Evidence for a Competition between the Superconducting State and the Pseudogap State of(BiPb)2(SrLa)2CuO6+δ

Abstract

The in-plane magnetic penetration depth lambda ab in optimally doped (BiPb)2(SrLa)2CuO6+delta (OP Bi2201) was studied by means of muon-spin rotation. The measurements of lambda ab(-2)(T) are inconsistent with a simple model of a d-wave order parameter and a uniform quasiparticle weight around the Fermi surface. The data are well described assuming the angular gap symmetry obtained in ARPES experiments [Phys. Rev. Lett. 98, 267004 (2007)], which suggest that the superconducting gap in OP Bi2201 exists only in segments of the Fermi surface near the nodes. The remaining parts of the Fermi surface, which are strongly affected by the pseudogap state, do not contribute significantly to the superconducting condensate.

Competition Between the Pseudogap and Superconducting States ofBi2Sr2Ca0.92Y0.08Cu2OCoslovich1, Giannetti2, Cilento3 et al. 2013Phys. Rev. Lett.454450View full textAdd to dashboardCite

“…A ratio smaller than 1 indicates that phase competition is weak enough to allow the coexistence of PG and SC phases [8], therefore rationalizing the apparent dichotomy of coexistence and competition reported in the literature [10,12,15].…”

“…Their mutual coupling, i.e., the mixed terms in a multi-component Ginzburg-Landau (GL) free energy expansion, plays a key role in determining the unconventional electronic properties of these materials [5][6][7][8]. A particularly interesting case is given by the pseudogap (PG) and superconducting (SC) phases in cuprates, where the debate between a competing order (positive free energy coupling term) [9,10] or a cooperative order scenario (negative free energy coupling term) [11,12] is still unresolved.…”

Point nodes persisting far beyond Tc in Bi2212

“…Many experimental evidences123456789 point to a competing-order origin, rather than the preformed pair, for the pseudogap observed around the antinode with the maximum energy gap. The pseudogap state has been revealed to sharply diminishes toward the antinode and disappear far off the node by the spectral weight analysis for the angle-resolved photoemission spectroscopy (ARPES) data of optimally doped samples9.…”

Competition between the pseudogap and superconductivity in the high-Tc copper oxides

“…Recent experimental evidence demonstrates that the pseudogap and the superconducting gap are associated with different energy scales [9,10,11,12,13,14]. It is however not clear whether they coexist independently or compete [9,12,14,15]. In order to understand the physics of cuprates and improve their superconducting properties it is vital to determine whether the pseudogap is friend or foe of high temperature supercondctivity [16].…”