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Precursor diamagnetism above the superconducting transition in La1.9Sr0.1CuO4

A. Lascialfari, A. Rigamonti, L. Romano’, A. A. Varlamov, and I. Zucca
Phys. Rev. B 68, 100505(R) – Published 17 September 2003
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Abstract

High-resolution isothermal magnetization curves above the transition temperature Tc in a single crystal of superconducting underdoped cuprate La1.9Sr0.1CuO4 (Tc=26K) are reported. For magnetic field H>~1kOe the diamagnetic magnetization is rather well described by the Ginzburg-Landau theory in finite fields, as observed in previous works. On the contrary, in the low-field range and for T within Tc+2K, evidence is given for precursor diamagnetism of different character, with magnetization curves displaying an upturn in the field dependence and magnetic-history dependent effects below T27K. These findings are the magnetic counterpart of the observation by scanning superconducting quantum interference device microscopy of regions precursor of bulk superconductivity. The interpretation of the experimental data in terms of phase fluctuations of local order parameter is shown to account for most of the aspects of the precursor diamagnetism, which appears to be a general phenomenon in cuprates.

  • Received 1 August 2003

DOI:https://doi.org/10.1103/PhysRevB.68.100505

©2003 American Physical Society

Authors & Affiliations

A. Lascialfari1, A. Rigamonti1, L. Romano’2, A. A. Varlamov3, and I. Zucca1

  • 1Department of Physics “A. Volta” and Unita’ INFM, University of Pavia, Via Bassi 6, I-27100 Pavia, Italy
  • 2Department of Physics and Unita’ INFM, University of Parma, Parco Area delle Scienze 7A, I-43100 Parma, Italy
  • 3Unita’ INFM “Tor Vergata,” Department STFE, University of Roma, Tor Vergata 110, I-00133 Roma, Italy

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Vol. 68, Iss. 10 — 1 September 2003

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