A ‘checkerboard’ electronic crystal state in lightly hole-doped Ca2-xNaxCuO2Cl2
نویسندگان
چکیده
منابع مشابه
ARPES study on electronic evolution in Ca2 xNaxCuO2Cl2
Electronic evolution from an antiferromagnetic insulator to a high-Tc superconductor is revealed by angle-resolved photoemission spectroscopy experiments on tetragonal Ca2 xNaxCuO2Cl2 single crystals, which were grown for the first time under high pressures (6 5.5 GPa). In an underdoped superconductor (x 1⁄4 0:1), we found clear fingerprints of the parent magnetic insulator: a shadow band and a...
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Sr3(Ru(1-x)Mnx)2O7, in which 4d-Ru is substituted by the more localized 3d-Mn, is studied by x-ray dichroism and spin-resolved density functional theory. We find that Mn impurities do not exhibit the same 4+ valence of Ru, but act as 3+ acceptors; the extra eg electron occupies the in-plane 3d(x2-y2) orbital instead of the expected out-of-plane 3d(3z2-r2). We propose that the 3d-4d interplay, v...
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We performed high-resolution scanning tunneling microscopy/spectroscopy on an optimally-doped Ca2 xNaxCuO2Cl2 crystal with Tc 25 K. The so-called ‘‘checkerboard’’ local-density-of-state modulation previously found in heavily underdoped regime also manifests in the spectroscopic map of the optimally-doped sample. In addition, spatially-inhomogeneous energy gap with peaks at the gap edges is obse...
متن کاملVisualization of the emergence of the pseudogap state and the evolution to superconductivity in a lightly hole-doped Mott insulator
Superconductivity emerges from the cuprate antiferromagnetic Mott state with hole doping. The resulting electronic structure1 is not understood, although changes in the state of oxygen atoms seem paramount2–5. Hole doping first destroys the Mott state, yielding a weak insulator6,7 where electrons localize only at low temperatures without a full energy gap. At higher doping levels, the ‘pseudoga...
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ژورنال
عنوان ژورنال: Nature
سال: 2004
ISSN: 0028-0836,1476-4687
DOI: 10.1038/nature02861