Local Moment Formation in the Superconducting State of a Doped Mott Insulator

Details Local Moment Formation in the Superconducting State of a Doped Mott Insulator Local Moment Formation in the Superconducting State of a Doped Mott Insulator

2002-05-15

arxiv.org/abs/cond-mat/0205301v2

Phys. Rev. Lett. vol. 89, 217002 (2002).

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 3 figures, revised version, to be published in Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.89.217002

A microscopic theory is presented for the local moment formation near a non-magnetic impurity or a copper defect in high-T_c superconductors. We use a renormalized meanfield theory of the t-J model for a doped Mott insulator and study the fully self-consistent, spatially unrestricted solutions of the d-wave superconducting (SC) state in both the spin S=0 and S=1/2 sectors. We find a transition from the singlet d-wave SC state to a spin doublet SC state when the renormalized exchange coupling exceeds a doping dependent critical value. The induced S=1/2 moment is staggered and localized around the impurity. It arises from the binding of an S=1/2 nodal quasiparticle excitation to the impurity. The local density of states spectrum is calculated and connections to NMR and STM experiments are discussed.

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