Abstract
The vortex phases and dynamics of high-temperature and conventional amorphous superconductors are investigated over a broad frequency range. A second-order vortex-solid melting transition in both YBa 2Cu 3O 7 single crystals with random point defects and amorphous Mo 3Si films is manifested by a set of universal critical exponents ( ν≈ 2 3 and z≈3) from both ac and dc transport as well as ac magnetic susceptibility measurements. In contrast, the melting transition in YBa 2Cu 3O 7 single crystals with correlated columnar defects is found to be consistent with a Bose-glass phase transition characterized by a different set of critical exponents ( ν ⊥≈ 1 2 and z′≈4).
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