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Instruments / Technical Area	Publication Details	Published	Actions
I09-Surface and Interface Structural Analysis	Toward functionalized ultrathin oxide films: the impact of surface apical oxygen Judith Gabel , Matthias Pickem , Philipp Scheiderer , Lenart Dudy , Berengar Leikert , Marius Fuchs , Martin Stübinger , Matthias Schmitt , Julia Kuespert , Giorgio Sangiovanni , Jan M. Tomczak , Karsten Held , Tien-Lin Lee , Ralph Claessen , Michael Sing Advanced Electronic Materials 102 DOI: 10.1002/aelm.202101006 Diamond Proposal Number(s): [23737, 25151] Open Access Show Abstract ▼ Abstract: Thin films of transition metal oxides open up a gateway to nanoscale electronic devices beyond silicon characterized by novel electronic functionalities. While such films are commonly prepared in an oxygen atmosphere, they are typically considered to be ideally terminated with the stoichiometric composition. Using the prototypical correlated metal SrVO3 as an example, it is demonstrated that this idealized description overlooks an essential ingredient: oxygen adsorbing at the surface apical sites. The oxygen adatoms, which are present even if the films are kept in an ultrahigh vacuum environment and not explicitly exposed to air, are shown to severely affect the intrinsic electronic structure of a transition metal oxide film. Their presence leads to the formation of an electronically dead surface layer but also alters the band filling and the electron correlations in the thin films. These findings highlight that it is important to take into account surface apical oxygen or—mutatis mutandis—the specific oxygen configuration imposed by a capping layer to predict the behavior of ultrathin films of transition metal oxides near the single unit-cell limit.	Dec 2021
I21-Resonant Inelastic X-ray Scattering (RIXS)	Charge order lock-in by electron-phonon coupling in La1.675Eu0.2Sr0.125CuO4 Qisi Wang , Karin Von Arx , Masafumi Horio , Deepak John Mukkattukavil , Julia Kuespert , Yasmine Sassa , Thorsten Schmitt , Abhishek Nag , Sunseng Pyon , Tomohiro Takayama , Hidenori Takagi , Mirian Garcia-Fernandez , Ke-Jin Zhou , Johan Chang Science Advances 7 DOI: 10.1126/sciadv.abg7394 Diamond Proposal Number(s): [24481] Open Access Show Abstract ▼ Abstract: Charge order is universal to all hole-doped cuprates. Yet, the driving interactions remain an unsolved problem. Electron-electron interaction is widely believed to be essential, whereas the role of electron-phonon interaction is unclear. We report an ultrahigh-resolution resonant inelastic x-ray scattering (RIXS) study of the in-plane bond-stretching phonon mode in stripe-ordered cuprate La1.675Eu0.2Sr0.125CuO4. Phonon softening and lifetime shortening are found around the charge ordering wave vector. In addition to these self-energy effects, the electron-phonon coupling is probed by its proportionality to the RIXS cross section. We find an enhancement of the electron-phonon coupling around the charge-stripe ordering wave vector upon cooling into the low-temperature tetragonal structure phase. These results suggest that, in addition to electronic correlations, electron-phonon coupling contributes substantially to the emergence of long-range charge-stripe order in cuprates.	Jun 2021

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