Substitution of Y for Ca in Bi2Sr2CaCu2O8+δ (Bi-2212) system is known to effectively change the hole carrier density. In this paper, we report the growth and characterization of Y-substituted Bi-2212 whisker crystals. The evaluated Y content in the whiskers increased as we increased the nominal Y-ratio in the Bi-Sr-Ca-Y-Cu-Te precursor. The X-ray diffraction patterns of whiskers aligned on a glass plate only showed (00l) Bragg peaks of Bi-2212 phase, indicating that the grown whiskers are single crystalline. The c-axis lattice parameter showed monotonic decrease with Y-substitution. The resistivity of Y-substituted whiskers showed systematic decrease of superconducting transition temperature and increase of normal resistivity, suggesting that the hole carrier density was controlled via Y-substitution. Based on these results, we propose that Bi-2212 with various carrier concentrations can be easily obtained by growing Y-substituted whiskers. Furthermore, such whiskers with controlled T
c might be useful for microelectronic applications such as terahertz oscillator.
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