| Zdroj: |
Siebeneichler, S, Ovchinnikov, A, Bosch-Santos, B, Cabrera-Pasca, G A, Flacau, R, Huang, Q, Carbonari, A W, Ryan, D & Mudring, A V 2022, ' Magnetic phase diagram of the solid solution LaMn 2 (Ge 1−x Si x ) 2 (0 ≤ x ≤ 1) unraveled by powder neutron diffraction ', Scientific Reports, vol. 12, no. 1, 9248 . https://doi.org/10.1038/s41598-022-12549-y |
| Popis: |
The structural and magnetic properties of the ThCr2Si2-type solid solution LaMn2(Ge1−xSix)2 (x = 0.0 to 1.0) have been investigated employing a combination of X-ray diffraction, magnetization and neutron diffraction measurements, which allowed establishing a magnetic composition-temperature phase diagram. Substitution of Ge by Si leads to a compression of the unit cell, which affects the magnetic exchange interactions. In particular, the magnetic structure of LaMn2(Ge1−xSix)2 is strongly affected by the unit cell parameter c, which is related to the distance between adjacent Mn layers. Commensurate antiferromagnetic layers and a canted ferromagnetic structure dominate the Si-rich part of the solid solution, whilst an incommensurate antiferromagnetic flat spiral and a conical magnetic structure are observed in the Si-poor part. |
