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Resistivity, fluctuation‐enhanced conductivity, and irreversibility line of high‐quality Tl 2 Ba 2 Ca 2 Cu 3 O 10 single crystals
Author(s) -
Winzer K.,
Kumm G.,
Maaß P.,
Thomas H.,
Schwarzmann E.,
Aghaie A.,
Ladenberger F.
Publication year - 1992
Publication title -
annalen der physik
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.009
H-Index - 68
eISSN - 1521-3889
pISSN - 0003-3804
DOI - 10.1002/andp.19925040702
Subject(s) - electrical resistivity and conductivity , anisotropy , condensed matter physics , materials science , conductivity , coherence length , diffusion , flux (metallurgy) , line (geometry) , atmospheric temperature range , flux method , magnetic field , tensor (intrinsic definition) , physics , single crystal , nuclear magnetic resonance , optics , superconductivity , thermodynamics , geometry , mathematics , quantum mechanics , metallurgy , pure mathematics
We present measurements of the resistivity tensor components ρ a ( T ) and ρ c ( T ) of high‐quality Tl 2 Ba 2 Ca 2 Cu 3 O 10 single crystals wit T c = 118 … 121 K. The in‐plane resistivity ρ a as well as the out‐of‐plane resistivity ρ c show a metal‐like temperature dependence with an anisotropy ratio ρ c /ρ a of up to 10 3 . The coherence length ξ c (0) = 0.15 nm could be determined from an analysis of the fluctuation conductivity above T c . From measurements of the ac‐susceptibility in magnetic fields up to 10 Tesla the temperature dependence of the depinning line could be obtained. The diffusion coefficient of the flux lines obtained from the frequency dependence of the depinning temperature shows a thermally activated behaviour of the flux motion in the field range 0.1 T ⩽ B ⩽ 10 T .