Self-doping processes between planes and chains in the metal-to-superconductor transition of YBa2Cu3O6.9

Magnuson, MartinLinköpings universitet,Tunnfilmsfysik,Tekniska högskolan,Linköping University (author)

The interplay between the quasi 1-dimensional CuO-chains and the 2-dimensional CuO2 planes of YBa2Cu3O61x (YBCO) has been in focus for a long time. Although the CuO-chains are known to be important as charge reservoirs that enable superconductivity for a range of oxygen doping levels in YBCO, the understanding of the dynamics of its temperature-driven metal-superconductor transition (MST) remains a challenge. We present a combined study using x-ray absorption spectroscopy and resonant inelastic x-ray scattering (RIXS) revealing how a reconstruction of the apical O(4)-derived interplanar orbitals during the MST of optimally doped YBCO leads to substantial hole-transfer from the chains into the planes, i.e. self-doping. Our ionic model calculations show that localized divalent charge-transfer configurations are expected to be abundant in the chains of YBCO. While these indeed appear in the RIXS spectra from YBCO in the normal, metallic, state, they are largely suppressed in the superconducting state and, instead, signatures of Cu trivalent charge-transfer configurations in the planes become enhanced. In the quest for understanding the fundamental mechanism for high-Tc-superconductivity (HTSC) in perovskite cuprate materials, the observation of such an interplanar self-doping process in YBCO opens a unique novel channel for studying the dynamics of HTSC.

NATURVETENSKAP Fysik Den kondenserade materiens fysik hsv//swe
NATURAL SCIENCES Physical Sciences Condensed Matter Physics hsv//eng
TEKNIK OCH TEKNOLOGIER Elektroteknik och elektronik hsv//swe
ENGINEERING AND TECHNOLOGY Electrical Engineering, Electronic Engineering, Information Engineering hsv//eng
high temperature superconductor
resonant inelastic x-ray scattering
x-ray absorption spectroscopy
Fysik med inriktning mot atom- molekyl- och kondenserande materiens fysik
Physics with spec. in Atomic, Molecular and Condensed Matter Physics

Schmitt, ThorstenPaul Scherrer Institut, Swiss Light Source (SLS), Villigen, Switzerland (author)
Strocov, Vladimir N.Paul Scherrer Institut, Swiss Light Source (SLS), Villigen, Switzerland (author)
Schlappa, JustinaPaul Scherrer Institut, Swiss Light Source (SLS), Villigen, Switzerland,Helmholtz Zentrum,Helmholtz Center (author)
Kalaboukhov, Alexei,1975Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)ascry (author)
Duda, Laurent-Claudius,1965-Uppsala universitet,Molekyl- och kondenserade materiens fysik,Uppsala University, Sweden(Swepub:uu)laurduda (author)
Kalabukhov, AlexChalmers University of Technology, Gothenburg, Sweden (author)
Linköpings universitetTunnfilmsfysik (creator_code:org_t)

In:Scientific Reports: Springer Science and Business Media LLC4, s. 7017-2045-2322

By the author/editor: Magnuson, Martin; Schmitt, Thorste ...; Strocov, Vladimi ...; Schlappa, Justin ...; Kalaboukhov, Ale ...; Duda, Laurent-Cl ...; show more...; Kalabukhov, Alex; show less...

About the subject

NATURAL SCIENCES: NATURAL SCIENCES; and Physical Science ...; and Condensed Matter ...

By the university: Uppsala University; Linköping University; Chalmers University of Technology

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