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Abstract

NMR study of spin dynamics related to different oxygen content in HgBa₂CuO_4+d

Still the highest transition temperatures T_c in superconductors were observed in the recently discovered Hg-based cuprates with the general formula HgBa₂Ca_n-1Cu_nO_2n+2+d. These compounds exhibit a tetragonal structure similar to the Tl and Bi cuprates. In order to study the influence of oxygen doping on the structure and the superconducting properties we present ^63,65Cu and ¹⁹⁹Hg Nuclear Magnetic Resonance (NMR) results on several samples of HgBa₂CuO_4+d (Hg-1201).