The Unusual Superconducting State of Underdoped Cuprates

Details The Unusual Superconducting State of Underdoped Cuprates The Unusual Superconducting State of Underdoped Cuprates

1997-02-12

arxiv.org/abs/cond-mat/9702119v1

Phys. Rev. Lett., 78, 4111 (1997)

Physics

Condensed Matter

Superconductivity

4 pages RevTeX

Scientific paper

10.1103/PhysRevLett.78.4111

There is increasing experimental evidence that the superconducting energy gap $\Delta_0$ 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 $T_c$ is proportional to $x\Delta_0$ and part of the gap structure remains in the normal state. We then estimate $H_{c2}$ and predict it to be proportional to $x^2$. 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.

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