| Автор | de la Cruz, Clarina |
| Автор | Huang, Q. |
| Автор | Lynn, J. W. |
| Автор | Li, Jiying |
| Автор | II, W. Ratcliff |
| Автор | Zarestky, J. L. |
| Автор | Mook, H. A. |
| Автор | Chen, G. F. |
| Автор | Luo, J. L. |
| Автор | Wang, N. L. |
| Автор | Dai, Pengcheng |
| Дата выпуска | 2008 |
| dc.description | Following the discovery of long-range antiferromagnetic order in the parent compounds of high-transition-temperature (high-Tc) copper oxides, there have been efforts to understand the role of magnetism in the superconductivity that occurs when mobile â electronsâ or â holesâ are doped into the antiferromagnetic parent compounds. Superconductivity in the newly discovered rare-earth iron-based oxide systems ROFeAs (R, rare-earth metal) also arises from either electron or hole doping of their non-superconducting parent compounds. The parent material LaOFeAs is metallic but shows anomalies near 150â K in both resistivity and d.c. magnetic susceptibility. Although optical conductivity and theoretical calculations suggest that LaOFeAs exhibits a spin-density-wave (SDW) instability that is suppressed by doping with electrons to induce superconductivity, there has been no direct evidence of SDW order. Here we report neutron-scattering experiments that demonstrate that LaOFeAs undergoes an abrupt structural distortion below 155â K, changing the symmetry from tetragonal (space group P4/nmm) to monoclinic (space group P112/n) at low temperatures, and then, at â ¼137â K, develops long-range SDW-type antiferromagnetic order with a small moment but simple magnetic structure. Doping the system with fluorine suppresses both the magnetic order and the structural distortion in favour of superconductivity. Therefore, like high-Tc copper oxides, the superconducting regime in these iron-based materials occurs in close proximity to a long-range-ordered antiferromagnetic ground state. |
| Формат | application.pdf |
| Издатель | Nature Publishing Group |
| Копирайт | Nature Publishing Group |
| Название | Magnetic order close to superconductivity in the iron-based layered LaO1-xFxFeAs systems |
| Тип | LETTERS TO NATURE |
| DOI | 10.1038/nature07057 |
| Print ISSN | 0028-0836 |
| Журнал | Nature |
| Том | 453 |
| Первая страница | 899 |
| Последняя страница | 902 |
| Аффилиация | de la Cruz, Clarina; Department of Physics and Astronomy, The University of Tennessee, Knoxville, Tennessee 37996-1200, USA; Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA |
| Аффилиация | Huang, Q.; NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899-6102, USA |
| Аффилиация | Lynn, J. W.; NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899-6102, USA |
| Аффилиация | Li, Jiying; NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899-6102, USA; Department of Materials Science and Engineering, University of Maryland, College Park, Maryland 20742-6393, USA |
| Аффилиация | II, W. Ratcliff; NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899-6102, USA |
| Аффилиация | Zarestky, J. L.; Ames Laboratory and Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA |
| Аффилиация | Mook, H. A.; Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA |
| Аффилиация | Chen, G. F.; Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China |
| Аффилиация | Luo, J. L.; Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China |
| Аффилиация | Wang, N. L.; Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China |
| Аффилиация | Dai, Pengcheng; Department of Physics and Astronomy, The University of Tennessee, Knoxville, Tennessee 37996-1200, USA; Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA |
| Выпуск | 7197 |
