Magnetic phase diagram of the solid solution LaMn2(Ge1−xSix)2 (0≤x≤1) unraveled by powder neutron diffraction
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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.
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SIEBENEICHLER, STEFANIE; OVCHINNIKOV, ALEXANDER; BOSCH-SANTOS, BRIANNA; CABRERA‑PASCA, GABRIEL A.; FLACAU, ROXANA; HUANG, QINGZHEN; CARBONARI, ARTUR W.; RYAN, DOMINIC; MUDRING, ANJA‑VERENA. Magnetic phase diagram of the solid solution LaMn2(Ge1−xSix)2 (0≤x≤1) unraveled by powder neutron diffraction. Scientific Reports, v. 12, n. 1, p. 1-16, 2022. DOI: 10.1038/s41598-022-12549-y. Disponível em: http://repositorio.ipen.br/handle/123456789/33214. Acesso em: 20 Mar 2026.
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