Physics – Condensed Matter – Superconductivity
Scientific paper
2004-06-30
Physics
Condensed Matter
Superconductivity
4 pages, 4 figures; author list revised
Scientific paper
10.1103/PhysRevLett.93.267002
The evolution of Ca$_{2-x}$Na$_{x}$CuO$_{2}$Cl$_{2}$ from Mott insulator to superconductor was studied using angle-resolved photoemission spectroscopy. By measuring both the excitations near the Fermi energy as well as non-bonding states, we tracked the doping dependence of the electronic structure and the chemical potential with unprecedented precision. Our work reveals failures in the conventional quasiparticle theory, including the broad lineshapes of the insulator and the apparently paradoxical shift of the chemical potential within the Mott gap. To resolve this, we develop a model where the quasiparticle is vanishingly small at half filling and grows upon doping, allowing us to unify properties such as the dispersion and Fermi wavevector with the behavior of the chemical potential.
Armitage Peter N.
Azuma Masaki
Baumberger F.
Damascelli Andrea
Ingle N. J. C.
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