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We studied theoretically the crystal field and Zeeman split electronic levels of trivalent rare earths that are distributed over trigonal prismatic sites of the layered Rx/3CoO2 system (closely related to sodium cobaltate NaxCoO2). The calculations were done in the whole basis of 4f n configurations (up to 3000 many-electron determinantal functions) for the ideal trigonal symmetry D3h, as...
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