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Pressure-restored superconductivity in Cu-substituted FeSe

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Zitation

Schoop, L. M., Medvedev, S. A., Ksenofontov, V., Williams, A., Palasyuk, T., Troyan, I. A., et al. (2011). Pressure-restored superconductivity in Cu-substituted FeSe. Physical Review B, 84(17): 174505, pp. 1-4. doi:10.1103/PhysRevB.84.174505.


Zitierlink: http://hdl.handle.net/11858/00-001M-0000-0018-B572-3
Zusammenfassung
Copper doping of FeSe destroys its superconductivity at ambient pressure, even at low doping levels. Here we report the pressure-dependent transport and structural properties of Fe(1.01-x) Cu(x) Se with 3% and 4% Cu doping and find that the superconductivity is restored. Metallic resistivity behavior, absent in Cu-doped FeSe, is also restored. At the low pressure of 1.5 GPa, superconductivity is seen at 6 K for 4% Cu doping, somewhat lower than the 8 K T(c) of undoped FeSe. T(c) reaches its maximum of 31.3 K at 7.8 GPa, lower than the maximum superconducting temperature in the undoped material under pressure (T(c) max of 37 K) but still very high. X-ray diffraction shows that applied pressure decreases the lattice parameter in the basal plane, counteracting the structural effect of Cu doping, providing a possible explanation for the restoration of the superconductivity.