Investigation of the exotic magnetic ground state in cycled Na07CoO2
NaxCoO2 (NCO) is famous for its exotic phase-diagram that changes dramatically with the number of conduction electrons on the transition metal oxides layer. Most of the reported studies were based on samples growth by the solid-state reaction method, which is known for producing samples with inhomogeneous Na content. It has become evident that the potential landscape from ordered Na-vacancies plays an important role for the ground state of this material. Lately, the NCO compound has gone through somewhat of a revival, driven by the energy storage community and industry. This has resulted in the realization of electrochemically cycled (in a battery cell) NCO samples. We propose a powder neutron diffraction study of homogenous and well-ordered Na0.7CoO2 samples grown by the electrochemical method. In detail, this sample started out as an “as grown” (non-cycled) x = 0.7 sample and has then been subjected to a full battery charge/discharge cycle by an electrochemical process, returning it to x = 0.7 composition. Muon spin rotation (μ+SR) measurement on this sample revealed a magnetic phase below T = 20 K, which was not existing in the solid-state sample.
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Ola Kenji Forslund; Calvin J. Brett; DELMAS Claude; Thomas C. Hansen; MANSSON MARTIN; NOCERINO Elisabetta; Stephan V. Roth; Yasmine Sassa; SUGIYAMA Jun and TJERNBERG Oscar. (2018). Investigation of the exotic magnetic ground state in cycled Na07CoO2. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.5-31-2613
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