Regensburg 2019 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 59: Complex Oxides Interfaces and Charge Order
TT 59.10: Vortrag
Donnerstag, 4. April 2019, 17:30–17:45, H22
Correlation between charge- and oxygen-ordering in 214-type hole-doped Pr2−xSrxNiO4+d systems — •Avishek Maity1,2, Rajesh Dutta2, Laura Guasco3, Alexie Bossak4, Monica Ceretti3, and Werner Paulus3 — 1Georg-August-Universität-Goettingen, Göttingen, 37077 Germany — 2Heinz Maier-Leibnitz Zentrum (MLZ), Garching, 85747 Germany — 3Université de Montpellier, Montpellier, 34095 France — 4The European Synchrotron-ESRF, Grenoble, 38000 France
The research on charge-ordered (CO) stripes in 214-type cobaltates/nickelates has become a fertile territory of research in the last two decades after they were experimentally evidenced in homologous superconducting cuprates La2−xSrxCuO4+d[1]. Although contentious, fluctuation of such organized quantum mater e.g. stripe is believed to be responsible for high-Tc superconductivity [2]. What still remains poorly discussed, is the influence of nonstoichiometric interstitial oxygen (Oint) on the organization of holes in a line shape. We have investigated CO state in Pr2−xSrxNiO4+d by several synchrotron and neutron diffraction measurements. Pr2−xSrxNiO4+d being a potential O-ion conductor, the high mobility of Oint gives rise to a complex long-range O-ordering even at RT. Investigating different doping level, we have found that the spacing in between the stripes is defined by the Oint-ordered supercell. I will present the relation between O-order and CO and the effect on CO correlation.
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