Normal-state magnetic susceptibility in a bilayer cuprate
W. C. Wu, B. W. Statt, Ya-Wei Hsueh, and J. P. Carbotte
TL;DR
This paper investigates the magnetic susceptibility of high-T_c cuprates in the normal state using a bilayer model, revealing different mechanisms for optical and magnetic pseudogaps.
Contribution
It introduces a bilayer model that explains the c-axis optical pseudogap but shows limitations in accounting for magnetic pseudogaps in NMR data.
Findings
Weakly increasing susceptibility with decreasing temperature
Model explains optical pseudogaps but not magnetic pseudogaps
Suggests different mechanisms for optical and magnetic pseudogaps
Abstract
The magnetic susceptibility of high-T_c superconductors is investigated in the normal state using a coupled bilayer model. While this model describes in a natural way the normal-state pseudogaps seen in c-axis optical conductivity on underdoped samples, it predicts a weakly increasing susceptibility with decreasing temperature and cannot explain the magnetic pseudogaps exhibited in NMR measurements. Our result, together with some experimental evidence suggest that the mechanism governing the c-axis optical pseudogap is different from that for the plane magnetic pseudogap.
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