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Pseudogap and Precursor Superconductivity Study of Zn doped YBCO (Hardcover, 2015 ed.)
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Pseudogap and Precursor Superconductivity Study of Zn doped YBCO (Hardcover, 2015 ed.)
Series: Springer Theses
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In this thesis, the pseudogap and the precursor superconducting
state, which are of great importance in clarifying the
superconductivity mechanism in high-temperature cuprate
superconductors, are investigated with a c-axis optical study in
YBa2(Cu1-xZnx)3Oy. Testing was performed over a wide energy range
with smaller temperature intervals for several Zn-substituted
samples, as well as for several carrier-doping levels. A spectral
weight (SW) analysis, in which the pseudogap behavior can be
separated from the superconducting condensate with the SW transfer
to the high-energy region, revealed that the pseudogap is not the
precursor of the superconductivity (carriers moving to the
high-energy region with pseudogap opening never contribute to the
superconducting condensation). Moreover, the high-energy transfer
continues even below Tc for the Zn-substituted samples (in which we
weaken the superconductivity), which gives evidence to the
coexistence of the pseudogap and the superconducting gap below Tc.
On the other hand, the analysis of optical conductivity revealed
that a precursor state to superconductivity can be defined at
temperatures much higher than Tc. The superconducting carrier
density (ns) was calculated for each temperature (above and below
Tc) and the results confirmed the existence of ns at temperatures
above Tc. The observed real superconducting condensate (ns) above
Tc puts a serious constraint on the theory for high- Tc
superconductivity. A theory based on an inhomogeneous
superconducting state, in which a microscopically phase-separated
state in a doped Mott insulator can be observed, is the most
plausible candidate. This theory can explain the existence of ns
and the observed temperature range for the precursor
superconducting state. The results obtained show that the pseudogap
coexists with superconductivity below Tc and is not the precursor
of superconductivity. On the other hand, it is also possible to
define a precursor superconducting state that is different than the
pseudogap. The temperature range and the observed superconducting
condensate in this state can be explained with the help of the
inhomogeneous superconducting state.
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