期刊論文
| 學年 | 112 |
|---|---|
| 學期 | 2 |
| 出版（發表）日期 | 2024-05-07 |
| 作品名稱 | Tunable magnetic structures in the helimagnet YBa(Cu1-xFex)2O5 |
| 作品名稱（其他語言） | |
| 著者 | Chun-Hao Lai; Chin-Wei Wang; Hung-Cheng Wu; Yu-Hui Liang; Andrew J. Studer; Wei-Tin Chen; Chao-Hung Du |
| 單位 | |
| 出版者 | |
| 著錄名稱、卷期、頁數 | Physical Review Materials 8(5), 054404 |
| 摘要 | We report the tunable magnetic structures in the helimagnet YBa(Cu1−𝑥Fe𝑥)2O5 by changing various Cu/Fe ratios. The magnetic properties and structures of the samples were studied by using neutron- and x-ray powder diffraction and susceptibility measurements. The parent material YBaCuFeO5 (YBCFO) exhibits two antiferromagnetic (AFM) transitions at 𝑇𝑁1∼450 K and 𝑇𝑁2∼175 K. At 𝑇𝑁1, YBCFO shows a commensurate (CM) spin ordering with a q-wave vector 𝒌𝒄𝟏=(1/21/21/2), which transfers to a spiral magnetic ordering at 𝑇𝑁2 with an incommensurate 𝑞-wave vector (1/2 1/2 1/2 ±δ), δ being the incommensurability. Using neutron powder diffraction for samples with 0.490≤𝑥≤0.505, 𝑇𝑁2 was observed to systematically increase from 125 to 236 K as a function of the Cu/Fe ratio. For 𝑥=0.510 and 0.515, additional magnetic reflections with a propagation vector 𝒌𝒄𝟐=(1/21/20) appear below 𝑇𝑁3∼245 and 269 K, respectively. This CM phase shows a collinear magnetic ordering. These transition temperatures are consistent with the AFM transitions of the magnetization data. Experiments were also conducted to synthesize the samples with different thermal treatments, demonstrating the 𝑇𝑁2 and 𝑇𝑁3 to be sensitive to the annealing conditions. These results can be understood within the framework of the random distributions of the dopants (impurities) at the 𝐵 site of a double-perovskite lattice and demonstrate that the magnetic ordering in the helimagnet YBCFO can be systematically tuned by changing the Cu/Fe ratio. |
| 關鍵字 | |
| 語言 | en_US |
| ISSN | 2475-9953 |
| 期刊性質 | 國外 |
| 收錄於 | SCI |
| 產學合作 | |
| 通訊作者 | |
| 審稿制度 | 否 |
| 國別 | USA |
| 公開徵稿 | |
| 出版型式 | ,電子版 |
| 相關連結 |
機構典藏連結 ( http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/127579 ) |