Delocalized fermions in underdoped cuprates
Mike Sutherland, S. Y. Li, D. G. Hawthorn, R. W. Hill, F. Ronning, M. A. Tanatar, J. Paglione, H. Zhang, Louis Taillefer, J. DeBenedictis, Ruixing Liang, D. A. Bonn, W. N. Hardy
Abstract
Low temperature heat transport was used to investigate the ground state of high-purity single crystals of the lightly-doped cuprate YBa2Cu3O6.33. Samples were measured on either side of the superconducting phase boundary, in both zero and applied magnetic field. We report the observation of delocalized fermionic excitations at zero energy in the non-superconducting state, which shows that the ground state of underdoped cuprates is metallic. Its low-energy spectrum appears to be similar to that of the d-wave superconductor, i.e. nodal. The insulating ground state observed in underdoped La2-xSrxCuO4 is attributed to the competing spin-density-wave order present in that system.
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