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

Zeyher, R.; Greco, A.

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

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Zeyher, R.
Department Quantum Many-Body Theory (Walter Metzner), Max Planck Institute for Solid State Research, Max Planck Society;
Former Departments, Max Planck Institute for Solid State Research, Max Planck Society;

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Greco, A.
Department Quantum Many-Body Theory (Walter Metzner), Max Planck Institute for Solid State Research, Max Planck Society;

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Zeyher, R., & Greco, A. (2011). Fermi arcs and isotope effect of the magnetic penetration depth in underdoped cuprates. EPL, 93(6): 67002.

Cite as: https://hdl.handle.net/21.11116/0000-000E-C003-5

Abstract

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). Copyright (C) EPLA, 2011