The Ground State of the Pseudogap in Cuprate Superconductors

Details The Ground State of the Pseudogap in Cuprate Superconductors The Ground State of the Pseudogap in Cuprate Superconductors

2006-12-28

arxiv.org/abs/cond-mat/0612672v1

Science 314, 1914 (2006)

Physics

Condensed Matter

Superconductivity

This is the author's version of the work

Scientific paper

10.1126/science.1134742

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.

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