Experimental fitting to the bipolaronic model of the normal-state resistance of Bi2Sr2CaCu2O8 single crystals

Normal-state resistance data from Bi2Sr2CaCu2O8 single crystals were fitted to the (bi)polaronic conduction model, R = R-0(T + sigma T-b(2))/(1 + bT), with satisfactory agreement over a wide temperature range. The fluctuating conduction region is found to be much narrower than what is generally assu med in high-T-c cuprates. This behavior agrees with the case for a charged Bose-gas. We estimate the effective (bi)polaron mass to be similar to 4m(e) .