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Published on: March 24, 2019
Total suppression of superconductivity by high magnetic fields in YBa(2)Cu(3)O(6.6)
F Rullier-Albenque1, H Alloul, Cyril Proust
1SPEC, Orme des Merisiers, CEA, 91191 Gif sur Yvette cedex, France. florence.albenque-rullier@cea.fr
Abstract:
We have studied the variation of transverse magnetoresistance of underdoped YBCO(6.6) crystals, either pure or with reduced T(c) down to 3.5 K by electron irradiation, in fields up to 60 T. We find evidence that the superconducting fluctuation contribution to the conductivity is suppressed only above a threshold field H(c)'(T), which is found to vanish at T(c)' > T(c). In the pure YBCO(6.6) sample, H(c)' is already 50 T at T(c). We find that increasing disorder weakly depresses H(c)'(0), T(c)', and T(nu), the onset of the Nernst signal. Thus, these energy scales appear more characteristic of the 2D local pairing than the pseudogap temperature which is not modified by disorder.
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