Delocalized Fermions in Underdoped Cuprate Superconductors
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
DOI 10.1103/PhysRevLett.94.147004 · Physical Review Letters
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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.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| YBa2Cu3O6.33 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 0.1 | Pressure not reported | zero_resistance |
| YBa2Cu3O6.33 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 6 | Pressure not reported | zero_resistance |
| La2-xSrxCuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 5 | Pressure not reported | unknown |
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