title: Competing magnetism and superconductivity in Na(x)CoO2 at half doping.
abstract: We report the effect of topotactic replacement of Na(+) by H(3)O(+) in Na(0.5)CoO(2). Hydronium ions keep the Co oxidation state constant, increasing the interlayer distance. The result is a progressive destruction of the spin density wave characteristic of half-doped Na(x)CoO(2) and ultimately the induction of superconductivity. This implies that superconductivity occurs closer to Co(3+)/Co(4+) approximately = 1 than previously thought and that its development competes with the development of the magnetic phase.
authors: Department of Physical Chemistry, University of Santiago de Compostela, 15782 Santiago de Compostela, Spain.
authors: Manuel
authors: M
authors: Bañobre-López
authors: Francisco
authors: F
authors: Rivadulla
authors: M Arturo
authors: MA
authors: López-Quintela
authors: José
authors: J
authors: Rivas