Abstract
The systematic evolution of the temperature-dependent resistivity R(T) in La 2−¢Sr ¢CuO 4 has been succesfully described over a wide temperature and composition range. Two important assumptions have been used to achieve a good quantitative fit of the R(T) curves: (i) the conductivity σ of the layered high T c cuprates is dominated by the universal two-dimensional quantum conductivity σ 2 D ≌ 4 e 2/ h x ln( Lø/ l) and (ii) the inelastic length Lø is given by the magnetic correlation length Lø ≌ ξ ≌ exp( J/T) of the two-dimensional quantum Heisenberg antiferromagnet. The enigmatic T-linear in-phase resistivity R( T) is then explained as a result of the mutual cancellation of the two inverse functions ( ln and exp), which leads to a linear R vs T dependence with the slope being inversely proportional to the exchange coupling J.
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