Exchange interaction and magnetocrystalline anisotropy in GdMn2Ge2 |
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| Affiliation: | 1. School of Materials Science and Engineering, South China University of Technology, Guangzhou 510640, China;2. School of Materials Science and Engineering, Nanyang Technological University, 639798, Singapore;3. Singapore-HUJ Alliance for Research and Enterprise (SHARE), Nanomaterials for Energy and Energy-Water Nexus (NEW), Campus for Research Excellence and Technological Enterprise (CREATE), Singapore 138602, Singapore;1. Univ. Grenoble Alpes, Inst NEEL, F-38042 Grenoble, France;2. CNRS, Inst NEEL, F-38042 Grenoble, France;3. Institute of Physics AS CR, v.v.i., Na Slovance 2, 182 21 Prague 8, Czech Republic;1. Department of Mechanical Engineering, Colorado State University, Fort Collins, CO 80523, United States;2. School of Advanced Materials Discovery, Colorado State University, Fort Collins, CO 80523, United States;3. Department of Chemistry, Colorado State University, Fort Collins, CO 80523, United States;4. Department of Materials Science and Engineering, University of Connecticut, Storrs, CT 06269-3136, United States;5. Institute of Materials Science, University of Connecticut, Storrs, CT 06269-3136, United States;1. Charles University, Faculty of Mathematics and Physics, Department of Condensed Matter Physics, Ke Karlovu 5, 121 16 Prague 2, Czech Republic;2. Charles University, Faculty of Mathematics and Physics, Department of Physics of Materials, Ke Karlovu 5, 121 16 Prague 2, Czech Republic;1. Institute of Physics, PAS, 02-668 Warsaw, Al. Lotników 32/46, Poland;2. Donetsk Institute for Physics and Engineering Named After O.O. Galkin, NАSU, 83114 Donetsk, R. Luxembourg Str. 72, Ukraine;3. Ioffe Physico-Technical Institute RAS, 194021 St. Petersburg, Russia;1. Advanced Material Laboratory (AML), Department of Physics, Sharif University of Technology, 11365-11155 Tehran, Iran;2. Magnet Research Laboratory (MRL), Department of Physics, Sharif University of Technology, 11365-11155 Tehran, Iran;3. Center of Excellence in Complex Systems and Condensed Matter, Sharif University of Technology, 11365-11155 Tehran, Iran |
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| Abstract: | ![]()
Tetragonal GdMn2Ge2 is a ferrimagnet at low temperatures and changes to an antiferromagnet undergoing a first-order transition at 95 K. The temperature dependence of the magnetization has been analyzed in terms of the molecular-field approximation with interactions between Gd-Gd, Gd-Mn and Mn-Mn atoms. The Gd-Mn interaction is antiferromagnetic, and this permits the appearance of the ferrimagnetic structure at low temperatures. The uniaxial anisotropy (the easy axis of magnetization is the c-axis for both Gd and Mn moments) plays an important role in the first-order ferrimagnetic to antiferromagnetic transition. |
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