Suppressed superconductivity in charge-doped Li(Fe1−xCox)As single crystals
S. Aswartham, G. Behr, L. Harnagea, D. Bombor, A. Bachmann, I. V. Morozov, V. B. Zabolotnyy, A. A. Kordyuk, T. K. Kim, D. V. Evtushinsky, S. V. Borisenko, A. U. B. Wolter, C. Hess, S. Wurmehl, B. Büchner
DOI 10.1103/PhysRevB.84.054534 · Physical Review B
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Abstract
Single crystals of the new unconventional superconductor LiFe1−xCoxAs with x= 0, 0.025, 0.05 were grown by a new approach using the self-flux technique. The superconducting transition temperature was found to decrease upon Co doping at the Fe site. Apparently, in LiFeAs this doping scheme suppresses superconductivity, in contrast to the effects of Co doping in other Fe-As compounds, where it suppresses the spin-density wave and establishes superconductivity. Angle-resolved photoemission spectroscopy shows that the bottom of electron-like bands sinks by about 17 meV upon 5% Co doping, which indicates that the chemical substitution of Co for Fe in LiFeAs results in charge doping.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| LiFeAs Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 16.8 | Pressure not reported | unknown |
| LiFe0.975Co0.025As Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 13.8 | Pressure not reported | unknown |
| LiFe0.95Co0.05As Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 10.8 | Pressure not reported | unknown |
| LiFeAs Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 15.6 | Pressure not reported | zero_resistance |
| LiFe0.975Co0.025As Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 13.4 | Pressure not reported | zero_resistance |
| LiFe0.95Co0.05As Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 11.2 | Pressure not reported | zero_resistance |
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