GD
G. Doornbos
14 records found
1
The behavior of the superconducting current density j s(B,T) and the dynamical relaxation rate Q(B,T) of YBa2Cu3O7-δ thin films exhibits a number of features typical for strong pinning of vortices by growth induced linear defects. At lo
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The behavior of the superconducting current density (formula presented) and the dynamical relaxation rate (formula presented) of (formula presented) thin films exhibits a number of features typical for strong pinning of vortices by growth induced linear defects. At low magnetic f
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The field dependence of the superconducting current density js(B)and the pinning energy UC(B) in thin films of YBa2Cu3O7-δindicates three different pinning regimes. At low fields, μH < B* ≈ 0.7nd,Φ0s
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Thin films of the high-temperature superconductor YBa2Cu3O(7-δ) exhibit both a large critical current (the superconducting current density generally lies between 10 and 10 A m-2 at 4.2 K in zero magnetic field) and a decrease in such currents with
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We studied the superconducting current density js (B, T) and dynamical relaxation rate Q(B, T) of laser ablated thin films of YBa2Cu3O7-δ with various dislocation densities (ndisl ∼ 7 - 70 μm-2). In these films dislocations act as strong pinning centers like columnar defects in h
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To investigate the quantum tunneling of almost macroscopic vortex segments we measured the normalized relaxation rate Q of superconducting currents for various high- Tc superconductors (HTS’s) down to 100 mK in magnetic fields up to 7 T. At fields below ?0.5 T, Q is essentially i
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In an attempt to clarify the origin of the large critical current densities Jc observed in Laser Ablated and Sputtered YBa2Cu3O7-δ (YBCO) thin films, we make a systematic study of the low temperature Jc in samples carefully analysed using STM and AFM. Jc (B) is determined from to
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Epitaxial YBa2Cu3O7-δ films nucleate in c-axis oriented single-crystalline islands. The surface of the single-crystalline SrTiO3 substrates exhibit steps of one third of the YBa2Cu3O7-δ c-axis. These steps generate a mismatch in the island boundaries between the CuO2 superconduct
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