Normal state above the upper critical field in Fe1+y Te1-x (Se, S)x
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Contributors
Abstract
We have investigated the magnetotransport above the upper critical field (Hc2) in Fe1.14Te0.7Se0.3, Fe1.02Te0.61Se0.39, Fe1.05Te0.89Se0.11, and Fe1.06Te0.86S0.14. The μSR measurements confirm electronic phase separation in Fe1.06Te0.86S0.14, similar to Fe1+yTe1-xSex. Superconductivity is suppressed in high magnetic fields above 60 T, allowing us to gain insight into the normal-state properties below the zero-field superconducting transition temperature (Tc). We show that the resistivity of Fe1.14Te0.7Se0.3 and Fe1.02Te0.61Se0.39 above Hc2 is metallic as T→0, just like the normal-state resistivity above Tc. On the other hand, the normal-state resistivity in Fe1.05Te0.89Se0.11 and Fe1.06Te0.86S0.14 is nonmetallic down to lowest temperatures, reflecting the superconductor-insulator transition due to electronic phase separation.
Details
Original language | English |
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Article number | 184504 |
Journal | Physical Review B |
Volume | 95 |
Issue number | 18 |
Publication status | Published - 3 May 2017 |
Peer-reviewed | Yes |