Upper Pseudogap Phase: Magnetic Characterizations

Abstract

It is proposed that the upper pseudogap phase (UPP) observed in the high-Tc cuprates correspond to the formation of spin singlet pairing under the bosonic resonating-valence-bond (RVB) description. We present a series of evidence in support of such a scenario based on the calculated magnetic properties including uniform spin susceptibility, spin-lattice and spin-echo relaxation rates, which consistently show that strong spin correlations start to develop upon entering the UPP, being enhanced around the momentum (π, π) while suppressed around (0, 0). The phase diagram in the parameter space of doping concentration, temperature, and external magnetic field, is obtained based on the the bosonic RVB theory. In particular, the competition between the Zeeman splitting and singlet pairing determines a simple relation between the "critical" magnetic field, H_{PG}, and characteristic temperature scale, T0, of the UPP. We also discuss the magnetic behavior in the lower pseudogap phase at a temperature Tv lower than T0, which is characterized by the formation of Cooper pair amplitude where the low-lying spin fluctuations get suppressed at both (0, 0) and (π, π). Properties of the UPP involving charge channels will be also briefly discussed.

11 pages, 5 figures, final version to appear in PRB

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Cited by in corpus (12)

• The Nernst effect in high-$T_c$ superconductors
• Luttinger-volume violating Fermi liquid in the pseudogap phase of the cuprate superconductors
• Phase String Theory for Doped Antiferromagnets
• Phase fluctuations in two-dimensional superconductors and pseudogap phenomenon
• Magnetization, Nernst effect and vorticity in the cuprates
• Lower Pseudogap Phase: A Spin/Vortex Liquid State
• Spin-roton excitations in the cuprate superconductors
• Mutual Chern-Simons Theory of Spontaneous Vortex Phase
• Charge dynamics in the phase string model for high-Tc superconductors
• Monopoles, confinement and charge localization in the t-J model with dilute holes
• Mottness, Phase String, and High-$T_c$ Superconductivity
• Effect of phase string on single-hole dynamics in the two-leg Hubbard ladder