TITLE

Vortex melting line and anisotropy of high-pressure-synthesized TlBa[sub 2]Ca[sub 2]Cu[sub 3]O[sub 10-y] high-temperature superconductor from third-harmonic susceptibility studies

AUTHOR(S)
Crisan, A.; Iyo, A.; Tanaka, Y.
PUB. DATE
July 2003
SOURCE
Applied Physics Letters;7/21/2003, Vol. 83 Issue 3, p506
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
The fundamental and third-harmonic susceptibility response of Yba[SUB2]Cu[SUB3]O[SUB7 - δ] (YBCO) and TlBa[SUB2]Ca[SUB2]Cu[SUB3]O[SUB10-y] (Tl:1223) high-critical temperature (T[SUBc]) 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-T[SUBc] 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 T[SUBc] 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.
ACCESSION #
10281596

 

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