Critical current density and magnetic-field irreversibility of Na[sub 0.35]CoO[sub 2]·1.3H[sub 2]O superconductor

Badica, P.; Kondo, T.; Togano, K.
January 2004
Applied Physics Letters;1/26/2004, Vol. 84 Issue 4, p559
Academic Journal
Critical current density J[sub c] of Na[sub 0.35]CoO[sub 2]·1.3H[sub 2]O superconductor (T[sub c]=4.4 K) has been estimated from magnetization measurements: J[sub c](1.9 K,0 T)=5×10[sup 4] A/cm[sup 2], J[sub c] (1.9 K,0.4 T)=4×10[sup 2] A/cm[sup 2] and J[sub c] (3.4 K,0 T)=10[sup 3] A/cm[sup 2]. J[sub c] versus applied magnetic field H cannot be fitted, as for high-T[sub c] superconductors (HTS), by a power law for any temperature. The temperature dependence for a given H is not of the linear type as for MgB[sub 2], but is close to quasiexponential (associated with the thermally activated flux creep) as for HTS. Irreversibility field data points H[sub irr] versus (1-T/T[sub c]) obey a power law with power exponent n=3.4. The irreversibility line is located below, but in vicinity of, the line for Bi-2223. Details of morphology are also presented. © 2004 American Institute of Physics.


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