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The Meissner effect in a strongly underdoped cuprate above its critical temperature

Author

Listed:
  • Elvezio Morenzoni

    (Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute)

  • Bastian M. Wojek

    (Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute
    Physik-Institut, Universität Zürich)

  • Andreas Suter

    (Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute)

  • Thomas Prokscha

    (Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute)

  • Gennady Logvenov

    (Brookhaven National Laboratory
    Present address: Technology Service Group, Max-Planck Institut für Festkörperforschung, 70569 Stuttgart, Germany.)

  • Ivan Božović

    (Brookhaven National Laboratory)

Abstract

The Meissner effect and associated perfect 'bulk' diamagnetism together with zero resistance and gap opening are characteristic features of the superconducting state. In the pseudogap state of cuprates, unusual diamagnetic signals and anomalous proximity effects have been detected, but a Meissner effect has never been observed. Here we probe the local diamagnetic response in the normal state of an underdoped La1.94Sr0.06CuO4 layer (Tc′≤5 K), which is brought into close contact with two nearly optimally doped La1.84Sr0.16CuO4 layers (Tc≈32 K). We show that the entire 'barrier' layer of thickness, much larger than the typical c axis coherence lengths of cuprates, exhibits a Meissner effect at temperatures above Tc′ but below Tc. The temperature dependence of the effective penetration depth and superfluid density in different layers indicates that superfluidity with long-range phase coherence is induced in the underdoped layer by the proximity to optimally doped layers, but this induced order is sensitive to thermal excitation.

Suggested Citation

  • Elvezio Morenzoni & Bastian M. Wojek & Andreas Suter & Thomas Prokscha & Gennady Logvenov & Ivan Božović, 2011. "The Meissner effect in a strongly underdoped cuprate above its critical temperature," Nature Communications, Nature, vol. 2(1), pages 1-8, September.
    • Handle: RePEc:nat:natcom:v:2:y:2011:i:1:d:10.1038_ncomms1273
    DOI: 10.1038/ncomms1273
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