Critical Point and the Nature of the Pseudogap of Single-Layered Copper-Oxide Bi2Sr2−xLaxCuO6+δ Superconductors
Guo-qing Zheng, P. L. Kuhns, A. P. Reyes, B. Liang, C. T. Lin
DOI 10.1103/PhysRevLett.94.047006 · Physical Review Letters
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Abstract
We apply strong magnetic fields of H=28.5 to 43 T to suppress superconductivity (SC) in the cuprates Bi2Sr2−xLaxCuO6+δ (x=0.65, 0.40, 0.25, 0.15, and 0), and investigate the low temperature (T) normal state by Cu63 nuclear spin-lattice relaxation rate (1/T1) measurements. We find that the pseudogap (PG) phase persists deep inside the overdoped region but terminates at x∼0.05, which corresponds to the hole doping concentration of approximately 0.21. Beyond this critical point, the normal state is a Fermi liquid that persists as the ground state when superconductivity is removed by the magnetic field. A comparison of the superconducting state with the H-induced normal state in the x=0.40 (Tc=32 K) sample indicates that there remains substantial part of the Fermi surface even in the fully developed PG state, which suggests that the PG and SC are coexisting matters.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Bi2Sr2-xLaxCuO6+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 32 | Pressure not reported | zero_resistance |
| Bi2Sr2CuO6.36 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 8 | Pressure not reported | zero_resistance |
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