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- W2952904085 abstract "High resolution magnetization measurements of Ba(Fe$_{1-x}$Rh$_x$)$_2$As$_2$ iron-based superconductors, over a broad range of doping (0.041<x<0.094), are presented and discussed. The occurrence of precursor diamagnetism, not ascribable to the conventional Ginzburg-Landau theory, has been detected by SQUID magnetometry, when the field H is smaller than 4000 Oe. The magnetization curves have been fit by a model which assumes the formation of precursor islands, where the amplitude of the order parameter is frozen, while the long-range coherence is prevented by strong fluctuations of the phase. Such model has proven to be successful to interpret the precursor diamagnetism found in high-Tc and 1111 iron-based superconductors. On the other hand, when stronger fields are applied, the unconventional fluctuating diamagnetism is suppressed, the Ginzburg-Landau scenario is restored, and the experimental findings agree with the 3D XY universality class. Moreover, the appearance of history-dependent phenomena, above the critical temperature, is consistent with the presence of vortices. These observations show that anomalous superconducting fluctuations are present across the whole phase diagram, also close to the optimally doped compound." @default.
- W2952904085 created "2019-06-27" @default.
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- W2952904085 date "2013-11-06" @default.
- W2952904085 modified "2023-10-17" @default.
- W2952904085 title "Non-conventional superconducting fluctuations in Ba(Fe$_{1-x}$Rh$_x$)$_2$As$_2$ iron-based supercondutors" @default.
- W2952904085 hasPublicationYear "2013" @default.
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