| Autor: |
Y. B. Qin, He Tian, Y. J. Song, Huaixin Yang, Zhenyu Wang, J. B. Lu, H. L. Shi, J. Q. Li |
| Rok vydání: |
2011 |
| Předmět: |
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| Zdroj: |
Journal of physics. Condensed matter : an Institute of Physics journal. 22(12) |
| ISSN: |
1361-648X |
| Popis: |
The SrFe(2)As(2 - x)P(x) (0.0 ≤ x ≤ 1.0) and CaFe(2)As(2 - y)P(y) (0.0 ≤ y ≤ 0.3) materials were prepared by a solid-state reaction method. X-ray diffraction measurements indicate that the single-phase samples can be successfully obtained for SrFe(2)As(2 - x)P(x) (0.0 ≤ x ≤ 0.8) and CaFe(2)As(2 - y)P(y) (0.0 ≤ y ≤ 0.3). Visible contraction of the lattice parameters is determined due to the relatively smaller radius of P ions in comparison with that of As. The spin-density-wave (SDW) instability associated with the tetragonal to orthorhombic phase transition is suppressed noticeably in both systems following the increase in P content. The highest superconducting transitions are observed at about 27 K in SrFe(2)As(1.3)P(0.7) and at about 13 K in CaFe(2)As(1.925)P(0.075), respectively. Structural analysis suggests that lattice contraction could notably affect the superconductivity in these materials. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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