Absence of time reversal symmetry breaking in La_{2-x}Sr_{x}CuO_{4}

Abstract

We have performed zero-field muon spin rotation measurements on single crystals of La_{2-x}Sr_{x}CuO_{4} to search for spontaneous currents in the pseudo-gap state. By comparing measurements on materials across the phase diagram, we put strict upper limits on any possible time-reversal symmetry breaking fields that could be associated with the pseudo-gap. Comparison between experimental limits and proposed circulating current states effectively eliminates the possibility that such states exist in this family of materials.

Submitted to Phys. Rev. Lett. (2008)

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• Gutzwiller Magnetic Phase Diagram of the Cuprates
• Absence of $\mu$SR evidence for magnetic order in the pseudogap phase of Bi${}_{2+x}$Sr${}_{2-x}$CaCu${}_2$O${}_{8+\delta }$
• Coexistence of magnetic and charge order in a two-component order parameter description of the layered superconductors
• Is the pseudogap a topological state?
• Theory of charged impurities in correlated electron materials: Application to muon spectroscopy of high-Tc superconductors
• Signatures of orbital loop currents in the spatially resolved local density of states
• Muon Spin Relaxation and fluctuating magnetism in the pseudogap phase of YBa${}_2$Cu${}_3$O${}_y$
• Loop currents in ladder cuprates: A dynamical mean field theory study
• Intra-unit-cell Magnetic Order in Stoichiometric La${}_2$CuO${}_4$
• Microscopic evidence for imaginary charge density wave in a kagome metal