Network patterns and strength of orbital currents in layered cuprates

Abstract

In a frame of the $t-J-G$ model we derive the microscopical expression for the circulating orbital currents in layered cuprates using the anomalous correlation functions. In agreement with $\mu$-on spin relaxation ($\mu$SR), nuclear quadrupolar resonance (NQR) and inelastic neutron scattering(INS) experiments in YBa${}_2$Cu${}_3$O${}_{6+x}$ we successfully explain the order of magnitude and the monotonous increase of the {\it internal} magnetic fields resulting from these currents upon cooling. However, the jump in the intensity of the magnetic fields at T${}_c$ reported recently seems to indicate a non-mean-field feature in the coexistence of current and superconducting states and the deviation of the extended charge density wave vector instability from its commensurate value {\bf Q}$\approx (\pi ,\pi$) in accordance with the reported topology of the Fermi surface.

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Cited by in corpus (4)

• Phase transition and anomalous electronic behavior in layered dichalcogenide CuS (covellite) probed by NQR
• Possible isotope effect on the resonance peak formation in high-T${}_c$ cuprates
• Dynamical spin susceptibility and the resonance peak in the pseudogap region of the underdoped cuprate superconductors
• Evidence for the formation of magnetic moments in the cuprate superconductor Hg${}_{0.8}$Cu${}_{0.2}$Ba${}_2$Ca${}_2$Cu${}_3$O${}_{8+\delta }$ below $T_c$ seen by NQR