Two-component uniform spin susceptibility in superconducting HgBa$_{2}$CuO$_{4+δ}$ single crystals determined with $^{63}$Cu and $^{199}$Hg NMR

Details Two-component uniform spin susceptibility in superconducting HgBa$_{2}$CuO$_{4+δ}$ single crystals determined with $^{63}$Cu and $^{199}$Hg NMR Two-component uniform spin susceptibility in superconducting HgBa$_{2}$CuO$_{4+δ}$ single crystals determined with $^{63}$Cu and $^{199}$Hg NMR

2011-10-27

arxiv.org/abs/1110.6016v2

Physics

Condensed Matter

Superconductivity

Scientific paper

$^{63}$Cu and $^{199}$Hg NMR shifts for an optimally and underdoped HgBa$_{2}$CuO$_{4+\delta}$ single crystal are reported, and the temperature dependence dictates a two-component description of the uniform spin susceptibility. The first component, associated with the pseudogap phenomenon in the NMR shifts, decreases already at room temperature and continues to drop as the temperature is lowered, without a drastic change at the transition temperature into the superconducting state. The second component is temperature independent above the superconducting transition temperature and vanishes rapidly below it. It increases with doping and is a substantial part of the total spin susceptibility measured at both nuclei.

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