Identifying Collective Modes via Impurities in the Cuprate Superconductors

Details Identifying Collective Modes via Impurities in the Cuprate Superconductors Identifying Collective Modes via Impurities in the Cuprate Superconductors

2007-03-26

arxiv.org/abs/cond-mat/0703684v1

Phys. Rev. B 78, 054504 (2008)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 4 figures

Scientific paper

10.1103/PhysRevB.78.054504

We show that the pinning of collective charge and spin modes by impurities in the cuprate superconductors leads to qualitatively different fingerprints in the local density of states (LDOS). In particular, in a pinned (static) spin droplet, the creation of a resonant impurity state is suppressed, the spin-resolved LDOS exhibits a characteristic spatial pattern, and the LDOS undergoes significant changes with increasing magnetic field. Since all of these fingerprints are absent in a charge droplet, impurities are a new probe for identifying the nature and relative strength of collective modes.

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