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We have re-examined the temperature-doping (T-p) phase diagram of YBa2Cu3Oy(YBCO) to address several issues therein by using the temperature derivative ofin-plane resistivity, d\{rho}ab/dT. For p less than about 0.15, a temperatureTf has been defined to mark the onset of an upturn in d\{rho}ab/dT at T>Tc,which, in light of prior studies on another cuprate La2-xSrxCuO4, is attributedto the onset of superconducting fluctuations in normal state. The Tf exhibits adoping dependence similar to Tc, and the interval between Tf and Tc is about5-30 K across the underdoped regime, showing agreement with a variety of othermeasurements to probe a restricted temperature range of superconductingfluctuations. Above Tf, the d\{rho}ab/dT increases linearly as T increases upto a value denoted as T2, which is about half the T* and falls roughly inparallel with T* as p rises up to about 0.13, indicating a prominentT^2-dependent \{rho}ab in this T-p region. The d\{rho}ab/dT helps reveal that,at Tf<T<T2, the \{rho}ab also involves an insulating-like component for p<0.08,or a T-linear component for p>0.10-0.11, thereby leaving a narrow window ofdoping for \{rho}ab to show a pure T^2 dependence. As T increases further, thed\{rho}ab/dT reaches a local maximum at a temperature T_R, signifying the knowncurvature change (inflection point) in \{rho}ab. With the derivatives, it isillustrated that, in the vicinity of T_R, the in-plane Hall coefficient R_H andthermopower Sab of YBCO display curvature changes as well, suggesting acorrelation of the three transport properties. It is also found that thedSab/dT shows the onset of an upturn at a temperature coinciding with the Tf,which, backing the identification of Tf with the onset of superconductingfluctuations, demonstrates further the virtue of using the temperaturederivative to unveil information helpful for the study of high-Tc cuprates.

Revisiting the electronic phase diagram of YBa2Cu3Oy via temperature derivative of in-plane resistivity