The Ground State of the Pseudogap in Cuprate Superconductors

T. Valla; A. V. Fedorov; Jinho Lee; J. C. Davis; G. D. Gu

doi:10.1126/science.1134742

paper

The Ground State of the Pseudogap in Cuprate Superconductors

arXiv:cond-mat/0612672 · doi:10.1126/science.1134742

Abstract

We present studies of the electronic structure of La2-xBaxCuO4, a system where the superconductivity is strongly suppressed as static spin and charge orders or "stripes" develop near the doping level of x=1/8. Using angle-resolved photoemission and scanning tunneling microscopy, we detect an energy gap at the Fermi surface with magnitude consistent with d-wave symmetry and with linear density of states, vanishing only at four nodal points, even when superconductivity disappears at x=1/8. Thus, the non-superconducting, "striped" state at x=1/8 is consistent with a phase incoherent d-wave superconductor whose Cooper pairs form spin/charge ordered structures instead of becoming superconducting.

arXiv commentThis is the author's version of the work

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