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Loop current order and d-wave superconductivity: Some observable consequences

Author(s)
Allais, Andrea; Todadri, Senthil
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Abstract
Loop current order has been reported in the pseudogap regime of a few cuprate systems in polarized neutron scattering experiments. Here we study several observable consequences of such order in the d-wave superconducting state at low T. The symmetries of the loop order remove degeneracy between momenta k[superscript →] and −k[superscript →]. Consequently there is a remnant Bogoliubov Fermi surface in the superconducting state. Bounds on the possible existence of such a Fermi surface may be placed from existing data. Detecting such a Fermi surface will be a very useful confirmation of the existence of loop order in various cuprates. We show through explicit calculations that the Bogoliubov Fermi surface does not display quantum oscillations in a magnetic field consistent with natural expectations. Inclusion of a field-induced spin stripe order reconstructs the Bogoliubov Fermi surface to develop pockets which then show quantum oscillations in the superconducting state. Difficulties with interpreting quantum oscillation data in the cuprates along these lines are pointed out.
Date issued
2012-07
URI
http://hdl.handle.net/1721.1/73859
Department
Massachusetts Institute of Technology. Department of Physics
Journal
Physical Review B
Publisher
American Physical Society
Citation
Allais, Andrea, and T. Senthil. “Loop Current Order and D-wave Superconductivity: Some Observable Consequences.” Physical Review B 86.4 (2012). ©2012 American Physical Society
Version: Final published version

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