Onset of a Boson Mode at the Superconducting Critical Point of Underdoped YBa2Cu3Oy
Nicolas Doiron-Leyraud, Mike Sutherland, S. Y. Li, Louis Taillefer, Ruixing Liang, D. A. Bonn, W. N. Hardy
DOI 10.1103/PhysRevLett.97.207001 · Physical Review Letters
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Abstract
The thermal conductivity κ of underdoped YBa2Cu3Oy was measured in the T→0 limit as a function of hole concentration p across the superconducting critical point at pSC≡5.0%. The evolution of bosonic and fermionic contributions to κ was tracked as the doping level evolved continuously in each of our samples. For p≤pSC, we observe a T3 component in κ which we attribute to the boson excitations of a phase with long-range spin or charge order. Fermionic transport, observed as a T-linear term in κ which persists unaltered through pSC, violates the Wiedemann-Franz law, since the electrical resistivity varies as log(1/T) and grows with decreasing p.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| YBa2Cu3Oy 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 |
| YBa2Cu3Oy Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 6 | Pressure not reported | zero_resistance |
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