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Vortex melting line and anisotropy of high-pressure-synthesized TlBa2Ca2Cu3O10–y high-temperature superconductor from third-harmonic susceptibility studies

Appl. Phys. Lett. 83, 506 (2003); doi:10.1063/1.1593824

Issue Date: 21 July 2003

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A. Crisan
Department of Physics, University of Bath, Claverton Down, Bath, BA2 7AY, United Kingdom and National Institute for Materials Physics, P.O. Box MG-7, 76900 Bucharest, Romania

A. Iyo and Y. Tanaka
Nanoelectronics Research Institute of AIST, AIST Tsukuba Central 2, 1-1-1 Umezono, Tsukuba, Ibaraki 305-8568, Japan
and Core Research for Evolutional Science and Technology of the Japan Science and Technology Corporation, Kawaguchi, Saitama, 332-0012 Japan
The fundamental and third-harmonic susceptibility response of YBa2Cu3O7–delta (YBCO) and TlBa2Ca2Cu3O10–y (Tl:1223) high-critical temperature (Tc) superconductors with preferentially oriented crystallites has been measured in various magnetic fields up to 14 T, and with very low ac field amplitude, to probe the melting transition of the vortex matter. This method does not require large single crystals, being therefore suitable for high-Tc superconductors with small crystallites, prepared with high-pressure synthesis techniques. We determine experimentally the melting line of vortices and the anisotropy factor in high-pressure-grown Tl:1223 with a high Tc of 133.5 K. Results from similar measurements on YBCO with preferentially oriented grains are consistent with both commonly accepted models of the melting line and values of the anisotropy factor, supporting the validity of our approach. ©2003 American Institute of Physics.
History: Received 25 March 2003; accepted 21 May 2003
Permalink: http://link.aip.org/link/?APPLAB/83/506/1
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KEYWORDS and PACS

Keywords
PACS
  • 74.25.Qt
    Vortex lattices, flux pinning, flux creep in superconductors
  • 74.72.Jt
    Other cuprates, including Tl and Hg-based cuprates (HTSC)
  • 74.25.Ha
    Magnetic properties of superconductors
  • 81.05.Je
    Ceramics and refractories: fabrication, treatment, testing and analysis including borides, carbides, hydrides, nitrides, oxides, and silicides
  • YEAR: 2003

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ISSN:
0003-6951 (print)   1077-3118 (online)
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