High pressure study on LaFeAsO with different Tc
| Autor: | Yi, Wei, Zhang, Chao, Sun, Liling, Ren, Zhi-an, Lu, Wei, Dong, Xiaoli, Li, Zhengcai, Che, Guangcan, Yang, Jie, Shen, Xiaoli, Dai, Xi, Fang, Zhong, Zhou, Fang, Zhao, Zhongxian |
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| Rok vydání: | 2008 |
| Předmět: | |
| Zdroj: | EPL, 84 (2008) 67009 |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1209/0295-5075/84/67009 |
| Popis: | We report studies on pressure dependence of superconducting transition temperature (Tc) of LaFeAsO, LaFeAs(O0.5F0.5) and LaFeAs(O0.89F0.11) samples. In-situ resistance measurements under high pressure showed that the Tc of these three compounds increases with pressure initially, reaches a maximum value and then decreases with further increasing pressure, although the Tc at ambient pressure are different. The onset Tc of LaFeAsO is ~50 K at 1.5 GPa, which is the highest record in La-based oxypnicited system. The significant change in Tc induced by pressure is attributed to the orbital degeneracy and the electron density of state at the Fermi level. Comment: 13 pages, 4 figures |
| Databáze: | arXiv |
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