Abstract
The magnetoresistance, Hall effect and Nernst effect of slightly overdoped Bi 2Sr 2CaCu 2O 8+ δ single crystals were measured for both normal state and mixed state. The superconducting transition temperature ( T c0) and the pseudogap opening temperature ( T*) determined from the temperature dependence of resistivity are 86.5 K and 120 K respectively, while the onset temperature ( T O) of vortex-like excitation detected by Nernst effect is about 105 K, which is consistent with the onset temperature of superconducting fluctuation determined from magnetoresistance and Hall coefficient measurement. This result indicates that both pseudogap opening and superconducting fluctuation exist above T c in the slightly overdoped region of electronic phase diagram of cuprates. In contrast to the underdoped case, the narrower temperature range of superconducting fluctuation in the slightly overdoped region could be understood by the Ginzburg–Landau fluctuation theory.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
