Unusual Superconducting State of Underdoped Cuprates
Patrick A. Lee, Xiao-Gang Wen
DOI 10.1103/PhysRevLett.78.4111 · Physical Review Letters
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Abstract
There is increasing experimental evidence that the superconducting energy gap Δ0 in the underdoped cuprates is independent of doping concentration x while the superfluid density is linear in x. We show that under these conditions thermal excitation of the quasiparticles is very effective in destroying the superconducting state, so that Tc is proportional to xΔ0 and part of the gap structure remains in the normal state. We then estimate Hc2 and predict it to be proportional to x2. We also discuss to what extent the assumptions that go into the quasiparticle description can be derived in the U(1) and SU(2) formulations of the t−J model.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| YBa2Cu3O6.95 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| YBa2Cu3O6.60 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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