Physics – Condensed Matter – Superconductivity
Scientific paper
2007-11-28
JACS, 128, 12364 (2006)
Physics
Condensed Matter
Superconductivity
Scientific paper
10.1021/JA064778h
High critical-temperature superconductivity and large (colossal) magnetoresistances are two important electronic conducting phenomena found in transition metal oxides. High-Tc materials have applications such as superconducting magnets for MRI and NMR, and magnetoresistive materials may find use in magnetic sensors and spintronic devices. Here we report chemical doping studies of RuSr2(R2-xCex)Cu2O10-d ruthenocuprates which show that a single oxide system can be tuned between superconductivity at high hole dopings and varied magnetoresistive properties at low doping levels. A robust variation of negative magnetoresistance with hole concentration is found in the RuSr2R1.8-xY0.2CexCu2O10-d series, while RuSr2R1.1Ce0.9Cu2O10-d materials show an unprecedented crossover from negative to positive magnetoresistance with rare earth (R) ion radius.
Attfield Paul. J.
Begg Lester L.
Harrow C.
Kimber Simon A. J.
McLaughlin Craig A.
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