5 and 78 K were taken in the magnetic field range 0 < m0H <
5 T. Magnetic susceptibility measurements were performed from
1.8 K to 265 K at 10 Hz and 4.0 Oe amplitude.
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This work was supported by the Spanish MICINN (DG-
PTC)/FEDER (Projects CTQ2008-06669-C02-01/BQU and
MAT2008-03461/MAT) and the Gobierno de Arago´n (Grupo
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