c-axis coupling in underdoped Bi2Sr2CaCu2O8+δ with varying degrees of disorder

Panayotis Spathis, Sylvain Colson, Feng Yang, Cornelis J. van der Beek, Piotr Gierłowski, Takasada Shibauchi, Yuji Matsuda, Marat Gaifullin, Ming Li, and Peter H. Kes
Phys. Rev. B 77, 104503 – Published 4 March 2008

Abstract

The dependence of the Josephson plasma resonance (JPR) frequency in heavily underdoped Bi2Sr2CaCu2O8+δ on temperature and controlled pointlike disorder, introduced by high-energy electron irradiation, is cross-correlated and compared to the behavior of the ab-plane penetration depth. It is found that the square of the zero-temperature plasma frequency, representative of the superfluid component of the c-axis spectral weight, decreases proportionally with Tc when the disorder is increased. The temperature dependence of the JPR frequency is the same for all disorder levels, including pristine crystals. The reduction of the c-axis superfluid density as function of disorder is accounted for by pair breaking induced by impurity scattering in the CuO2 planes, rather than by quantum fluctuations of the superconducting phase. The reduction of the c-axis superfluid density as function of temperature follows a T2 law and is accounted for by quasiparticle hopping through impurity-induced interlayer states.

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  • Received 22 October 2007

DOI:https://doi.org/10.1103/PhysRevB.77.104503

©2008 American Physical Society

Authors & Affiliations

Panayotis Spathis, Sylvain Colson, Feng Yang, and Cornelis J. van der Beek

  • Laboratoire des Solides Irradiés, Ecole Polytechnique, CNRS-UMR 7642 and CEA/DSM/DRECAM, 91128 Palaiseau, France

Piotr Gierłowski

  • Institute of Physics, Polish Academy of Sciences, 32/46 Aleja Lotników, 02-668 Warsaw, Poland

Takasada Shibauchi and Yuji Matsuda

  • Department of Physics, Kyoto University, Sakyo-ku, Kyoto 606-8502, Japan

Marat Gaifullin

  • National Institute for Materials Science, 1-2-1 Sengen, Tsukuba, Ibaraki 3050047, Japan and Department of Physics, Loughborough University, Loughborough LE11 3TU, United Kingdom

Ming Li and Peter H. Kes

  • Kamerlingh Onnes Laboratorium, Rijksuniversiteit Leiden, P.O. Box 9506, 2300 RA Leiden, The Netherlands

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Issue

Vol. 77, Iss. 10 — 1 March 2008

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