TY - JOUR
T1 - Chalcogen (O2, S, Se, Te) atmosphere annealing induced bulk superconductivity in Fe1+yTe1- xSex single crystal
AU - Sun, Y.
AU - Tsuchiya, Y.
AU - Yamada, T.
AU - Taen, T.
AU - Pyon, S.
AU - Shi, Z. X.
AU - Tamegai, T.
N1 - Funding Information:
This work was partly supported by the Natural Science Foundation of China, the Ministry of Science and Technology of China (973 project: No. 2011CBA00105 ), and the Japan–China Bilateral Joint Research Project by the Japan Society for the Promotion of Science.
PY - 2014/9/15
Y1 - 2014/9/15
N2 - We reported a detailed study of Fe1+yTe 0.6Se0.4 single crystals annealed in the atmosphere of chalcogens (O2, S, Se, Te). After annealing with appropriate amount of chalcogens, Fe1+yTe0.6Se0.4 single crystals show Tc higher than 14 K with a sharp transition width ∼1 K. Critical current density Jc for the annealed crystals reach a very high value ∼2-4 × 105 A/cm2 under zero field, and is also robust under applied field at low temperatures. Magneto-optical imaging reveal that the Jc is homogeneously distributed in the annealed crystals and isotropic in the ab-plane. Our results show that annealing in the atmosphere of chalcogens can successfully induce bulk superconductivity in Fe1+yTe0.6Se 0.4.
AB - We reported a detailed study of Fe1+yTe 0.6Se0.4 single crystals annealed in the atmosphere of chalcogens (O2, S, Se, Te). After annealing with appropriate amount of chalcogens, Fe1+yTe0.6Se0.4 single crystals show Tc higher than 14 K with a sharp transition width ∼1 K. Critical current density Jc for the annealed crystals reach a very high value ∼2-4 × 105 A/cm2 under zero field, and is also robust under applied field at low temperatures. Magneto-optical imaging reveal that the Jc is homogeneously distributed in the annealed crystals and isotropic in the ab-plane. Our results show that annealing in the atmosphere of chalcogens can successfully induce bulk superconductivity in Fe1+yTe0.6Se 0.4.
KW - Annealing effect
KW - Critical current density
KW - Excess Fe
KW - Iron chalcogenide
KW - Magneto-optical imaging
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U2 - 10.1016/j.physc.2014.02.022
DO - 10.1016/j.physc.2014.02.022
M3 - Article
AN - SCOPUS:84905276066
SN - 0921-4534
VL - 504
SP - 12
EP - 15
JO - Physica C: Superconductivity and its Applications
JF - Physica C: Superconductivity and its Applications
ER -