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  Interplay of structure and magnetism in LuFe4Ge2 tuned by hydrostatic pressure

Ajeesh, M. O., Materne, P., Dos Reis, R. D., Weber, K., Dengre, S., Sarkar, R., et al. (2023). Interplay of structure and magnetism in LuFe4Ge2 tuned by hydrostatic pressure. Physical Review B, 107(12): 125136, pp. 1-9. doi:10.1103/PhysRevB.107.125136.

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 Creators:
Ajeesh, M. O.1, Author           
Materne, P.2, Author
Dos Reis, R. D.2, Author
Weber, K.1, Author           
Dengre, S.2, Author
Sarkar, R.2, Author
Khasanov, R.2, Author
Kraft, I.1, Author           
León, A. M.1, Author           
Bi, W.2, Author
Zhao, J.2, Author
Alp, E. E.2, Author
Medvediev, S.3, Author           
Ksenofontov, V.2, Author
Rosner, H.1, Author           
Klauss, H.-H.2, Author
Geibel, C.4, Author           
Nicklas, M.5, Author           
Affiliations:
1Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863462              
2External Organizations, ou_persistent22              
3Sergiy Medvediev, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863438              
4Christoph Geibel, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863465              
5Michael Nicklas, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863472              

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 Abstract: LuFe4Ge2 crystallizes in the ZrFe4Si2-type structure, hosting chains of Fe tetrahedra giving rise to geometric frustration and low dimensionality. The compound orders antiferromagnetically at around 36 K accompanied by a simultaneous structural transition from a tetragonal phase to an orthorhombic phase. The hydrostatic pressure dependence of the magnetic and structural transitions is investigated using electrical transport, AC magnetic susceptibility, AC calorimetry, Mössbauer, muon-spin relaxation (μSR), and x-ray-diffraction measurements. External pressure suppresses the first-order transition to the antiferromagnetic phase (AFM1) around 1.8 GPa. The structural transition is largely unaffected by pressure and remains between 30 to 35 K for pressures up to 2 GPa. A second antiferromagnetic phase (AFM2) is observed at higher pressures. The transition from the paramagnetic to the AFM2 phase is of second-order nature and appears to be connected to the structural transition. The magnetic volume fraction obtained from μSR and Mössbauer measurements reveal that the entire sample undergoes magnetic ordering in both magnetic phases. In addition, similar low-temperature muon-precession frequencies in AFM1 and AFM2 phases point at similar ordered moments and magnetic structures in both phases. Our results further indicate enhanced magnetic fluctuations in the pressure-induced AFM2 phase. The experimental observations together with density functional theory calculations suggest that the magnetic- and structural-order parameters in LuFe4Ge2 are linked by magnetic frustration, causing the simultaneous magnetostructural transition. © 2023 authors. Published by the American Physical Society. Published by the American Physical Society under the terms of the "https://creativecommons.org/licenses/by/4.0/"Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. Open access publication funded by the Max Planck Society.

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Language(s): eng - English
 Dates: 2023-03-162023-03-16
 Publication Status: Issued
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 Rev. Type: -
 Identifiers: DOI: 10.1103/PhysRevB.107.125136
BibTex Citekey: Ajeesh2023
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Title: Physical Review B
  Abbreviation : Phys. Rev. B
Source Genre: Journal
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Publ. Info: Woodbury, NY : American Physical Society
Pages: - Volume / Issue: 107 (12) Sequence Number: 125136 Start / End Page: 1 - 9 Identifier: ISSN: 1098-0121
CoNE: https://pure.mpg.de/cone/journals/resource/954925225008