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Siebeneichler S, Ovchinnikov A, Bosch-Santos B, Cabrera-Pasca GA, Flacau R, Huang Q, Carbonari AW, Ryan D, Mudring AV. Magnetic phase diagram of the solid solution LaMn 2(Ge 1-xSi x) 2 (0 ≤ x ≤ 1) unraveled by powder neutron diffraction. Sci Rep 2022; 12:9248. [PMID: 35665754 DOI: 10.1038/s41598-022-12549-y] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2022] [Accepted: 05/03/2022] [Indexed: 11/12/2022] Open
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.
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Md Din MF, Wang JL, Cheng ZX, Dou SX, Kennedy SJ, Avdeev M, Campbell SJ. Tuneable Magnetic Phase Transitions in Layered CeMn2Ge(2-x)Six Compounds. Sci Rep 2015; 5:11288. [PMID: 26090940 PMCID: PMC4650650 DOI: 10.1038/srep11288] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2014] [Accepted: 05/12/2015] [Indexed: 11/20/2022] Open
Abstract
The structural and magnetic properties of seven CeMn2Ge(2-x)Six compounds with x = 0.0-2.0 have been investigated in detail. Substitution of Ge with Si leads to a monotonic decrease of both a and c along with concomitant contraction of the unit cell volume and significant modifications of the magnetic states - a crossover from ferromagnetism at room temperature for Ge-rich compounds to antiferromagnetism for Si-rich compounds. The magnetic phase diagram has been constructed over the full range of CeMn2Ge(2-x)Six compositions and co-existence of ferromagnetism and antiferromagnetism has been observed in CeMn2Ge1.2Si0.8, CeMn2Ge1.0Si1.0 and CeMn2Ge0.8Si1.2 with novel insight provided by high resolution neutron and X-ray synchrotron radiation studies. CeMn2Ge(2-x)Six compounds (x = 0, 0.4 and 0.8) exhibit moderate isothermal magnetic entropy accompanied with a second-order phase transition around room temperature. Analysis of critical behaviour in the vicinity of TC(inter) for CeMn2Ge2 compound indicates behaviour consistent with three-dimensional Heisenberg model predictions.
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Affiliation(s)
- M. F. Md Din
- Institute for Superconductivity and Electronic Materials, University of Wollongong, Wollongong, NSW 2522, Australia
- Department of Electrical & Electronic Engineering, Faculty of Engineering, National Defence University of Malaysia, Kem Sungai Besi, 57000 Kuala Lumpur, Malaysia
| | - J. L. Wang
- Institute for Superconductivity and Electronic Materials, University of Wollongong, Wollongong, NSW 2522, Australia
- Bragg Institute, Australian Nuclear Science and Technology Organization, Lucas Heights, NSW 2234, Australia
| | - Z. X. Cheng
- Institute for Superconductivity and Electronic Materials, University of Wollongong, Wollongong, NSW 2522, Australia
| | - S. X. Dou
- Institute for Superconductivity and Electronic Materials, University of Wollongong, Wollongong, NSW 2522, Australia
| | - S. J. Kennedy
- Bragg Institute, Australian Nuclear Science and Technology Organization, Lucas Heights, NSW 2234, Australia
| | - M. Avdeev
- Bragg Institute, Australian Nuclear Science and Technology Organization, Lucas Heights, NSW 2234, Australia
| | - S. J. Campbell
- School of Physical, Environmental and Mathematical Sciences, The University of New South Wales, Canberra, ACT 2600, Australia
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