Resistivity, Hall effect, and anisotropic superconducting coherence lengths of HgBa<inf>2</inf>CaCu<inf>2</inf>O<inf>6</inf>thin films with different morphology
Publication Date
2021Journal Title
Superconductor Science and Technology
ISSN
0953-2048
Publisher
IOP Publishing
Volume
34
Issue
3
Language
en
Type
Article
This Version
VoR
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Richter, H., Lang, W., Peruzzi, M., Hattmansdorfer, H., Durrell, J., & Pedarnig, J. (2021). Resistivity, Hall effect, and anisotropic superconducting coherence lengths of HgBa<inf>2</inf>CaCu<inf>2</inf>O<inf>6</inf>thin films with different morphology. Superconductor Science and Technology, 34 (3) https://doi.org/10.1088/1361-6668/abdedf
Abstract
<jats:title>Abstract</jats:title>
<jats:p>Thin films of the high-temperature superconductor HgBa<jats:sub>2</jats:sub>CaCu<jats:sub>2</jats:sub>O<jats:sub>6</jats:sub> have been prepared on SrTiO<jats:sub>3</jats:sub> 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 <jats:italic>T</jats:italic>
<jats:sub>
<jats:italic>c</jats:italic>
</jats:sub> ∼ 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 <jats:italic>ξ</jats:italic>
<jats:sub>
<jats:italic>ab</jats:italic>
</jats:sub>(0) ∼ 2.3 nm …2.8 nm and out-of-plane <jats:italic>ξ</jats:italic>
<jats:sub>
<jats:italic>c</jats:italic>
</jats:sub>(0) ∼ 0.17 nm …0.24 nm 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.</jats:p>
Keywords
Paper, mercury cuprate, superconductor, resistivity, Hall effect, order parameter fluctuations, coherence length, granular materials
Sponsorship
This work was supported by the Austrian Science Fund under grants I4865-N and P18320-N07 and the COST Actions CA16218 (NANOCOHYBRI) and CA19108 (Hi- SCALE) of the European Cooperation in Science and Technology.
Funder references
European Cooperation in Science and Technology (CA16218, CA19108)
Austrian Science Fund (I4865-N, P-18320-N07)
Identifiers
sustabdedf, abdedf, sust-104243.r1
External DOI: https://doi.org/10.1088/1361-6668/abdedf
This record's URL: https://www.repository.cam.ac.uk/handle/1810/333144
Rights
Licence:
http://creativecommons.org/licenses/by/4.0
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