Lattice-dynamics and in-plane antiferromagnetism in MnxZn1−xPS3 across the entire composition range

作     者：Oliva, Robert Ritov, Esther Horani, Faris Etxebarria, Inĩgo Budniak, Adam K. Amouyal, Yaron Lifshitz, Efrat Guennou, Mael 

作者机构：Department of Physics and Materials Science University of Luxembourg 41 rue du Brill BelvauxL-4422 Luxembourg Schulich Faculty of Chemistry Solid State Institute Russell Berrie Nanotechnology Institute Helen Diller Quantum Center Nancy and Stephen Grand Technion Energy Program Technion−Israel Institute of Technology Haifa3200003 Israel Fisika Saila and EHU Quantum Center Euskal Herriko Unibertsitatea UPV/EHU Sarriena Auzoa z/g Basque Country Leioa48940 Spain Department of Materials Science and Engineering Technion-Israel Institute of Technology Haifa3200003 Israel 

出 版 物：《arXiv》 (arXiv)

年 卷 期：2024年

核心收录：

主　　题：Phonons 

摘      要：Alloyed MnxZn1−xPS3 samples have been grown covering the whole compositional range and studied by means of Raman spectroscopy at temperatures covering from 4K up to 850K. Our results, supported by SQUID magnetic measurements, allowed, from one hand, to complete the magnetic phase diagram of MnxZn1−xPS3 and establish x≥0.3 as the composition at which the alloy retains antiferromagnetism and, from the other hand, to identify the Raman signatures indicative of a magnetic transition. The origin of these Raman signatures is discussed in terms of spin-phonon coupling resulting in the appearance of low- and high-frequency zone-folded phonon modes. For the alloy, an assignment of the 1st and 2nd order modes is provided with the aid of first-principle lattice-dynamical calculations. The compositional dependence of all phonon modes is described and the presence of zone-folded modes is shown to take place for both, the alloy and MnPS3. Finally, a comparison of the Raman spectra of ZnPS3 to other compounds of the transition-metal phosphorous trisulfide family allowed shows that low-frequency phonon peaks exhibit an abnormally large broadening. This is consistent with previous claims on the occurrence of a second-order Jahn-Teller effect that takes place for ZnPS3 and Zn-rich MnxZn1−xPS3 Copyright © 2024, The Authors. All rights reserved.