Linear and Field-Independent Relation between Vortex Core State Energy and Gap in Bi2Sr2CaCu2O8+δ

B. W. Hoogenboom, K. Kadowaki, B. Revaz, M. Li, Ch. Renner, and Ø. Fischer
Phys. Rev. Lett. 87, 267001 – Published 4 December 2001
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Abstract

We present a scanning tunneling spectroscopy study on quasiparticle states in vortex cores in Bi2Sr2CaCu2O8+δ. The energy of the observed vortex core states shows an approximately linear scaling with the superconducting gap in the region just outside the core. This clearly distinguishes them from conventional localized core states and is a signature of the mechanism responsible for their discrete appearance in high-temperature superconductors. The energy scaling of the vortex core states also suggests a common nature of vortex cores in Bi2Sr2CaCu2O8+δ and YBa2Cu3O7δ. Finally, these states do not show any dependence on the applied magnetic field between 1 and 6 T.

  • Received 28 May 2001

DOI:https://doi.org/10.1103/PhysRevLett.87.267001

©2001 American Physical Society

Authors & Affiliations

B. W. Hoogenboom1, K. Kadowaki2, B. Revaz1,*, M. Li3, Ch. Renner4, and Ø. Fischer1

  • 1DPMC, Université de Genève, 24 Quai Ernest-Ansermet, 1211 Genève 4, Switzerland
  • 2Institute of Materials Science, University of Tsukuba, Tsukuba, Ibaraki 305-8573, Japan
  • 3Kamerlingh Onnes Laboratory, Leiden University, P.O. Box 9506, 2300 RA Leiden, The Netherlands
  • 4NEC Research Institute, 4 Independence Way, Princeton, New Jersey 08540

  • *Present address: Department of Physics, University of California at San Diego, 9500 Gilman Drive, La Jolla, CA 92093.

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Vol. 87, Iss. 26 — 24 December 2001

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