| Autor: |
Wang, Chih-Han, Chen, Ta-Kun, Chang, Chung-Chieh, Hsu, Chia-Hao, Lee, Yung-Chi, Wang, Ming-Jye, Wu, Phillip M., Wu, Maw-Kuen |
| Rok vydání: |
2015 |
| Předmět: |
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| Zdroj: |
EPL, 111 (2015) 27004 |
| Druh dokumentu: |
Working Paper |
| DOI: |
10.1209/0295-5075/111/27004 |
| Popis: |
The parent compound of an unconventional superconductor must contain unusual correlated electronic and magnetic properties of its own. In the high-Tc potassium intercalated FeSe, there has been significant debate regarding what the exact parent compound is. Our studies unambiguously show that the Fe-vacancy ordered K2Fe4Se5 is the magnetic, Mott insulating parent compound of the superconducting state. Non-superconducting K2Fe4Se5 becomes a superconductor after high temperature annealing, and the overall picture indicates that superconductivity in K2-xFe4+ySe5 originates from the Fe-vacancy order to disorder transition. Thus, the long pending question whether magnetic and superconducting state are competing or cooperating for cuprate superconductors may also apply to the Fe-chalcogenide superconductors. It is believed that the iron selenides and related compounds will provide essential information to understand the origin of superconductivity in the iron-based superconductors, and possibly to the superconducting cuprates. |
| Databáze: |
arXiv |
| Externí odkaz: |
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