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- W2017622349 abstract "The reversible mixed state of the Tl2Ba2CuO6+x high Tc superconductor with Tc of 90K has been investigated by DC SQUID measurements of the magnetization M(H, T) and by direct measurement of the AC differential susceptibility χ'H which reduces to the equilibrium dM/dH when, as it is actually the present case in the reversible regime, the flux flow viscous contribution to χ'H could be neglected. The two methods give quite similar results: a strong (field enhanced) contribution from diamagnetic fluctuation above Tc, while below Tc one observes deviation from the Abrikosov mean field theory of the mixed state which is presumably generated by thermal fluctuation enhanced effect on the vortex density and distorsions in the layered structure. This behavior appears to be common to all the high Tc superconductors as we have shown in an earlier work [1, 2, 3] for the YBa2Cu3O7−x, 2223 Tl and 2212 Bi based compounds. Moreover, these deviations prevent any reliable determination of the HC2 critical field line by the standard method of linear extrapolation of M(H, T) curves or by the step anomaly on χ'H expected to occur at Tc(H) if the mean field theory was to be followed in the mixed state." @default.
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- W2017622349 date "1993-05-01" @default.
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- W2017622349 title "Reversibility of the mixed state of the 90K Tl2Ba2CuO6+x superconductor" @default.
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- W2017622349 doi "https://doi.org/10.1016/0925-8388(93)90777-k" @default.
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