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Phenomenology and Sign Change of the Hall Resistivity near the Superconducting Transition 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<509::aid-pssb509>3.0.co;2-l
Subject(s) - condensed matter physics , electrical resistivity and conductivity , hall effect , superconductivity , sign (mathematics) , thermal hall effect , physics , quantum hall effect , materials science , quantum mechanics , electron , mathematics , mathematical analysis
Measurements of the temperature dependence of the electrical resistivity and the Hall effect in the normal and superconducting states of a ceramic DyBa 2 Cu 3 O 7– δ superconductor are reported. In high temperatures the diagonal resistivity is proportional to T , whereas the Hall response exhibits a 1/ T dependence and the cotangent of the Hall angle is proportional to T 2 . Upon decreasing the temperature, the Hall response shows a sign reversal close to T c , goes through a negative maximum and vanishes close to the so‐called zero‐resistance temperature. The aim of this report is to show that the sign change occurs in the temperature region dominated by thermal fluctuations in the order parameter.