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Instruments / Technical Area	Publication Details	Published
I21-Resonant Inelastic X-ray Scattering (RIXS)	Correlation driven near-flat band Stoner excitations in a Kagome magnet Abhishek Nag , Yiran Peng , Jiemin Li , Stefano Agrestini , Hannah C. Robarts , Mirian Garcia-Fernandez , Andrew C. Walters , Qi Wang , Qiangwei Yin , Hechang Lei , Zhiping Yin , Ke-Jin Zhou Nature Communications 13 DOI: 10.1038/s41467-022-34933-y Diamond Proposal Number(s): [27905] Open Access Show Abstract ▼ Abstract: Among condensed matter systems, Mott insulators exhibit diverse properties that emerge from electronic correlations. In itinerant metals, correlations are usually weak, but can also be enhanced via geometrical confinement of electrons, that manifest as ‘flat’ dispersionless electronic bands. In the fast developing field of topological materials, which includes Dirac and Weyl semimetals, flat bands are one of the important components that can result in unusual magnetic and transport behaviour. To date, characterisation of flat bands and their magnetism is scarce, hindering the design of novel materials. Here, we investigate the ferromagnetic Kagomé semimetal Co3Sn2S2 using resonant inelastic X-ray scattering. Remarkably, nearly non-dispersive Stoner spin excitation peaks are observed, sharply contrasting with the featureless Stoner continuum expected in conventional ferromagnetic metals. Our band structure and dynamic spin susceptibility calculations, and thermal evolution of the excitations, confirm the nearly non-dispersive Stoner excitations as unique signatures of correlations and spin-polarized electronic flat bands in Co3Sn2S2. These observations serve as a cornerstone for further exploration of band-induced symmetry-breaking orders in topological materials.	Nov 2022
I21-Resonant Inelastic X-ray Scattering (RIXS)	Spectroscopic fingerprint of charge order melting driven by quantum fluctuations in a cuprate W. S. Lee , K. Zhou , M. Hepting , J. Li , A. Nag , A. C. Walters , M. Garcia-Fernandez , H. C. Robarts , M. Hashimoto , H. Lu , B. Nosarzewski , D. Song , H. Eisaki , Z. X. Shen , B. Moritz , J. Zaanen , T. P. Devereaux Nature Physics 518 DOI: 10.1038/s41567-020-0993-7 Diamond Proposal Number(s): [18462] Show Abstract ▼ Abstract: Copper oxide high-TC superconductors possess a number of exotic orders that coexist with or are proximal to superconductivity. Quantum fluctuations associated with these orders may account for the unusual characteristics of the normal state, and possibly affect the superconductivity. Yet, spectroscopic evidence for such quantum fluctuations remains elusive. Here, we use resonant inelastic X-ray scattering to reveal spectroscopic evidence of fluctuations associated with a charge order in nearly optimally doped Bi2Sr2CaCu2O8+δ. In the superconducting state, while the quasielastic charge order signal decreases with temperature, the interplay between charge order fluctuations and bond-stretching phonons in the form of a Fano-like interference increases, an observation that is incompatible with expectations for competing orders. Invoking general principles, we argue that this behaviour reflects the properties of a dissipative system near an order–disorder quantum critical point, where the dissipation varies with the opening of the pseudogap and superconducting gap at low temperatures, leading to the proliferation of quantum critical fluctuations, which melt charge order.	Aug 2020
I21-Resonant Inelastic X-ray Scattering (RIXS)	Multiorbital charge-density wave excitations and concomitant phonon anomalies in Bi2Sr2LaCuO6+δ Jiemin Li , Abhishek Nag , Jonathan Pelliciari , Hannah Robarts , Andrew Walters , Mirian Garcia-Fernandez , Hiroshi Eisaki , Dongjoon Song , Hong Ding , Steven Johnston , Riccardo Comin , Ke-Jin Zhou Proceedings Of The National Academy Of Sciences 89 DOI: 10.1073/pnas.2001755117 Diamond Proposal Number(s): [19886, 21184, 21277] Open Access Show Abstract ▼ Abstract: Charge-density waves (CDWs) are ubiquitous in underdoped cuprate superconductors. As a modulation of the valence electron density, CDWs in hole-doped cuprates possess both Cu-3d and O-2p orbital character owing to the strong hybridization of these orbitals near the Fermi level. Here, we investigate underdoped Bi2Sr1.4La0.6CuO6+δ using resonant inelastic X-ray scattering (RIXS) and find that a short-range CDW exists at both Cu and O sublattices in the copper-oxide (CuO2) planes with a comparable periodicity and correlation length. Furthermore, we uncover bond-stretching and bond-buckling phonon anomalies concomitant to the CDWs. Comparing to slightly overdoped Bi2Sr1.8La0.2CuO6+δ, where neither CDWs nor phonon anomalies appear, we highlight that a sharp intensity anomaly is induced in the proximity of the CDW wavevector (QCDW) for the bond-buckling phonon, in concert with the diffused intensity enhancement of the bond-stretching phonon at wavevectors much greater than QCDW. Our results provide a comprehensive picture of the quasistatic CDWs, their dispersive excitations, and associated electron-phonon anomalies, which are key for understanding the competing electronic instabilities in cuprates.	Jun 2020

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