Abstract
Polycrystalline samples of Ba2Ca3Cu4O8(O1−yFy)2 (0234F) with a variety of Tc (55–105 K) were synthesized under high pressure. The dynamic range of the Tc 50 K in an underdoped region, has been found to be remarkably wide. We also found that plate-like single crystals of 0234F (∼1 mm2 in plane area and 30 μm in thickness) grow when samples with a nominal composition of y∼1.0 are heated at high temperature (∼1150 °C). Cleavage was observed for the crystals. The 0234F will be a convenient material for investigations of physics of the multi-layered superconductors and/or the underdoped state that has a key for understanding high-Tc superconductivity.
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