RESISTIVITY AND HALL MEASUREMENTS ON BI2SR2CUO6 SINGLE-CRYSTALS

Bi2+xSr2-xCuO6 (''2201'') crystals were grown in flowing oxygen from a melt using the CuO self-flux method. The pre-growth ratio Bi/Sr was v aried from 1.00 to 1.17. Resistivity measurements indicate that an ini tial Bi/Sr ratio of 1.025 consistently yields superconducting samples. Post-growth EDX measurements on these superconducting samples taken f rom the top surface of the melt have a resulting Bi/Sr ratio of 1.15. Hall measurements performed in fields to 9 T on superconducting sample s indicate a largely temperature-independent R(H) in the range 2.1-2.3 X 10(-9) m(3)/C, between room temperature and 4 K. Hall angle data do not exhibit the cot(Theta(H)) = AT(2) + B temperature dependence foun d in several other cuprate superconductors. X-ray diffraction patterns and Laue back scattering show the Hall-measured samples to be single- crystal platelets with c-axis normal to the surface and of the superco nducting 2201 structure reported in the literature.