Crystalline instability of Bi-2212 superconducting whiskers near room temperature |
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Authors: | Stefano Cagliero Angelo Agostino Mohammad Mizanur Rahman Khan Marco Truccato Francesco Orsini Massimo Marinone Giulio Poletti and Alessandro Lascialfari |
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Institution: | (1) “Giovanni Esposito” Institute of General Physiology and Biological Chemistry, University of Milan, Via Trentacoste 2, 20134 Milan, Italy |
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Abstract: | We report new evidences for the thermodynamic instability of whisker crystals in the Bi–Sr–Ca–Cu–O (BSCCO) system. Annealing
treatments at 90°C have been performed on two sets of samples, which were monitored by means of X-Rays Diffraction (XRD) and
Atomic Force Microscopy (AFM) measurements, respectively. Two main crystalline domains of Bi2Sr2CuCa2O8+x
(Bi-2212) were identified in the samples by the XRD data, which underwent an evident crystalline segregation after about
60 hours. Very fast dynamics of the surface modifications was also described by the AFM monitoring. Two typologies of surface
structures formed after about 3 annealing hours: continuous arrays of dome shaped bodies were observed along the edges of
the whiskers, while in the central regions a dense texture of flat bodies was found. These modifications are described in
terms of the formation of simple oxide clusters involving a degradation of the internal layers. |
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Keywords: | PACS" target="_blank">PACS 68 70 +w 74 72 Hs 74 62 Bf 61 05 Cp 68 37 Ps |
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