Atomically imaged crystal structure and normal-state properties of superconducting Ca10Pt4As8((Fe1−xPtx)2As2)5
Zhen Wang, R. Jin, Lijun Wu, Jing Tao, A. B. Karki, J. Y. Pan, Yimei Zhu, E. W. Plummer
DOI 10.1103/PhysRevB.100.094103 · Physical Review B
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Abstract
Superconducting Ca10Pt4As8(Fe2As2)5 is rare because optimal superconducting transition temperature is achieved without chemical doping or pressure. However, the unclear crystal structure limits our ability to understand the structure-property relationship. Using atomically resolved scanning transmission electron microscopy and electron diffraction, we directly determine the structure of this superconductor: it forms a monoclinic structure (space group P21/n) with lattice parameters a=b=8.76Å, c=20.18Å, and γ=90.5∘. Compared with previously reported structures derived from diffraction experiments, the c-lattice constant is doubled due to alternating stacking of Pt4As8 layers, which induces a high density of stacking faults. With the establishment of the crystal structure, stacking faults, and chemical composition, the distinctive normal-state electrical and thermal transport properties of our superconducting Ca10Pt4As8((Fe1−xPtx)2As2)5 (x∼0.05) single crystals can be explained.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Ca10Pt4As8((Fe1-xPtx)2As2)5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 32 | Pressure not reported | onset |
| Ca10Pt4As8((Fe1-xPtx)2As2)5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 32 | Pressure not reported | zero_resistance |
| Ca10Pt4As8(Fe2As2)5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 35 | Pressure not reported | unknown |
| Ca10Pt4As8((Fe0.97Pt0.03)2As2)5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 27 | Pressure not reported | unknown |
| Ca10Pt4As8((Fe0.87Pt0.13)2As2)5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 13 | Pressure not reported | unknown |
| Ca10Pt4As8((Fe0.82Pt0.18)2As2)5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 29 | Pressure not reported | unknown |
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