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Physical Review B - Condensed Matter and Materials Physics
Volumn 79, Issue 18, 2009, Pages
Coexistence of two order parameters and a pseudogaplike feature in the iron-based superconductor LaFeAsO1-x Fx
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EID: 67649412017     PISSN: 10980121     EISSN: 1550235X     Source Type: Journal    
DOI: 10.1103/PhysRevB.79.184526     Document Type: Article
Times cited : (63)
References (45)
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    • (2003) The Physics of Superconductors
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    • 10.1103/PhysRevLett.100.237003
    • D. J. Singh and M.-H. Du, Phys. Rev. Lett. 100, 237003 (2008). 10.1103/PhysRevLett.100.237003
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    • Singh, D.J.1    Du, M.-H.2
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    • As a matter of fact, the polycrystal nature of the sample prevents us from controlling the direction of current injection in the crystallites and, if the gap had d -wave symmetry, small deviations from the antinodal directions (even of an angle as small as π/12) would lead to the appearance of the zero-bias peak. This is more true if one takes into account that, in PCS, the current injection is not highly directional as in tunnel spectroscopy but occurs in the whole half space, although with an angle-dependent probability (Ref.) (see Appendix).
    • As a matter of fact, the polycrystal nature of the sample prevents us from controlling the direction of current injection in the crystallites and, if the gap had d -wave symmetry, small deviations from the antinodal directions (even of an angle as small as π/12) would lead to the appearance of the zero-bias peak. This is more true if one takes into account that, in PCS, the current injection is not highly directional as in tunnel spectroscopy but occurs in the whole half space, although with an angle-dependent probability (Ref.) (see Appendix).
  • 34
    • 67649396461 scopus 로고    scopus 로고
    • note
    • The temperature dependence of Δ1 and Δ2 shown in Fig. 3 cannot be reproduced within the standard two-band Eliashberg theory. If a conventional s -wave symmetry is supposed for both gaps using a weak (very strong) intraband coupling [λ11 =0.4, λ22 =4] and a very large (small) effective boson frequency [Ω1 =105 meV, Ω2 =6.15 meV] for the band related to Δ1 (Δ2) as well as a very small interband coupling [λ12 = λ21 = 10-3, Ω12 =55.6 meV] and no Coulomb pseudopotential allows reproducing the disappearance of Δ2 at about 22 K but not the tail in Δ1 nor the experimental values of the low-temperature gap amplitudes (that instead turn out to be too similar to each other: Δ1 =4.5 meV and Δ2 =5.5 meV). Similar considerations hold if a s+ - s- symmetry is used instead with a dominant interband coupling as proposed in Ref.: neither the temperature dependence nor the gap amplitudes can be obtained by a two-band model.
  • 44
    • 15744405524 scopus 로고    scopus 로고
    • 10.1103/PhysRevB.71.054501
    • E. J. Nicol and J. P. Carbotte, Phys. Rev. B 71, 054501 (2005). 10.1103/PhysRevB.71.054501
    • (2005) Phys. Rev. B , vol.71 , pp. 054501
    • Nicol, E.J.1    Carbotte, J.P.2

* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.