We report the observation of a phase transformation which can occur in a microscopic double phase BSCCO whisker at room temperature. We performed electrical resistivity measurements by thermally cycling the whisker in the range 78–300 K in a helium atmosphere and observed a decrease of the Bi-2223 phase amount in favour of the Bi-2212 phase, accompanied by an increase in the Tc of the Bi-2212 phase. A longer ageing of the whisker increased its resistance by about a factor of four at room temperature and caused a semiconducting behaviour at low temperature. We demonstrate that a simple electrical model can account for the experimental data and disentangle the contributions of the two phases.

Electrical study of an unusual phase transformation in a Bi2Sr2Ca2Cu3O10+x whisker at room temperature

TRUCCATO, Marco;CAGLIERO, Stefano;AGOSTINO, Angelo;RINAUDO, Giuseppina
2006

Abstract

We report the observation of a phase transformation which can occur in a microscopic double phase BSCCO whisker at room temperature. We performed electrical resistivity measurements by thermally cycling the whisker in the range 78–300 K in a helium atmosphere and observed a decrease of the Bi-2223 phase amount in favour of the Bi-2212 phase, accompanied by an increase in the Tc of the Bi-2212 phase. A longer ageing of the whisker increased its resistance by about a factor of four at room temperature and caused a semiconducting behaviour at low temperature. We demonstrate that a simple electrical model can account for the experimental data and disentangle the contributions of the two phases.
19 (10)
1003
1009
whisker; BSCCO; Bi-2212; Bi-2223; oxygen; ageing; phase transformation
TRUCCATO M; CAGLIERO S; AGOSTINO A; PANETTA M; RINAUDO G
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/2318/9961
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