Coupled commensurate cation and charge modulation in the tunneled structure, Na(0.40(2))MnO(2) |
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Authors: | Kruk Izabela Zajdel Pawel van Beek Wouter Bakaimi Ioanna Lappas Alexandros Stock Chris Green Mark A |
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Affiliation: | NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, United States. |
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Abstract: | Na(0.40(2))MnO(2) belongs to a family of mixed Mn(3+) and Mn(4+) porous oxides that contains both octahedral and square pyramidal Mn-O units. Neutron and synchrotron radiation studies identify the presence of both sodium ordering (T(Na) ≈ 310 K) and Mn charge and orbital ordering. Below T(Na), the centrosymmetric Pbam structure adopts an (ab 4c) supercell of Pnnm symmetry that accommodates a coupled commensurate modulation down the c-axis channels of both Na position and occupancy with Mn valence. |
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