3 years ago

Percolative nature of the dc paraconductivity in the cuprate superconductors.

Vikram Nagarajan, Kristijan Velebit, Yang Tang, Damjan Pelc, Martin Greven, Neven Barišić, Zachary Anderson, Petar Popčević, Guichuan Yu, Miroslav Požek

We present an investigation of the planar direct-current (dc) paraconductivity of the model cuprate material HgBa$_2$CuO$_{4+\delta}$ in the underdoped part of the phase diagram. The simple quadratic temperature-dependence of the Fermi-liquid normal-state resistivity enables us to extract the paraconductivity above the macroscopic $T_c$ with great accuracy. The paraconductivity exhibits unusual exponential temperature dependence, with a characteristic temperature scale that is distinct from $T_c$. In the entire temperature range where it is discernable, the paraconductivity is quantitatively explained by a simple superconducting percolation model, which implies that underlying gap disorder dominates the emergence of superconductivity.

Publisher URL: http://arxiv.org/abs/1710.10220

DOI: arXiv:1710.10220v1

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