Pairing Symmetry in Cuprate Superconductors: Phase-Sensitive Tests

Tsuei, C. C.; Kirtley, J. R.

doi:10.1007/978-3-642-55675-3_9

Cited by 1 publication

(1 citation statement)

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“…It is remarkable that, for hole-and electron-doped cuprates, there is still no clarity concerning the specific mechanisms of superconductivity [17,[107][108][109][110][111][112][113][114][115] and the order parameter symmetry [109,[116][117][118][119][120][121][122][123][124][125][126][127][128][129][130], contrary to the "official" viewpoint [131][132][133]) and even the very character of the phenomenon (in particular, there have been furious debates concerning the Cooper pairing versus boson condensation dilemma in cuprates [8,134,135]). The same seems to be true for other old and new "exotic" superconductors [46,107,108,[136][137][138][139][140][141][142][143][144][145][146]…”

Section: Introductionmentioning

confidence: 99%

Competition of Superconductivity and Charge Density Waves in Cuprates: Recent Evidence and Interpretation

Gabovich

Войтенко

Ekino

et al. 2010

Advances in Condensed Matter Physics

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Explicit and implicit experimental evidence for charge density wave (CDW) presence in high-Tcsuperconducting oxides is analyzed. The theory of CDW superconductors is presented. It is shown that the observed pseudogaps and dip-hump structures in tunnel and photoemission spectra are manifestations of the same CDW gapping of the quasiparticle density of states. Huge pseudogaps are transformed into modest dip-hump structures at low temperatures,T, when the electron spectrum superconducting gapping dominates. Heat capacity jumps at the superconducting critical temperature and the paramagnetic limit are calculated for CDW superconductors. For a certain range of parameters, the CDW state in ad-wave superconductor becomes reentrant withT, the main control quantity being a portion of dielectrcally gapped Fermi surface. It is shown that in the weak-coupling approximation, the ratio between the superconducting gap at zero temperatureΔ(T=0)andTchas the Bardeen-Cooper-Schrieffer value fors-wave Cooper pairing and exceeds the corresponding value ford-wave pairing of CDW superconductors. Thus, large experimentally found values2Δ(T=0)/Tc≈5÷8are easily reproduced with reasonable input parameter values of the model. The conclusion is made that CDWs play a significant role in cuprate superconductivity.

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