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Ullah H, Yasin S, Safeen K, Younus A, El-Bahy ZM, Safeen A, Abdou SN, Ibrahim MM. First principle study of scandium-based novel ternary half Heusler ScXGe (X = Mn and Fe) alloys: insight into the spin-polarized structural, electronic, and magnetic properties. RSC Adv 2024; 14:13605-13617. [PMID: 38665498 PMCID: PMC11043918 DOI: 10.1039/d4ra00811a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2024] [Accepted: 04/09/2024] [Indexed: 04/28/2024] Open
Abstract
The structural, electronic, and magnetic properties of novel half-Heusler alloys ScXGe (X = Mn, Fe) are investigated using the first principle full potential linearized augmented plane wave approach based on density functional theory (DFT). To attain the desired outcomes, we employed the exchange-correlation frameworks, specifically the local density approximation in combination with Perdew, Burke, and Ernzerhof's generalized gradient approximation plus the Hubbard U parameter method (GGA + U) to highlight the strong exchange-correlation interaction in these alloys. The structural parameter optimizations, whether ferromagnetic (FM) or nonmagnetic (NM), reveal that all ScXGe (where X = Mn, Fe) Heusler alloys attain their lowest ground state energy during FM optimization. The examination of the electronic properties of these alloys reveals their metallic character in both the spin-up and spin-down channels. The projected densities of states indicate that bonding is achieved through the hybridization of p-d and d-d states in all of the compounds. The investigation of the magnetic properties in ScXGe (where X = Mn, Fe) compounds indicates pronounced stability in their ferromagnetic state. Notably, the Curie temperatures for ScXGe (X = Mn, Fe) are determined to be 2177.02 K and 1656.09 K, respectively. The observation of metallic behavior and the strong ferromagnetic characteristics in ScXGe (X = Mn, Fe) half-Heusler alloys underscores their potential significance in the realm of spintronic devices. Consequently, our study serves as a robust foundation for subsequent experimental validation.
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Affiliation(s)
- Hayat Ullah
- Material Modeling and Simulation Lab, Department of Physics, Women University of Azad Jammu & Kashmir Bagh Pakistan
| | - Sadia Yasin
- Material Modeling and Simulation Lab, Department of Physics, Women University of Azad Jammu & Kashmir Bagh Pakistan
| | - Kashif Safeen
- Department of Physics, Abdul Wali Khan University Mardan 23200 Pakistan
| | - Adeel Younus
- Material Modeling and Simulation Lab, Department of Physics, Women University of Azad Jammu & Kashmir Bagh Pakistan
| | - Zeinhom M El-Bahy
- Department of Chemistry, Faculty of Science, Al-Azhar University Nasr City 11884 Cairo Egypt
| | - Akif Safeen
- Department of Physics, University of Poonch Rawalakot, AJK 12350 Pakistan
| | - Safaa N Abdou
- Department of Chemistry, Khurmah University College, Taif University Taif Saudi Arabia
| | - Mohamed M Ibrahim
- Department of Chemistry, College of Science, Taif University P. O. Box 11099 Taif 21944 Saudi Arabia
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Yannello V, Guillou F, Yaroslavtsev AA, Tener ZP, Wilhelm F, Yaresko AN, Molodtsov SL, Scherz A, Rogalev A, Shatruk M. Revisiting Bond Breaking and Making in EuCo 2 P 2 : Where are the Electrons? Chemistry 2019; 25:5865-5869. [PMID: 30714648 DOI: 10.1002/chem.201900244] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2019] [Indexed: 11/12/2022]
Abstract
X-ray absorption spectroscopy (XAS) was used to elucidate changes in the electronic structure caused by the pressure-induced structural collapse in EuCo2 P2 . The spectral changes observed at the L3 -edge of Eu and K-edges of Co and P suggest electron density redistribution, which contradicts the formal charges calculated from the commonly used Zintl-Klemm concept. Quantum-chemical calculations show that, despite the increase in the oxidation state of Eu and the formation of a weak P-P bond in the high-pressure phase, the electron transfer from the Eu 4f orbitals to the hybridized 5d and 6s states causes strengthening of the Eu-P and P-P bonds. These changes explain the increased electron density on P atoms, deduced from the P K-edge XAS spectra. This work shows that the formal electron counting schemes do not provide an adequate description of changes associated with phase transitions in metallic systems with substantial mixing of the electronic states.
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Affiliation(s)
- Vincent Yannello
- Department of Chemistry and Biochemistry, Florida State University, 95 Chieftan Way, Tallahassee, FL, 32306, USA
| | - Francois Guillou
- ESRF-The European Synchrotron, 71 Avenue des Martyrs, 38000, Grenoble, France.,Present address: Inner Mongolia Key Laboratory for Physics, and Chemistry of Functional Materials, Inner Mongolia Normal University, No 81 Zhaowuda Road, Hohhot, P. R. China
| | - Alexander A Yaroslavtsev
- European XFEL GmbH, Holzkoppel 4, 22869, Schenefeld, Germany.,National Research Nuclear University "MEPhI", Kashirskoe shosse 31, 115409, Moscow, Russia
| | - Zachary P Tener
- Department of Chemistry and Biochemistry, Florida State University, 95 Chieftan Way, Tallahassee, FL, 32306, USA
| | - Fabrice Wilhelm
- ESRF-The European Synchrotron, 71 Avenue des Martyrs, 38000, Grenoble, France
| | - Alexander N Yaresko
- Max-Planck-Institut für Festkörperforschung, Heisenbergstraße 1, 70569, Stuttgart, Germany
| | - Serguei L Molodtsov
- European XFEL GmbH, Holzkoppel 4, 22869, Schenefeld, Germany.,Institute of Experimental Physics, Technische Universität Bergakademie Freiberg, 09599, Freiberg, Germany.,ITMO University, Kronverkskiy Prospect 49, 197101, St. Petersburg, Russia
| | - Andreas Scherz
- European XFEL GmbH, Holzkoppel 4, 22869, Schenefeld, Germany
| | - Andrei Rogalev
- ESRF-The European Synchrotron, 71 Avenue des Martyrs, 38000, Grenoble, France
| | - Michael Shatruk
- Department of Chemistry and Biochemistry, Florida State University, 95 Chieftan Way, Tallahassee, FL, 32306, USA
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