Magnetic phase diagram of the solid solution LaMn2(Ge1-xSix)(2) (0 <= x <= 1) unraveled by powder neutron diffraction

Author(s)

Siebeneichler, Stefanie ; Ovchinnikov, Alexander ; Bosch-Santos, Brianna ; Cabrera-Pasca, Gabriel A. ; Flacau, Roxana ; Huang, Qingzhen ; Carbonari, Artur W. ; Ryan, Dominic ; Mudring, Anja-Verena

• Document type: Journal article
• Source: SCIENTIFIC REPORTS; v. 12, n. 1, p. 16-pg., 2022-06-03.

Abstract

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. (AU)

• FAPESP's process: 13/05552-1 - Investigation of hyperfine interactions in Ce(PdxRh1-X)2Si2; CexGd1-xRh2Si2, PrxGd1-xRh2Si2 and NdxGd1-xRh2Si2 intermetallic compounds by perturbed angular correlation spectrocopy
• Grantee: Gabriel Adolfo Cabrera Pasca
• Support Opportunities: Scholarships abroad - Research Internship - Post-doctor
• FAPESP's process: 12/11104-9 - Atomic scale investigation of high-dielectric-constant nano-structured semiconductor oxides by means of a nuclear technique
• Grantee: Artur Wilson Carbonari
• Support Opportunities: Regular Research Grants