Journal
PHYSICAL REVIEW LETTERS
Volume 87, Issue 19, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.87.197007
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A two-channel scenario for the conductivity of underdoped YBa2Cu3O7-delta is proposed. One is the single-particle excitations channel, which dominates in the optimally doped material, whose resistivity is linear as a function of temperature. The other one gives a contribution which merges the 3D Aslamazov-Larkin fluctuation conductivity at low temperature and obeys a power law at high temperature, depending on two superconductive parameters (T-c and the zero temperature coherence length xi (c0)) and an energy scale Delta*. This allows one to address the nature of the pseudogap in favor of incoherent paining.
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