Berlin 2018 – wissenschaftliches Programm
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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur
KFM 27: Postersession KFM
KFM 27.18: Poster
Donnerstag, 15. März 2018, 15:00–17:00, Poster E
Detection of electronic anisotropies in cuprates by precision x-ray polarimetry with quartz crystals — •Annika Tamara Schmitt1,2, Ingo Uschmann1,2, Kai Sven Schulze1,2, Robert Lötzsch1,2, Hendrik Bernhardt1, 2, Benjamin Grabiger1,2, Berit Marx-Glowna2,3, Yves Joly4, Martin von Zimmermann3, Hasan Yavas3, Hans-Christian Wille3, Eckhart Förster2, Gerhard Paulus1,2, and Ralf Röhlsberger3 — 1Institut für Optik und Quantenelektronik, Friedrich-Schiller-Universität Jena, Max-Wien-Platz 1, D-07743 Jena, Germany — 2Helmholtz-Institut Jena, Helmholtzweg 4, D-07743 Jena, Germany — 3Deutsches Elektronen-Synchrotron DESY, Notkestr. 85, D-22607 Hamburg, Germany — 4Institut Néel , 25 Avenue des Martyrs, F-38042 Grenoble, France
To understand the origin of the high-temperature superconductivity in the cuprates, it is necessary to study the electronic structure of the copper oxides. Information about the electronic structure and symmetry can be obtained by XANES measurements at the Cu K-edge. The combination of x-ray spectroscopy and x-ray polarimetry offers a much more sensitive method to explore electronic anisotropies and magnetic moments, since the absorption depends on the polarization state.Using crossed x-ray polarizers, tiny optical anisotropies caused by electronic anisotropies can be detected. The x-ray polarizers are based on Bragg reflection at scattering angles very close to 90∘. Polarization purities up to 1.2· 10−7 can be reached using quartz polarizers with a 320-reflection at the Cu K-edge.