ScholarWorks@숙명여자대학교

초록

We have measured the upper critical field and the irreversibility line of grain-aligned YBa2Cu4O8, with the magnetic field oriented perpendicular to the CuO2 planes. The upper critical field's slope, dH(c2)/dT, is -1.57 T/K, corresponding to a zero-temperature Ginzburg-Landau (GL) coherence length of 19.5 angstrom. The irreversibility line obeys a power-law behavior similar to that of 90-K YBa2Cu3O7-delta. Using the lower-critical-field data, we obtain the zero-temperature magnetic penetration depth lambda(ab)(0) = 1960 angstrom and GL parameter kappa(c) = 100.

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