On the relations among the pseudogap, electronic charge order and Fermi-arc superconductivity in Bi₂Sr₂CaCu₂O_8+δ

d-Wave Superconductivity and s-Wave Charge Density Waves: Coexistence between Order Parameters of Different Origin and Symmetry

“…Such a behavior, as they indicated, might be related to the existence of commensurate and incommensurate CDW gaps in a close analogy with the case of dichalcogenides [210]. Moreover, photoemission studies of La 1.875 Ba 0.125 CuO 4 have shown [211] that there seems to be two different pseudogaps: (i) a d-wave-like pseudogap, which is a precursor to superconductivity, near the node of the truly superconducting gap; and (ii) a pseudogap, which became more or less familiar to the community during last years [96,107,187,[203][204][205][206] and is identified by us as the CDW gap, in the antinodal momentum region. In Reference [212], it was found by ARPES that actually it may be three distinct energy scales, corresponding to pseudogap, fluctuating superconductivity onset and coherence onset temperatures.…”

“…By doing this we rely not only on direct observations of CDWs in the real r-space but also on the identification of mysterious pseudogaps (the energy gaps of a still ambiguous nature both below and above the critical temperature, T c ) often observed in high-T c ceramics [100,101,[106][107][108][109][110][111][112] with the CDW gaps. We emphasize that the observed coherent long-range phenomena occur against a non-homogeneous background of the intrinsically non-stoichiometric materials [113][114][115][116][117][118].…”

Unscaling Superconducting Parameters with Tc for Bi-2212 and Bi-2223: A Magnetotransport Study in the Superconductive Fluctuation Regime

“…33) Therefore, the d-wave superconducting gap is restricted to opening mainly on the Fermi arc and the gap amplitude reaches a maximum at the arc edge. Thus, the "effective" gap, ∆ S G (hereafter, ∆ S G means the "effective" gap value), is given by ∆ S G ∝ L a ∆ 0 , 34) where L a is the length of the Fermi arc. Since L a shrinks with decreasing doping, 35) ∆ S G may decrease, as has been pointed out by Oda et al 34) This fact explains the increase in ξ ab with decreasing doping.…”

Interband Nodal-Region Pairing And the Antinodal Pseudogap in Hole Doped Cuprates

“…Some essential results have been obtained quite recently, e.g. the coexistence of the pseudogap (PG) and of the superconducting gap (SCG) with the own energy scales at fixed doping [3][4][5][6][7][8][9][10]. The extraction of a true SCG from the background becomes possible [11,12].…”

“…The extraction of a true SCG from the background becomes possible [11,12]. The presence of the Fermi surface (FS) fragments in the form of arcs at underdoping [5,8,10,13] has been controlled by measuring the Shubnikov-de Haas oscillations [14][15][16]. The distinct reveal of the two SCG in cuprates succeed in [6] which was expected for long.…”