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Sutherland M, Li SY, Hawthorn DG, et al. Delocalized fermions in underdoped cuprate superconductors. Phys Rev Lett. 2005;94(14):147004doi: 10.1103/PhysRevLett.94.147004.
Sutherland, M., Li, S. Y., Hawthorn, D. G., Hill, R. W., Ronning, F., Tanatar, M. A., Paglione, J., Zhang, H., Taillefer, L., DeBenedictis, J., Liang, R., Bonn, D. A., & Hardy, W. N. (2005). Delocalized fermions in underdoped cuprate superconductors. Physical review letters, 94(14), 147004. https://doi.org/10.1103/PhysRevLett.94.147004
Sutherland, Mike, et al. "Delocalized fermions in underdoped cuprate superconductors." Physical review letters vol. 94,14 (2005): 147004. doi: https://doi.org/10.1103/PhysRevLett.94.147004
Sutherland M, Li SY, Hawthorn DG, Hill RW, Ronning F, Tanatar MA, Paglione J, Zhang H, Taillefer L, DeBenedictis J, Liang R, Bonn DA, Hardy WN. Delocalized fermions in underdoped cuprate superconductors. Phys Rev Lett. 2005 Apr 15;94(14):147004. doi: 10.1103/PhysRevLett.94.147004. Epub 2005 Apr 14. PMID: 15904097.
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Phys Rev Lett. 2005 Apr 15;94(14):147004. doi: 10.1103/PhysRevLett.94.147004. Epub 2005 Apr 14.

Delocalized fermions in underdoped cuprate superconductors.

Physical review letters

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

Affiliations

  1. Department of Physics, University of Toronto, Toronto, Ontario, Canada.

PMID: 15904097 DOI: 10.1103/PhysRevLett.94.147004

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 with doping concentrations on either side of the superconducting phase boundary. We report the observation of delocalized fermionic excitations at zero energy in the nonsuperconducting state, which shows that the ground state of underdoped cuprates is a thermal metal. 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.

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