Direct Current Measurement of Hall Effect in the Mixed State for the Iron-chalcogenide Superconductors

In order to investigate how the composition and the pinning affect the behavior of the Hall effect in the mixed state, we measure the Hall resistivity for iron-chalcogenide superconductor FeSe1−xTex films near the superconducting transition temperature. We observe a sign change of the Hall resistivi...

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Bibliographic Details
Published in:Journal of physics. Conference series 2018-07, Vol.1054 (1), p.12021
Main Authors: Ogawa, R., Ishikawa, T., Kawai, M., Nabeshima, F., Maeda, A.
Format: Article
Language:English
Subjects:
Chalcogenides
Direct current
Electrical resistivity
Electromagnetism
Hall effect
Iron
Physics
Pinning
Scaling laws
Superconductors
Transition temperature
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Summary:In order to investigate how the composition and the pinning affect the behavior of the Hall effect in the mixed state, we measure the Hall resistivity for iron-chalcogenide superconductor FeSe1−xTex films near the superconducting transition temperature. We observe a sign change of the Hall resistivity in FeSe0.5Te0.5 (x = 0.5) films, but FeSe0.8Te0.2 (x = 0.2) films do not show the sign reversal. Increasing applying current density, the sign change of the Hall resistivity in the film with x = 0.5 disappeared. We evaluated the strength of the pinning in samples from an activation energy and a scaling law, and found that the film with x = 0.5 has the stronger pinning than that of the film with x = 0.2. All of those results suggest that the pinning has related to the Hall resistivity anomaly in Fe chalcogenides.
ISSN:1742-6588
1742-6596
DOI:10.1088/1742-6596/1054/1/012021