On the "spin-freezing" mechanism in underdoped superconducting cuprates

Abstract

The letter deals with the spin-freezing process observed by means of NMR-NQR relaxation or by muon spin rotation in underdoped cuprate superconductors. This phenomenon, sometimes referred as coexistence of antiferromagnetic and superconducting order parameters, is generally thought to result from randomly distributed magnetic moments related to charge inhomogeneities (possibly stripes) which exhibit slowing down of their fluctuations on cooling below T${}_c$ . Instead, we describe the experimental findings as due to fluctuating, vortex-antivortex, orbital currents state coexisting with d-wave superconducting state. A direct explanation of the experimental results, in underdoped Y${}_{1-x}$Ca${}_x$Ba${}_2$Cu${}_3$O${}_{6.1}$ and La${}_{2-x}$SrCuO${}_4$, is thus given in terms of freezing of orbital current fluctuations.

References in corpus (4)

• Antiferromagnetic ordering in superconducting $\mathbf{YB}{\mathbf{a}}_2\mathbf{C}{\mathbf{u}}_3{\mathbf{O}}_{6.5}$
• Observation of Magnetic Moments in the Superconducting State of YBa${}_2$Cu${}_3$O${}_{6.6}$
• Dynamical charge susceptibility in layered cuprates: the influence of screened inter-site Coulomb repulsion
• Characteristic features of d pairing in bilayer cuprates under conditions of Peierls instability of the normal phase

Cited by in corpus (6)

• Similar glassy features in the NMR response of pure and disordered La1.88Sr0.12CuO4
• Superconductivity in an almost localized Fermi liquid of quasiparticles with spin-dependent masses and effective field induced by electron correlations
• Field-dependent diamagnetic transition in magnetic superconductor $S{m}_{1.85}C{e}_{0.15}Cu{O}_{4-y}$
• 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
• Network patterns and strength of orbital currents in layered cuprates
• Inhomogeneity of the intrinsic magnetic field in superconducting YBa2Cu3OX compounds as revealed by rare-earth EPR-probe