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Microwave absorption measurements in magnetic fields from zero up to 16 Twere used to determine the temperature range of superconducting fluctuationsabove the superconducting critical temperature T_c in YBa_2Cu_3O_{7-\delta}.Measurements were performed on deeply underdoped, slightly underdoped, andoverdoped single crystals. The temperature range of the superconductingfluctuations above T_c is determined by an experimental method which is freefrom arbitrary assumptions about subtracting the nonsuperconductingcontributions to the total measured signal, and/or theoretical models toextract the unknown parameters. The superconducting fluctuations are detectedin the ab-plane, and c-axis conductivity, by identifying the onset temperatureT'. Within the sensitivity of the method, this fluctuation regime is found onlywithin a fairly narrow region above T_c. Its width increases from 7 K in theoverdoped sample (T_c = 89 K), to at most 23 K in the deeply underdoped sample(T_c = 57 K), so that T' falls well below the pseudogap temperature T*.Implications of these findings are discussed in the context of otherexperimental probes of superconducting fluctuations in the cuprates.

Temperature range of superconducting fluctuations above T_c in YBa_2Cu_3O_{7-\delta} single crystals