Cubic, hexagonal and tetragonal FeGex phases (x = 1, 1.5, 2): Raman spectroscopy and magnetic properties

A. Kúkoľová; M. Dimitrievska; A. P. Litvinchuk; S. P. Ramanandan; N. Tappy; H. Menon; M. Borg; D. Grundler; A. Fontcuberta i Morral

doi:10.1039/D1CE00970B

Cubic, hexagonal and tetragonal FeGe_x phases (x = 1, 1.5, 2): Raman spectroscopy and magnetic properties†

A. Kúkoľová,‡^ab M. Dimitrievska,

‡*^a A. P. Litvinchuk,^c S. P. Ramanandan,^a N. Tappy,^a H. Menon,^de M. Borg,

^de D. Grundler

^bf and A. Fontcuberta i Morral

*^ag

Author affiliations

* Corresponding authors

^a Laboratory of Semiconductor Materials, Institute of Materials, School of Engineering, Ecole Polytechnique Fédérale de Lausanne (EPFL), 1015 Lausanne, Switzerland
E-mail: mirjana.dimitrievska@epfl.ch, anna.fontcuberta-morral@epfl.ch

^b Laboratory of Nanoscale Magnetic Materials and Magnonics, Institute of Materials, Ecole Polytechnique Fédérale de Lausanne (EPFL), 1015 Lausanne, Switzerland

^c Texas Center for Superconductivity at UH, Department of Physics, University of Houston, USA

^d Electrical and Information Technology, Lund University, Lund, Sweden

^e NanoLund, Lund University, Lund, Sweden

^f Institute of Electrical and Micro Engineering, School of Engineering, Ecole Polytechnique Fédérale de Lausanne (EPFL), 1015 Lausanne, Switzerland

^g Institute of Physics, School of Basic Sciences, Ecole Polytechnique Fédérale de Lausanne (EPFL), 1015 Lausanne, Switzerland

Abstract

There is currently an emerging drive towards computational materials design and fabrication of predicted novel materials. One of the keys to developing appropriate fabrication methods is determination of the composition and phase. Here we explore the FeGe system and establish reference Raman signatures for the distinction between FeGe hexagonal and cubic structures, as well as FeGe₂ and Fe₂Ge₃ phases. The experimental results are substantiated by first principles lattice dynamics calculations as well as by complementary structural characterization such as transmission electron microscopy and X-ray diffraction, along with magnetic measurements.

This article is part of the themed collection: Supramolecular & Polymorphism

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DOI: https://doi.org/10.1039/D1CE00970B
Article type: Paper
Submitted: 24 jul 2021
Accepted: 20 aug 2021
First published: 20 aug 2021
This article is Open Access

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CrystEngComm, 2021,23, 6506-6517

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Cubic, hexagonal and tetragonal FeGe_x phases (x = 1, 1.5, 2): Raman spectroscopy and magnetic properties

A. Kúkoľová, M. Dimitrievska, A. P. Litvinchuk, S. P. Ramanandan, N. Tappy, H. Menon, M. Borg, D. Grundler and A. Fontcuberta i Morral, CrystEngComm, 2021, 23, 6506 DOI: 10.1039/D1CE00970B

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