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Abstract
We report the comparative studies of unidirectional columnar defects and isotropic columnar defects in Bi 2Sr 2CaCu 2O 8 single crystals. Both types of the columnar defects induce significant enhancements of the irreversibility line and the activation energy. We find the good scalings of the irreversibility lines and the activation energies using the effective matching fields. For the case of isotropic columnar defects, the effective matching field has a large renormalization effect.
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