CUED Publications database

Resistivity, Hall effect, and anisotropic superconducting coherence lengths of HgBa2CaCu2O6 thin films with different morphology

Richter, H and Lang, W and Peruzzi, M and Durrell, J and Hattmansdorfer, H and Pedarnig, JD Resistivity, Hall effect, and anisotropic superconducting coherence lengths of HgBa2CaCu2O6 thin films with different morphology. Superconductor Science and Technology, 34. ISSN 0953-2048 (Unpublished)

Full text not available from this repository.

Abstract

Thin films of the high-temperature superconductor HgBa2CaCu2O6 have been prepared on SrTiO3 substrates by pulsed-laser deposition of precursor films and subsequent annealing in mercury-vapor atmosphere. The microstructural properties of such films can vary considerably and have been analyzed by x-ray analysis and atomic force microscopy. Whereas the resistivity is significantly enhanced in samples with coarse-grained structure, the Hall effect shows little variation. This disparity is discussed based on models for transport properties in granular materials. We find that, despite of the morphological variation, all samples have similar superconducting properties. The critical temperatures Tc ∼ 121.2 K . . . 122.0 K, resistivity, and Hall data indicate that the samples are optimally doped. The analyses of superconducting order parameter fluctuations in zero and finite magnetic fields yield the in-plane ξab(0) ∼ 2.3nm...2.8nm and out-of-plane ξc(0) ∼ 0.17nm...0.24nm Ginzburg- Landau coherence lengths at zero temperature. Hall measurements provide estimates of carrier scattering defects in the normal state and vortex pinning properties in the superconducting state inside the grains.

Item Type: Article
Subjects: UNSPECIFIED
Divisions: Div C > Materials Engineering
Depositing User: Cron Job
Date Deposited: 22 Jan 2021 20:26
Last Modified: 08 Mar 2021 20:06
DOI: 10.1088/1361-6668/abdedf