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We report 63Cu-NMR/NQR studies on Hg-based four-layered compounds HgBa2Ca3Cu4 O8+y (Hg-1234) with Tc=123, 110, and 95K. The 63Cu Knight shift measurements have revealed that the carrier density (Nh) monotonously decreases with decreasing Tc. Although static magnetic order was not observed at Nh=0.15 for the IP with Tc=95K, it was revealed that antiferromagnetic correlations critically develop, preventing...
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