Nano phase separation in oxygen ordered and disordered nickelates and cuprates
The nanoscopic interplay of charge ordering (CDW) and interstitial oxygen ordering in the high temperature superconducting cuprates with excess of oxygen has attracted enormous attention very recently [1-3]. Importantly, it has been shown that CDW and oxygen ordered domains are (i) nano phase separated and (ii) anticorrelated. These results have impressively demonstrated the relevance of excess of oxygen (and how it is distributed) in these materials. Also the excess oxygen materials La2CuO4+d and La2NiO4+d exhibit oxygen ordering and charge stripe ordering reflections. Our recent microdiffraction measurements also show nano phase separation for these materials (regarding charge and oxygen ordering reflections). These La2MO4+d systems (M=Cu, Ni) will allows us to switch "in situ" (i.e. during experiment) between long-range ordered and fully disordered phases by switching between (long range) oxygen ordered and oxygen disordered phases due to different thermal treatment of the samples. The measurement and comparison of the magnetic excitation spectra in (long range) ordered and disordered phases will give us direct insight into the effects of nano phase separation.
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KOMAREK Alexander Christoph; GUO Hanjie; IVANOV Alexandre and SCHMIDT Wolfgang F. (2016). Nano phase separation in oxygen ordered and disordered nickelates and cuprates. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.4-01-1522
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