Pair breaking caused by magnetic impurities in the high-temperature superconductor Bi2.1Sr1.9Ca(Cu

Anisotropic scattering rate in Fe-substitutedBi2Sr2Ca(Cu1−xFex)2Naamneh1, Lubashevsky2, Lahoud3 et al. 2015Phys. Rev. B1000View full textAdd to dashboardCite

“…Around the anti-node the scattering rate in the 3% Fe sample is three times larger than the scattering rate found in the pristine sample. We find that both Zn and Fe substitution increases the pair-breaking in agreement with previous work [8], but this is a small effect compared to the increase in the scattering-rate. The momentum dependent scattering rate of a metal is given by: Single-particle scattering rate, Γ 1 as function of the Fermi-surfce angle.…”

Energy gaps in high-transition-temperature cuprate superconductors

“…3d), 26,63 which has the same spectral weight as the lower quasiparticle peak below E F when the effects of the Fermi cutoff are accounted for. Although there have recently been extensive debates about what temperature the near-nodal gap closes (see also Box 1), 19,62,[64][65][66] these signatures in the temperature dependence near the node are reminiscent of the BCS theory, suggesting that it is primarily attributable to superconductivity.…”

“…Notably, some recent results more directly suggest that a d-wave gap above T > T c around the node. 62,[64][65][66] The detailed temperature and momentum dependence studies suggest that there is a characteristic temperature T pair (T c < T pair < T*) where a d-wave gap opens. 62 The integrated ARPES spectra perpendicular to the Fermi surface suggest that the energy gap is insensitive to T c and the scattering rate increases rapidly across T c around the node.…”

“…Particularly, it has been reported that both the gaps for a competing order and superconductivity persist above T c . 55,57,62 Whether the two orders coexist microscopically 12,13 or not, how they are entangled if they coexist, how the ARPES background signal contributes to the spectra around the antinode, 73 and what temperature the fluctuation goes away 19,57,62,[64][65][66]…”

Invited Article: High resolution angle resolved photoemission with tabletop 11 eV laser

“…Previous laser-based ARPES studies at both 6 eV and 7 eV photon excitation energies have provided tremendous insights towards near-nodal excitation, yet the antinodal region near the BZ boundary was not accessible with these low photon energies. [50][51][52][53] Fig. 9(a) compares the Fermi surface in the superconducting state obtained by 11 eV (upper left quadrant) and 7 eV (upper right quadrant) photoemission.…”