and the Generalitat Valenciana (Prometeo Programme of Excellence) A. G.-A. acknowledges funding by the MINECO (Ramón y Cajal contract) acknowledge the Blaise Pascal International Chair for financial support. S. C.-S. acknowledges the Generalitat Valenciana for a VALi+D postdoctoral grant. We thank J. M. Martínez-Agudo for performing the magnetic measurements. Notes and references 1, Science, vol.294, pp.1488-1495, 2001. ,
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