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

Abstract Normal-state resistance data from Bi 2 Sr 2 CaCu 2 O 8 single crystals were fitted to the (bi)polaronic conduction model, R = R 0 ( T + σ b T 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 assumed 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 ≈ 4 m e .