Journal
JOURNAL OF SUPERCONDUCTIVITY AND NOVEL MAGNETISM
Volume 22, Issue 2, Pages 179-183Publisher
SPRINGER
DOI: 10.1007/s10948-008-0376-2
Keywords
Nuclear magnetic resonance; High-temperature superconductivity; Hole doping
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Cu-63 Nuclear Magnetic Resonance (NMR) measurements on a single crystal of the single-layer high-temperature superconductor HgBa2CuO4+delta are reported. From the analysis of the quadrupolar satellites and their anisotropic splitting a largely temperature-independent symmetric quadrupole tensor is deduced, despite substantial variation in the electrical field gradients at the Cu site. The strongly temperature-dependent magnetic shifts and linewidths of the Cu-63 central line for different field orientations also reveal substantial spin shift variations in the material. Linear dependences on the doping of both, the quadruple splitting as well as the spin shifts, explain over a large temperature range all the widths with a local doping variation corresponding to 2 delta a parts per thousand 0.073.
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