Absence of Broken Time-Reversal Symmetry in the Pseudogap State of the High Temperature La2−xSrxCuO4 Superconductor from Muon-Spin-Relaxation Measurements

G. J. MacDougall; A. A. Aczel; J. P. Carlo; T. Ito; J. Rodriguez; P. L. Russo; Y. J. Uemura; S. Wakimoto; G. M. Luke

doi:10.1103/PhysRevLett.101.017001

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Absence of Broken Time-Reversal Symmetry in the Pseudogap State of the High Temperature La2−xSrxCuO4 Superconductor from Muon-Spin-Relaxation Measurements

G. J. MacDougall, A. A. Aczel, J. P. Carlo, T. Ito, J. Rodriguez, P. L. Russo, Y. J. Uemura, S. Wakimoto, G. M. Luke

DOI 10.1103/PhysRevLett.101.017001 · Physical Review Letters

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Abstract

We have performed zero-field muon-spin-relaxation measurements on single crystals of La2−xSrxCuO4 to search for spontaneous currents in the pseudogap 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 pseudogap. Comparison between experimental limits and the proposed circulating current states effectively eliminates the possibility that such states exist in this family of materials.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
La2-xSrxCuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
La1.87Sr0.13CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
Bi2Sr2CaCu2O8+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
YBa2Cu3O6+x Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
HgBa2CuO4+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown