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M.O. Tjia
Departement of Physics, Institut Teknologi Bandung, Jl. Ganesa 10, Bandung 40132
Astronomy Computer Science & IT Earth & Planetary Sciences Electrical & Electronics Engineering Energy Engineering

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Oxygen Doping Effects on the Re-entrant Point of Vortex Melting Line in Bi2Sr2CaCu2O8+δ and YBa2Cu3O7-δ Superconducting System D. Ulfaty; M. Diantoro; W. Loeksmanto; M.O. Tjia
Indonesian Journal of Physics Vol 14 No 3 (2003): Vol. 14 No.2, Juli 2003
Publisher : Institut Teknologi Bandung

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Abstract

The complexity of vortex morphology of high Tc superconductor is marked among others by the existence of “re-entrant” phenomena of vortex melting lines in the B-T diagram. This peculiar behavior has its origin in the large anisotropy, disorder and thermal fluctuation effects. Materials having those characterictics are Bi2Sr2CaCu2O8+δ (BSCCO-2212) and YBa2Cu3O7-δ (YBCO-123). The re-entrant point (B*,T*) can be regarded as the intersection point between the low field melting curve and the high field melting curve. The values of B* and T* generally depend on the critical temperature (Tc), anisotropy factor (ε) and penetration depth (λ). The results of analysis based on the data of Tc, ε, and λ from the samples of BSCCO-2212 and YBCO-123 single crystals show that B*>Bc1 and T*<Tc with Tc-T* ranging from 0.13K to 0.28K for BSCCO-2212 and 0.05 to 0.06 for Y-123 samples, while the value of B* spans the range of 0.35G – 0.7G and 0.40G – 0.45G for BSCCO-2212 and YBCO-123 respectively. It is emphasized however, that the results obtained are strongly depend on the choices of Lindemann constant cL and Ginzburg parameter G.
Co-Authors D. Ulfaty M. Diantoro W. Loeksmanto