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Physical Review Letters
Volumn 69, Issue 13, 1992, Pages 2001-2004
Pairing and spin gap in the normal state of short coherence length superconductors
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Indexed keywords

EID: 0042703101     PISSN: 00319007     EISSN: None     Source Type: Journal    
DOI: 10.1103/PhysRevLett.69.2001     Document Type: Article
Times cited : (363)
References (29)
  • 5
    • 84927847082 scopus 로고    scopus 로고
    • The difficulty is that one is dealing with the intermediate coupling regime of a finite temperature, nonperturbative, many-body problem. See J. R. Engelbrecht, M. Randeria, and C. Sa de Melo (unpublished).
  • 17
    • 84927847081 scopus 로고    scopus 로고
    • We always choose < n > != 1, since we are not interested in the competition between superconductivity and CDW's at half filling.
  • 21
    • 84927847080 scopus 로고    scopus 로고
    • We have also directly ascertained this from the momentum distribution < nk> . For U = 12, < nk=0> apeq 0.65 at T = 0.1, which should be compared with the value 1/2 < n > = 0.25 expected for U -> inf.
  • 22
    • 84927847079 scopus 로고    scopus 로고
    • At T = 0 the chemical potential goes below the bottom of the band for U > 8 / ( 1 - < n > ), which is obtained from (2) using μ apeq - 1/2 U for U >> 1. In the superconducting case, the dependence of the energy gap on the order parameter changes qualitatively at this point; see Refs. [1,2,12].
  • 23
    • 84927847078 scopus 로고    scopus 로고
    • In 2D where Tc is much lower than Tc0, it is interesting to ask if deviations from Fermi-liquid behavior persist even as U -> 0. Finite-size errors, which are more pronounced at small U, make if difficult to address this question via Monte Carlo calculations.
  • 24
    • 84927847077 scopus 로고    scopus 로고
    • In the large-U limit the attractive Hubbard model can be mapped onto a hard-core Bose system with effective hopping t2/ U. See Ref. [10].
  • 25
    • 84927847076 scopus 로고    scopus 로고
    • The 2D S = 1/2 Heisenberg antiferromagnet provides a counterexample. d χ / d T > 0 for T < J, but 1 / T1T increases with decreasing T.
  • 28
    • 84927847075 scopus 로고    scopus 로고
    • For a discussion of spin-gap behavior within resonating-valence-band theory, see T. M. Rice, in The Physics and Chemistry of Oxide Superconductors, edited by Y. Iye and H. Yasuoaka (Springer, Berlin, 1992); H. Fukuyama et al. (to be published).

* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.