کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1592121 | 1515623 | 2013 | 4 صفحه PDF | دانلود رایگان |

• The hexagonal FeSe0.9Br0.1 and tetragonal FeSe1−xBrx (x=0.18, 0.2, 0.3) were made.
• This means that the crystal structure in FeSe1−xBrx is dependent on the amount of Br.
• Magnetic measurements show the superconducting Tc~5 K in FeSe0.8Br0.2.
Our experimental data indicate that the crystal structure formation in FeSe1−xBrx is dependent on the amount of Br. For the samples with x between 0.18 and 0.3, the single tetragonal β-FeSe phase with space group P4/nmm could be obtained by carrying out the low-temperature (400 °C) annealing after reaction at 680 °C. As to the sample with x=0.1, a heat firing at 680 °C is in favor of forming single hexagonal δ-FeSe phase with space group P63/mmc. The compound FeSe0.9Br0.1 with single δ hexagonal NiAs-type phase shows neither magnetic order nor superconductivity above 1.8 K according to dc magnetization measurements while the bulk character of the superconducting state with a Tc around 5 K for the single β tetragonal PbO-type phase in FeSe1−xBrx is confirmed. Larger superconducting volume fraction appears in the single-phase sample with x near 0.2.
Journal: Solid State Communications - Volume 172, October 2013, Pages 1–4