a-b anisotropy of the intra-unit-cell magnetic order in $\mathrm{YB}{\mathrm{a}}_2\mathrm{C}{\mathrm{u}}_3{\mathrm{O}}_{6.6}$

Abstract

Within the complex phase diagram of the hole-doped cuprates, seizing the nature of the mysterious pseudo-gap phase is essential to unravel the microscopic origin of high-temperature superconductivity. Below the pseudo-gap temperature ${\mathrm{T}}^{\star }$, evidences for intra-unit-cell orders breaking the 4-fold rotation symmetry have been provided by neutron diffraction and scanning tunneling spectroscopy. Using polarized neutron diffraction on a detwinned $\mathrm{YB}{\mathrm{a}}_2\mathrm{C}{\mathrm{u}}_3{\mathrm{O}}_{6.6}$ sample, we here report a distinct a-b anisotropy of the intra-unit-cell magnetic structure factor below ${\mathrm{T}}^{\star }$, highlighting that intra-unit-cell order in this material breaks the mirror symmetry of the CuO${}_2$ bilayers. This is likely to originate from a crisscrossed arrangement of loop currents within the $\mathrm{Cu}{\mathrm{O}}_2$ bilayer, resulting in a bilayer mean toroidal axis along the $\mathbf{b}$ direction.

arXiv commentText and 4 4 figures + supplementary materials (1 figure)

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• Comment on "No Evidence for Orbital Loop Currents in Charge Ordered $\mathrm{YB}{\mathrm{a}}_2\mathrm{C}{\mathrm{u}}_3{\mathrm{O}}_{6+\mathrm{x}}$ from Polarized Neutron Diffraction"
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