Fermi arcs and isotope effect of the magnetic penetration depth in underdoped cuprates

Details Fermi arcs and isotope effect of the magnetic penetration depth in underdoped cuprates Fermi arcs and isotope effect of the magnetic penetration depth in underdoped cuprates

2011-02-18

arxiv.org/abs/1102.3864v1

Physics

Condensed Matter

Superconductivity

5 pages, 3 figures, will appear as epl

Scientific paper

The isotope coefficient $\beta$ of the magnetic penetration depth in the superconducting state is studied at T=0 for a $d$-CDW and a nodal metal model. Disregarding superconductivity the Fermi surface of the first model possesses arcs whereas the second model has no arcs. We show that a large increase of $\beta$ in the pseudogap region is generically incompatible with Fermi arcs in the pseudogap state. Thus only the second model shows a large increase of $\beta$ with decreasing doping. The required electron-phonon coupling is small and compatible with first-principles calculations based on the local density approximation (LDA).

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