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Abstract

Electronic Properties of Hg-1201 Oxide Superconductors Determined by NMR and STM Investigations

Cu nuclear magnetic resonance (NMR) results are presented for several samples of HgBa₂CuO_4+d (Hg-1201). The spin-lattice-relaxation time T1 was measured in a temperature range of 300 K-10 K. For an optimally doped sample (T_c = 96 K) the comparison with numerically calculated values is in coincidence with a d-wave pairing model. The energy gap distribution of Hg-1201 is observed by spatially resolved tunneling spectroscopy using a low temperature scanning tunneling microscope. Two distinct gap values are determined indicating also a non-BCS pairing mechanism.