Simultaneous suppression of superconductivity and structural phase transition under pressure in Ca10(Ir4As8)(Fe2−xIrxAs2)5
Shunsaku Kitagawa, Shingo Araki, Tatsuo C. Kobayashi, Hiroyuki Ishii, Kazunori Fujimura, Daisuke Mitsuoka, Kazutaka Kudo, Minoru Nohara
DOI 10.1103/PhysRevB.90.224513 · Physical Review B
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Abstract
We measured the pressure dependence of in-plane resistivity ρab in the recently discovered iron-based superconductor Ca10(Ir4As8)(Fe2−xIrxAs2)5, which shows a unique structural phase transition in the absence of magnetic ordering, with a superconducting transition temperature Tc=16 K and a structural phase transition temperature Ts≃100 K at ambient pressure. Tc and Ts are suppressed on applying pressure and disappear at approximately 0.5 GPa, suggesting a relationship between superconductivity and structure. Ca10(Ir4As8)(Fe2−xIrxAs2)5 is a rather rare example in which the superconductivity appears only in a low-temperature ordered phase. The fact that the change in the crystal structure is directly linked with superconductivity suggests that the crystal structure as well as magnetism are important factors governing superconductivity in iron pnictides.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Ca10(Ir4As8)(Fe2-xIrxAs2)5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 16 | Pressure unresolved | zero_resistance |
| Ca10(Ir4As8)(Fe2-xIrxAs2)5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 16 | Pressure unresolved | onset |
| Ca10(Pt4As8)(Fe2-xPtxAs2)5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 38 | Pressure not reported | unknown |
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