抄録
We present the complete superconducting upper critical field (H c2) - temperature (T) diagram of FeTeS films measured at three crystalline orientations (H ∥ c, 45° and ab). We find that Hc2 is almost isotropic in magnetic field orientation with μ0Hc2 (T = 0) ∼ 30 T and a transition temperature of Tc ∼ 7 K. A small but clear Hc2 angular anisotropy is observed, with a crossover around T = 0.7Tc, from Hc2 (∥ c) < Hc2 (∥ ab) for T > 0.7Tc to H c2 (∥ c) > Hc2 (∥ ab) for T < 0.7T c. This change in the anisotropy is similar to that observed in FeTeS and FeTeSe single crystals but occurs at a higher T/Tc for our film. We analyze the Hc2 (T) in terms of pair-breaking mechanisms and two-band superconductor theory. Understanding the inversion of Hc2 opens the possibility to adjust the effective anisotropy of superconductors for different applications.
本文言語 | English |
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論文番号 | 044005 |
ジャーナル | Superconductor Science and Technology |
巻 | 27 |
号 | 4 |
DOI | |
出版ステータス | Published - 2014 4月 |
外部発表 | はい |
ASJC Scopus subject areas
- セラミックおよび複合材料
- 凝縮系物理学
- 金属および合金
- 電子工学および電気工学
- 材料化学