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

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arxiv 1012.3193 v1 pith:XWR7J2NY submitted 2010-12-14 cond-mat.supr-con

Y. Okada , Y. Kuzuya , T. Kawaguchi , H. Ikuta This is my paper · ORCID
classification cond-mat.supr-con
keywords pseudogaptonsetfluctuationsuperconductingtemperaturebi2sr2-xrxcuoydifferentstate
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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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