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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 Pr_2−xSr_xNiO_4+d systems — •Avishek Maity^1,2, 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 La_2−xSr_xCuO_4+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 Pr_2−xSr_xNiO_4+d by several synchrotron and neutron diffraction measurements. Pr_2−xSr_xNiO_4+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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