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

被引：11

作者：

Allais, Andrea ^{[1
]}

Senthil, T. ^{[1
]}

机构：

[1] MIT, Dept Phys, Cambridge, MA 02139 USA

来源：

PHYSICAL REVIEW B | 2012年 / 86卷 / 04期

基金：

美国国家科学基金会;

关键词：

FERMI-SURFACE; STRIPE ORDER;

D O I：

10.1103/PhysRevB.86.045118

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

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) over right arrow and -(k) over right arrow. 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.

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