Unusual Superconducting State of Underdoped Cuprates

Journal Article · Thu May 01 04:00:00 EDT 1997 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.78.4111· OSTI ID:509069

Lee, P A; Wen, X ^[1]

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1. Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139 (United States)

There is increasing experimental evidence that the superconducting energy gap {Delta}{sub 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{sub c} is proportional to x{Delta}{sub 0} and part of the gap structure remains in the normal state. We then estimate H{sub c2} and predict it to be proportional to x{sup 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. {copyright} {ital 1997} {ital The American Physical Society}

• OSTI ID: 509069
• Journal Information: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 21 Vol. 78; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
CRYSTAL DOPING
CUPRATES
ENERGY GAP
FLUCTUATIONS
HIGH-TC SUPERCONDUCTORS
PENETRATION DEPTH
TRANSITION TEMPERATURE