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Resonant X-Ray raman spectra of Cu dd excitations in Sr2CuO2Cl2
Halmstad University, School of Business, Engineering and Science. Department of Physics, Uppsala University, Uppsala, Sweden.ORCID iD: 0000-0002-2551-8709
Department of Physics, Uppsala University, Uppsala, Sweden.
Department of Physics, Uppsala University, Uppsala, Sweden.ORCID iD: 0000-0001-7799-8575
Department of Physics, Uppsala University, Uppsala, Sweden & Department of Physics, Boston University, Boston, USA.ORCID iD: 0000-0001-8471-0955
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1998 (English)In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 80, no 23, p. 5204-5207Article in journal (Refereed) Published
Abstract [en]

We present resonant x-ray Raman scattering results on Sr2CuO2Cl2, a model compound for high- Tc superconductors. We demonstrate that the dd excitations can be observed and show that the polarization dependence can be used to identify the dd excitations. We find the transition from the dx2−y2 ground state to the dxy excited state at 1.35 eV and to the degenerate dxz and dyz excited states at 1.7 eV. From analysis of the polarization dependence we conclude that the d3z2−r2 orbital energy is at 1.5 eV and not in the midinfrared (0.5 eV) as recently suggested. We use recent theoretical arguments to show that the d3z2−r2 excitation is accompanied by a local spin flip resulting in a shift upwards of 0.2 eV due to the exchange interaction with the neighboring spins. ©1998 American Physical Society.

Place, publisher, year, edition, pages
College Park, MD: American Physical Society, 1998. Vol. 80, no 23, p. 5204-5207
Keywords [en]
Copper, Electron energy levels, Electron resonance, Electron transitions, Electronic structure, High temperature superconductors, Light absorption, Light polarization, Mathematical models, Raman scattering, X rays, Resonant x ray Raman spectroscopy, Spin flip excitations, Raman spectroscopy
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:hh:diva-39016DOI: 10.1103/PhysRevLett.80.5204ISI: 000074011900045Scopus ID: 2-s2.0-0032496588OAI: oai:DiVA.org:hh-39016DiVA, id: diva2:1315201
Available from: 2019-05-13 Created: 2019-05-13 Last updated: 2019-08-30Bibliographically approved

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Kuiper, Pieter

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