Berlin 2018 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 102: Focus Session: Frontiers of Electronic-Structure Theory: Correlated Electron Materials VII (joint session O/TT/MM/DS/CPP)

O 102.3: Vortrag

Donnerstag, 15. März 2018, 15:45–16:00, HL 001

High temperature superconducting oxychlorides: a light element model for cuprates — •Matteo d’Astuto^1,2, Blair Lebert^2,3, 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 T_C 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..