From (pi, 0) magnetic order to superconductivity with (pi, pi) magnetic resonance in Fe1.02(Te1-xSex)
| Autor: | Liu, T. J., Hu, J., Qian, B., Fobes, D., Mao, Z. Q., Bao, W., Reehuis, M., Kimber, S. A. J., Prokes, K., Matas, S., Argyriou, D. N., Hiess, A., Rotaru, A., Pham, H., Spinu, L., Qiu, Y., Thampy, V., Savici, A. T., Rodriguez, J. A., Broholm, C. |
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| Rok vydání: | 2010 |
| Předmět: | |
| Zdroj: | Nature Materials 9,718-720 (2010) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1038/nmat2800 |
| Popis: | The iron chalcogenide Fe1+y(Te1-xSex) is structurally the simplest of the Fe-based superconductors. Although the Fermi surface is similar to iron pnictides, the parent compound Fe1+yTe exhibits antiferromagnetic order with in-plane magnetic wave-vector (pi, 0). This contrasts the pnictide parent compounds where the magnetic order has an in-plane magnetic wave-vector (pi, pi) that connects hole and electron parts of the Fermi surface. Despite these differences, both the pnictide and chalcogenide Fe-superconductors exhibit superconducting spin resonances around (pi, pi), suggesting a common symmetry for their superconducting order parameter. A central question in this burgeoning field is therefore how (pi, pi) superconductivity can emerge from a (pi, 0) magnetic instability. Here, we report that the magnetic soft mode evolving from the (pi, 0)-type magnetic long-range order is associated with weak charge carrier localization. Bulk superconductivity occurs only as the magnetic mode at (pi, pi) becomes dominant upon doping. Our results suggest a common magnetic origin for superconductivity in iron chalcogenide and pnictide superconductors. Comment: 17 pages, 4 figures |
| Databáze: | arXiv |
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