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High-pressure studies on Tc and crystal structure of iron chalcogenide superconductors
Hiroki Takahashi1, Takahiro Tomita1, Hiroyuki Takahashi2
1College of Humanities and Sciences, Nihon University, Setagaya, Tokyo 156-8550, Japan; Transformative Research-Project on Iron Pnictides (TRIP), Japan Science and Technology Agency (JST), Chiyoda, Tokyo 102-0075, Japan.
Abstract:
The superconducting transition temperature, Tc, in iron-based solids can be enhanced by applied pressure: Tc increases from 8 to 37 K for the 11-type FeSe when the pressure is raised from 0 to 4 GPa. High-pressure studies can elucidate the mechanism of superconductivity in such novel materials. In this paper, we present a high-pressure study of Fe(Se1- Te ) and Fe(Se1- S ). In the case of Fe(Se1- Te ), the maximum Tc under high pressure did not exceed the Tc of FeSe, which can be attributed to the structural transition to the monoclinic phase. For Fe(Se1- S ) (0 < x < 0.3), Tc exhibited a significant increase with pressure; however, the maximum Tc under high pressure did not exceed the Tc of FeSe. This may be due to the disorder induced by substituting S for Se, which is similar to the pressure effect on Tc for the 1111-type superconductor Ca(Fe1- Co )AsF. The Tc of Fe(Se1- S ) showed a complex behavior below 1 GPa, first decreasing and then increasing with increasing pressure. From high-pressure x-ray diffraction measurements, the Tc (P) curve was correlated with the local structural parameter.
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