Erez Berg et al 2009 New J. Phys. 11 115004 doi:10.1088/1367-2630/11/11/115004
Striped superconductors: how spin, charge and superconducting orders intertwine in the cuprates
Focus on Superconductors with Exotic SymmetriesErez Berg1, Eduardo Fradkin2, Steven A Kivelson1 and John M Tranquada3
Show affiliationsPart of Focus on Superconductors with Exotic Symmetries
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−xSrxCuO4 in a magnetic field, neutron scattering experiments in underdoped YBa2Cu3O6+x and a host of anomalies seen in STM and ARPES studies of Bi2Sr2CaCu2O8+δ.
- PACS
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74.40.+k Fluctuations (noise, chaos, nonequilibrium superconductivity, localization, etc.)
- Subjects
- Dates
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Issue 11 (November 2009)
Received 30 January 2009
Published 4 November 2009
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Striped superconductors: how spin, charge and superconducting orders intertwine in the cuprates
Erez Berg et al 2009 New J. Phys. 11 115004
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