Evolution of Superconductivity in Fe1+yTe1-xSex Annealed in Te Vapor
Abstract
We report a detailed study of the Te vapor annealing effect in Fe1+yTe0.6Se0.4 single crystals. Bulk superconductivity can be gradually induced by annealing with increasing amount of Te, until the molar ratio of Te to the sample reaches 1 : 10. By further increasing Te molar ratio, superconducting volume is gradually reduced. Resistivity and Hall effect measurements manifest that annealing in Te vapor delocalizes the charge carriers by removing excess Fe. The optimally Te annealed crystal shows homogeneous critical current densities with a large value of ∼4.3 × 105 A/cm2, which proves that the Te annealing is effective to induce bulk superconductivity in Fe1+yTe1-xSex.
- Publication:
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Journal of the Physical Society of Japan
- Pub Date:
- September 2013
- DOI:
- 10.7566/JPSJ.82.093705
- arXiv:
- arXiv:1308.4480
- Bibcode:
- 2013JPSJ...82i3705S
- Keywords:
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- Condensed Matter - Superconductivity
- E-Print:
- 4 pages, 6 figures