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- W2963081663 abstract "Pairs fluctuation supercurrents and inverse lifetimes were measured on epitaxial c-axis junctions of the cuprates in the pseudogap regime, with a $PrBa_2Cu_3O_{7-delta}$ barrier sandwiched in between two $YBa_2Cu_3O_{7-delta}$ or doped $YBa_2Cu_3O_y$ electrodes, with or without magnetic fields parallel to the a-b planes. All junctions had a $rm T_c(high)approx 85-90$ K and a $rm T_c(low)approx 50-55$ K electrodes, allowing us to study pairs fluctuation supercurrents and inverse life times in between these two temperatures. In junctions with a pseudogap electrode under zero field, an excesss current due to pair fluctuations was observed which persisted at temperatures above $rm T_c(low)$, in the pseudogap regime, and up to about $rm T_c(high)$. No such excess current was observed in junctions without a pseudo-gap in the electrode. The measured conductance spectra at temperatures above $rm T_c(low)$ were fitted using a modified fluctuations model by Scalapino [Phys. Rev. Lett. textbf{24}, 1052(1970)] of a junction with a serial resistance. We found that in the pseudo-gap regime, the conductance vs voltage consists of a narrow peak sitting on top of a very broad peak. This yielded two distinct pairs fluctuation lifetimes in the pseudogap electrode which differ by an order of magnitude up to about $rm T_c(high)$. Under in-plane fields, these two lifetime values remain separated in two distinct groups, which varied with increasing field moderately. We also found that detection of Amperian pairing [Phys. Rev. X textbf{4}, 031017 (2014)] in our cuprate junctions is not feasible, due to Josephson vortices penetration into the superconducting electrodes which drove the necessary field above the depairing field." @default.
- W2963081663 created "2019-07-30" @default.
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- W2963081663 date "2016-11-01" @default.
- W2963081663 modified "2023-09-23" @default.
- W2963081663 title "Observation of two distinct pairs fluctuation lifetimes and supercurrents in the pseudogap regime of cuprate junctions" @default.
- W2963081663 hasPublicationYear "2016" @default.
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