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Resistivity, Hall effect, and anisotropic superconducting coherence lengths of HgBa2CaCu2O6thin films with different morphology

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Richter, H 
Peruzzi, M 
Hattmansdorfer, H 


jats:titleAbstract</jats:title> jats:pThin films of the high-temperature superconductor HgBajats:sub2</jats:sub>CaCujats:sub2</jats:sub>Ojats:sub6</jats:sub> have been prepared on SrTiOjats:sub3</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:italicT</jats:italic> jats:sub jats:italicc</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:italicξ</jats:italic> jats:sub jats:italicab</jats:italic> </jats:sub>(0) ∼ 2.3 nm …2.8 nm and out-of-plane jats:italicξ</jats:italic> jats:sub jats:italicc</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>



mercury cuprate, superconductor, resistivity, Hall effect, order parameter fluctuations, coherence length, granular materials

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Superconductor Science and Technology

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IOP Publishing
European Cooperation in Science and Technology (CA16218, CA19108)
Austrian Science Fund (I4865-N, P-18320-N07)
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.