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

Y. Okada; Y. Kuzuya; T. Kawaguchi; H. Ikuta

doi:10.1103/PhysRevB.81.214520

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

Y. Okada, Y. Kuzuya, T. Kawaguchi, H. Ikuta

DOI 10.1103/PhysRevB.81.214520 · Physical Review B

T1

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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.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Bi2Sr2-xRxCuOy Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
Bi2Sr2CaCu2Oy Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	86	Pressure not reported	unknown