Enhancement of superconducting fluctuation under the coexistence of a competing pseudogap state in Bi2Sr2-xRxCuOy

Abstract

The onset temperature of superconducting fluctuation Tonset of Bi2Sr2-xRxCuOy (R=La and Eu) was studied by measuring the Nernst effect. We found that Tonset has a x and R dependence that is quite different from both the pseudogap temperature T* and the critical temperature Tc. Our results support the picture that the incoherent superconductivity, which has been observed below Tonset, is qualitatively different from the pseudogap phenomenon that is characterized by T*. The experimentally obtained phase diagram indicates that the pseudogap state suppresses Tc and enhances superconducting fluctuation while having only small influence on Tonset.

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Cited by in corpus (7)

• Pseudogap temperature $T^{\star }$ of cuprate superconductors from the Nernst effect
• The Valence Transition Model of Pseudogap, Charge-Order and Superconductivity in Electron- and Hole-Doped Copper Oxides
• Three energy scales characterizing the competing pseudogap state, the incoherent, and the coherent superconducting state in high-Tc cuprates
• Equivalent dynamical complexity in a many-body quantum and collective human system
• The conductivity and the magnetization around Tc in optimally-doped YBa${}_2$Cu${}_3$O${}_{7-\delta }$ revisited: quantitative analysis in terms of fluctuating superconducting pairs
• Gap like structure in a nonsuperconducting layered oxycarbonate Bi${}_{2+x}$Sr${}_{4-x}$Cu${}_2$CO${}_3$O${}_{8+\delta }$ single crystal
• Universal limiting transition temperature for the high $T_{\mathrm{c}}$ superconductors