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arXiv · 1102.3864

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

Roland Zeyher·Andrés Greco
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Abstract

The isotope coefficient $β$ 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 $β$ in the pseudogap region is generically incompatible with Fermi arcs in the pseudogap state. Thus only the second model shows a large increase of $β$ 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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Roland Zeyher, Andrés Greco. 2011-02-18. Fermi arcs and isotope effect of the magnetic penetration depth in underdoped cuprates. https://doi.org/10.1209/0295-5075%2F93%2F67002

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