260 research outputs found
Inter-layer Josephson coupling in stripe-ordered superconducting cuprates
Motivated by experiments on LBCO-1/8 which suggest that stripe order
co-exists with two-dimensional pairing without inter-layer phase coherence over
an extended range of temperatures, we determine the inter-layer Josephson
coupling in the presence of stripe order. We employ a mean-field description of
bond-centered stripes, with a zero-momentum superconducting condensate and
alternating stripe directions pinned by the low-temperature tetragonal (LTT)
lattice structure. We show that the Fermi-surface reconstruction arising from
strong stripe order can suppress the Josephson coupling between adjacent layers
by more than an order of magnitude.Comment: 4 pages, 4 fig
Spin excitations in fluctuating stripe phases of doped cuprate superconductors
Using a phenomenological lattice model of coupled spin and charge modes, we
determine the spin susceptibility in the presence of fluctuating stripe charge
order. We assume the charge fluctuations to be slow compared to those of the
spins, and combine Monte Carlo simulations for the charge order parameter with
exact diagonalization of the spin sector. Our calculations unify the spin
dynamics of both static and fluctuating stripe phases and support the notion of
a universal spin excitation spectrum in doped cuprate superconductors.Comment: 4 pages, 4 figs, minor changes, final version as publishe
Reply to Comment by S. Friedemann et al. on "Zeeman-Driven Lifshitz Transition: A Model for the Experimentally Observed Fermi-Surface Reconstruction in YbRh2Si2"
A reply to the comment by S. Friedemann et al. [arXiv:1207.0536] on our
article [Phys. Rev. Lett. 106, 137002 (2011), arXiv:1012.0303].Comment: 2 pages, 1 fi
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