AG Lüders
Abstract
Hg-BASED CUPRATES: MAGNETIC PROPERTIES, NMR AND NQR INVESTIGATIONS
The effect of excess oxygen on the superconducting properties of
HgBa2CuO4+d is studied.
Ac and dc magnetization measurements on well defined samples
(d » 0.01 - 0.14) are performed. Analyzing
the magnetization curves at T=5 K in different field regimes displays that
TC, Bc1, the penetration depths and the absolute magnitude
of the magnetization depend strongly on the oxygen content
d. The maximum value of TC=96 K corresponds
to d=0.08(1) which is equal to an average copper valence of v[Cu]=2.16. This
value is significant for the in-plane Cu valence of optimally doped cuprates.
Furthermore NMR and NQR techniques are applied on the Hg 1201 system.