4.6 Review

Striped superconductors: how spin, charge and superconducting orders intertwine in the cuprates

Journal

NEW JOURNAL OF PHYSICS
Volume 11, Issue -, Pages -

Publisher

IOP PUBLISHING LTD
DOI: 10.1088/1367-2630/11/11/115004

Keywords

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Funding

  1. National Science Foundation [DMR 0758462, DMR 0531196]
  2. Office of Science, US Department of Energy [DE-FG02-91ER45439, DE-FG02-06ER46287, DE-AC02-98CH10886]
  3. Direct For Mathematical & Physical Scien
  4. Division Of Materials Research [0758462] Funding Source: National Science Foundation

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Recent transport experiments in the original cuprate high temperature superconductor, La2-xBaxCuO4, have revealed a remarkable sequence of transitions and crossovers that give rise to a form of dynamical dimensional reduction, in which a bulk crystal becomes essentially superconducting in two directions while it remains poorly metallic in the third. We identify these phenomena as arising from a distinct new superconducting state, the 'striped superconductor', in which the superconducting order is spatially modulated, so that its volume average value is zero. Here, in addition to outlining the salient experimental findings, we sketch the order parameter theory of the state, stressing some of the ways in which a striped superconductor differs fundamentally from an ordinary (uniform) superconductor, especially concerning its response to quenched randomness. We also present the results of density matrix renormalization group calculations on a model of interacting electrons in which sign oscillations of the superconducting order are established. Finally, we speculate concerning the relevance of this state to experiments in other cuprates, including recent optical studies of La2-xBaxCuO4 in a magnetic field, neutron scattering experiments in underdoped YBa2Cu3O6+x and a host of anomalies seen in STM and ARPES studies of Bi2Sr2CaCu2O8+delta.

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