Low-Temperature Electronic Heat Transport in La2−xSrxCuO4 Single Crystals: Unusual Low-Energy Physics in the Normal and Superconducting States
J. Takeya, Yoichi Ando, Seiki Komiya, X. F. Sun
DOI 10.1103/PhysRevLett.88.077001 · Physical Review Letters
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Abstract
The thermal conductivity κ is measured in a series of La2−xSrxCuO4 (0≤x≤0.22) single crystals down to 90 mK to elucidate the evolution of the residual electronic thermal conductivity κres, which probes the extended quasiparticle states in the d-wave gap. We found that κres/T grows smoothly, except for a 1/8 anomaly, above x≃0.05, and shows no discontinuity at optimum doping, indicating that the behavior of κres/T is not governed by the metal-insulator crossover in the normal state; as a result, κres/T is much larger than what the normal-state resistivity would suggest in the underdoped region, which highlights the peculiarities in the low-energy physics in the cuprates.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| La2-xSrxCuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 40.5 | 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. | 8 | Pressure not reported | zero_resistance |
| YBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| YBa2Cu4O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| Bi2Sr2CaCu2O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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