anomaly arises partly due to the complex stoichiometry of this material and also to the different p values inferred from disparate (e.g., bulk or surface) measurements performed on samples with comparable superconducting transition temperatures T c . Here, by combining measurements of the in-plane resistivity in zero and high magnetic fields with angle-resolved photoemission spectroscopy studies in the superconducting and normal state, we argue that the phase diagram of Bi2201 may in fact be similar to that realized in other families. This study therefore brings Bi2201 into the fold and supports the notion of universality of p opt and p ∗ in all hole-doped cuprates.	Apr 2022
I05-ARPES	Momentum-dependent scaling exponents of nodal self-energies measured in strange metal cuprates and modelled using semi-holography S. Smit , E. Mauri , L. Bawden , F. Heringa , F. Gerritsen , E. Van Heumen , Y. K. Huang , T. Kondo , T. Takeuchi , N. E. Hussey , M. Allan , T. K. Kim , C. Cacho , A. Krikun , K. Schalm , H. T. C. Stoof , M. S. Golden Nature Communications 15 DOI: 10.1038/s41467-024-48594-6 Diamond Proposal Number(s): [19403, 22464] Open Access Show Abstract ▼ Abstract: The anomalous strange metal phase found in high-Tc cuprates does not follow the conventional condensed-matter principles enshrined in the Fermi liquid and presents a great challenge for theory. Highly precise experimental determination of the electronic self-energy can provide a test bed for theoretical models of strange metals, and angle-resolved photoemission can provide this as a function of frequency, momentum, temperature and doping. Here we show that constant energy cuts through the nodal spectral function in (Pb,Bi)2Sr2−xLaxCuO6+δ have a non-Lorentzian lineshape, consistent with a self-energy that is k dependent. This provides a new test for aspiring theories. Here we show that the experimental data are captured remarkably well by a power law with a k-dependent scaling exponent smoothly evolving with doping, a description that emerges naturally from anti-de Sitter/conformal-field-theory based semi-holography. This puts a spotlight on holographic methods for the quantitative modelling of strongly interacting quantum materials like the cuprate strange metals.	May 2024

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