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DS: Fachverband Dünne Schichten
DS 34: Focus Session: Frontiers of Electronic-Structure Theory: Correlated Electron Materials VII (joint session O/TT/MM/DS/CPP)
DS 34.3: Talk
Thursday, March 15, 2018, 15:45–16:00, HL 001
High temperature superconducting oxychlorides: a light element model for cuprates — •Matteo d’Astuto1,2, Blair Lebert2,3, Ikuya Yamada4, and Masaki Azuma5 — 1Institut NEEL CNRS/UGA UPR2940 25 rue des Martyrs BP 166 38042 Grenoble cedex 9 FRANCE — 2IMPMC, UMR7590 UPMC-Sorbonne Universités - CNRS, Paris, France — 3Synchrotron SOLEIL, Gif-sur-Yvette, France — 4Nanoscience and Nanotechnology Research Center (N2RC), Osaka, Japan — 5Materials and Structures Laboratory, TITech, Yokohama, Japan
The copper oxychloride cuprate Ca2CuO2Cl2 (CCOC) system, with vacancy or Na doping on the Ca site, is unique among the high temperature superconducting cuprates (HTSCs) since it: lacks high Z atoms; has a simple I4/mmm 1-layer structure, typical of 214 (LSCO) cuprates, but which is stable at all doping and temperatures; and has a strong 2D character due to the replacement of apical oxygen with chlorine. It also shows a remarkable phase digram, with a superconducting TC growing to the optimal doping without any minimum around 1/8 doping, despite the observation of charge modulations by near-field spectro-microscopy. Due to the reduced number of electrons, advanced calculations that incorporate correlation effects, such as quantum Monte Carlo are easier, but relatively little is known about CCOC (for a cuprate) from an experimental point of view. We are now filling this gap by a comprehensive experimental study covering the whole phase diagram, in particular of the (para)magnon and phonon dispersion..