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Gaussian and Three‐Dimensional‐XY Scalings and Effects of Disorder in the Fluctuation Magnetoconductivity of Polycrystalline DyBa 2 Cu 3 O 7–δ
Author(s) -
RoaRojas J.,
Landínez Téllez D.A.,
Pureur P.
Publication year - 2000
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/1521-3951(200007)220:1<513::aid-pssb513>3.0.co;2-4
Subject(s) - condensed matter physics , mesoscopic physics , gaussian , superconductivity , physics , magnetic field , conductivity , electrical resistivity and conductivity , coherence length , quantum mechanics
Systematic measurements of the fluctuation magnetoconductivity in granular DyBa 2 Cu 3 O 7– δ in magnetic fields up to 50 kOe are reported. Gaussian and critical scalings are observed in the normal state. In the Gaussian regimes, large intervals corresponding to low‐dimensional fluctuations are evidenced. Below T c , in the regime describing the approach to the zero‐resistivity state, the fluctuation conductivity diverges as expected in the coherence transition of mesoscopic granular superconductors in low magnetic fields.