Two routes to magnetic order by disorder in underdoped cuprates

Details Two routes to magnetic order by disorder in underdoped cuprates Two routes to magnetic order by disorder in underdoped cuprates

2011-09-08

arxiv.org/abs/1109.1708v1

Phys. Rev. B 84, 184511 (2011)

Physics

Condensed Matter

Superconductivity

9 pages, 7 figures

Scientific paper

10.1103/PhysRevB.84.184511

We study disorder-induced magnetism within the Gutzwiller approximation applied to the t-J model relevant for cuprate superconductors. In particular, we show how disorder generates magnetic phases by inducing local droplets of antiferromagnetic order which eventually merge, and form a quasi-long range ordered state in the underdoped regime. We identify two distinct disorder-induced magnetic phases of this type depending on the strength of the scatterers. For weak potential scatterers used to model dopant disorder, charge reorganization may push local regions in-between the impurities across the magnetic phase boundary, whereas for strong scatterers used to model substitutional ions, a local static magnetic moment is formed around each impurity. We calculate the density of states and find a remarkably universal low-energy behavior largely independent of both disorder and magnetization. However, the magnetic regions are characterized by larger (reduced) superconducting gap (coherence peaks) and a sub-gap kink in the density of states.

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