Abstract
This paper reports the superconducting behavior of the tetragonal iron-chalcogenide superconductor FeSe. The electrical resistivity and the magnetic moment measurements confirmed its superconductivity with Tzero c and Tmag c of 9.4 K under ambient pressure. Electron probe macro analysis indicated that the sample had a stoichiometric Fe:Se ratio of 1:1. The Seebeck coefficient, which was 12.3 μV/K at room temperature, changed to a negative value near 200 K, indicating it to be a two-carrier material. Above Tc, the ρ(T) curve revealed an 'S' shape, and dρ(T)/dT and d2ρ(T)/dT2 showed two anomalous features, one near Tan = 30 K and the other near T* = 110 K. The Seebeck coefficient, S(T), also displays peculiar behavior near the Tan and T*. We also report a rather smaller critical current density, Jc = 102 ~ 104 A/cm2, compared to those observed for the other pnictides and doped chalcogenides.
Original language | English |
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Pages (from-to) | 312-316 |
Number of pages | 5 |
Journal | Journal of the Korean Physical Society |
Volume | 59 |
Issue number | 2 |
DOIs | |
State | Published - 12 Aug 2011 |
Keywords
- Critical current density
- Pseudogap
- Seebeck coefficient
- Superconductivity