In Search for Novel Sn2Co3S2-based Half-metal Ferromagnets

2014 ◽  
Vol 69 (1) ◽  
pp. 55-61 ◽  
Author(s):  
Florian Pielnhofer ◽  
Amadeus Samuel Tragl ◽  
Jan Rothballer ◽  
Richard Weihrich
Keyword(s):  
Density Functional ◽  
Substitution Effects ◽  
The Novel ◽  
Functional Theory ◽  
Half Metallic ◽  
Half Metal ◽  
Spin Polarized ◽  
Densities Of States ◽  
Metallic Ferromagnet ◽  
The Stability

Substitution effects on magnetism of shandite-type compounds have been studied by density functional theory. The decrease of the Fermi level in the novel half-metallic ferromagnet Sn2Co3S2 to higher maxima of the density of states was modeled for substitutions on the Co site by the 3d metals Fe, Mn and Cr due to a rigid band scheme. Spin-polarized energy hyper surfaces and densities of states are calculated for Sn2Co3S2, and experimentally not yet known Sn2Fe3S2, Sn2Mn3S2 and Sn2Cr3S2 with shandite-type structure. The stability of half-metallic ferromagnetic characteristics, Slater-Pauling behavior, and alternative metastable spin states are discussed.

Targeting complex plutonium oxides by combining crystal chemical reasoning with density-functional theory calculations: the quaternary plutonium oxide Cs2PuSi6O15

2020 ◽  
Vol 56 (66) ◽  
pp. 9501-9504
Author(s):  
Kristen A. Pace ◽  
Vladislav V. Klepov ◽  
Matthew S. Christian ◽  
Gregory Morrison ◽  
Travis K. Deason ◽  
...  
Keyword(s):  
Density Functional Theory ◽  
Crystal Growth ◽  
Dft Calculations ◽  
Density Functional ◽  
Density Functional Theory Calculations ◽  
Crystal Chemical ◽  
The Novel ◽  
Functional Theory ◽  
The Stability ◽  
Chemical Reasoning

The stability of the novel Pu(iv) silicate, Cs2PuSi6O15, was predicted from a combination of crystal chemical reasoning and DFT calculations and confirmed by its synthesis via flux crystal growth.

Theoretical investigation of the electronic and thermoelectric behavior of CoV2O4 alloy

2019 ◽  
Vol 08 (02) ◽  
pp. 1950008
Author(s):  
Mahmoud Al-Elaimi ◽  
Farida Hamioud ◽  
G. I. Ameereh ◽  
A. A. Mubarak
Keyword(s):  
Thermoelectric Properties ◽  
Ground State ◽  
Density Functional ◽  
Charge Carriers ◽  
Functional Theory ◽  
Half Metallic ◽  
Text Type ◽  
Present Alloy ◽  
Metallic Ferromagnet ◽  
Sound Velocities

Density functional theory (DFT) within Wien2k code is utilized to compute the mechanical, thermal, electronic, magnetic and thermoelectric properties of the cubic spinel CoV2O4. The ground state lattice constant of CoV2O4 alloy agrees with previous literature. The calculated elastic constants of CoV2O4 predict that the present alloy is anisotropic, elastically stable and brittle. Beneficial acoustical applications are expected for the present alloy due to its high calculated Debye temperature and average sound velocities values. The longitudinal and transverse sound velocities modes of vibrations are found maximum along [110] directions compared to [100] and [111] directions. The calculated DOS and band structure show that CoV2O4 is electronically stable. The present alloy possesses a total magnetic moment of 12.0 [Formula: see text] and is classified as a half-metallic ferromagnet. CoV2O4 shows [Formula: see text]-type behavior and favors holes as charge carriers. The present alloy owns beneficial thermoelectric properties and can be used in thermoelectric applications.

scholarly journals Ferromagnetic Half-Metal Cyanamides Cr(NCN)2 Predicted from First Principles Investigation

Materials ◽  
2020 ◽  
Vol 13 (8) ◽  
pp. 1805
Author(s):  
Zhilue Wang ◽  
Shoujiang Qu ◽  
Hongping Xiang ◽  
Zhangzhen He ◽  
Jun Shen
Keyword(s):  
First Principles ◽  
Electronic Structures ◽  
Density Functional ◽  
Magnetic Moments ◽  
Electronic Correlation ◽  
Functional Theory ◽  
Half Metal ◽  
Equivalent Site ◽  
Magnetic Couplings ◽  
The Stability

The stability, physical properties, and electronic structures of Cr(NCN)2 were studied using density functional theory with explicit electronic correlation (GGA+U). The calculated results indicate that Cr(NCN)2 is a ferromagnetic and half-metal, both thermodynamically and elastically stable. A comparative study on the electronic structures of Cr(NCN)2 and CrO2 shows that the Cr atoms in both compounds are in one crystallographically equivalent site, with an ideal 4+ valence state. In CrO2, the Cr atoms at the corner and center sites have different magnetic moments and orbital occupancies, moreover, there is a large difference between the intra- (12.1 meV) and inter-chain (31.2 meV) magnetic couplings, which is significantly weakened by C atoms in Cr(NCN)2.

Electronic Structure and Half-Metallic Properties of Cubic Perovskite BaRu1-XTixO3 System

2012 ◽  
Vol 519 ◽  
pp. 174-178
Author(s):  
Tong Wei Li ◽  
La Chen ◽  
Yang Wang ◽  
Jin Cang Zhang
Keyword(s):  
Density Functional Theory ◽  
Electronic Structures ◽  
Density Functional ◽  
Energy Gap ◽  
Metallic Phase ◽  
Wave Method ◽  
Functional Theory ◽  
Half Metallic ◽  
Plane Wave Method ◽  
Spin Polarized

The electronic structures of the titanium-doped cubic perovskite ruthenates BaRu1-xTixO3 with x=0.125, 0.25, 0.375, 0.5, 0.625, 0.75, and 0.875 are investigated using the spin-polarized density functional theory within the pseudopotential plane wave method. It is found that a half-metallic phase appears in the 0.75- and 0.875-doped systems, and the origin of half-metallic property is the decrease of t2g bandwidth of Ru 4d states with the increase in x. In addition, the energy gap of BaRu0.25Ti0.75O3 is as large as 1.7 eV at the Fermi level in the up-spin density of states, which suggests a stable half-metallic phase can be obtained in the present systems.

The Electronic and Magnetic Properties of Chemically Decorated Boron Nitride Sheet

2011 ◽  
Vol 130-134 ◽  
pp. 1439-1443
Author(s):  
Qing Zhou ◽  
Wei Jiang ◽  
An Long Kuang ◽  
Hong Kuan Yuan ◽  
Hong Chen
Keyword(s):  
Magnetic Properties ◽  
Boron Nitride ◽  
Density Functional ◽  
Electronic Devices ◽  
Wide Band ◽  
Functional Theory ◽  
Half Metallic ◽  
Electronic And Magnetic Properties ◽  
Spin Polarized ◽  
Magnetic Transfer

The electronic and magnetic properties of the boron nitride (BN) sheets with different chemical decoration are investigated using the first-principles plane-wave calculations within density functional theory (DFT). It is demonstrated that bare BN sheets are nonmagnetic semiconductors with wide band gaps, and a metallic–semiconducting–half-metallic transition with a nonmagnetic– magnetic transfer can be realized through chemical decoration. Specifically, BN sheets modified by H with zigzag configuration still behave as semiconductors, while with armchair configuration are metallic. Nevertheless, decorating BN sheets by F or OH with zigzag configuration reveal half-metallic properties, then with armchair configuration present spin-polarized semiconducting characteristics. The results may be of importance in designing BN-based electronic devices for nanoelectronic applications.

scholarly journals Spinelectronic investigation of the quaternary vanadium fluoride Rb2NaVF6: Ab-initio method

2020 ◽  
Vol 66 (5 Sept-Oct) ◽  
pp. 604
Author(s):  
M. Berber ◽  
N. Bouzouira ◽  
H. Abid ◽  
A. Boudali ◽  
H. Moujri
Keyword(s):  
Density Functional ◽  
Structural Parameters ◽  
Magnetic Moments ◽  
Generalized Gradient ◽  
Functional Theory ◽  
Half Metallic ◽  
Exchange Correlation ◽  
Spin Polarized ◽  
Higher Temperature ◽  
Good Agreement

In this study, we have investigated the structural, electronic, and magnetic properties of the Rb2NaVF6 compound. We have performed our calculations by the use of first-principle methods based on spin-polarized density functional theory, where the electronic exchange-correlation potential is treated by the generalized gradient approximation GGA- PBEsol coupled with the improved TB-mBJ approach. The calculated structural parameters of Rb2NaVF6 are in good agreement with the available experimental data. Rb2NaVF6 exhibits a half-metallic ferromagnetic feature with a spin polarization of 100 % at the Fermi level and a direct large half-metallic gap of 3.582 eV. The total magnetic moments are 2 μB. This material is half-metallic ferromagnets, and it can be potential candidates for spintronics applications at a higher temperature.

The effect of impurities in ultra-thin hydrogenated silicene and germanene: a first principles study

2015 ◽  
Vol 17 (34) ◽  
pp. 22210-22216 ◽  
Author(s):  
Caroline J. Rupp ◽  
Sudip Chakraborty ◽  
Rajeev Ahuja ◽  
Rogério J. Baierle
Keyword(s):  
Density Functional Theory ◽  
Electronic Properties ◽  
First Principles ◽  
Density Functional ◽  
Functional Theory ◽  
Exchange Correlation ◽  
Spin Polarized ◽  
Effect Of Impurities ◽  
The Stability ◽  
Correlation Term

Spin polarized density functional theory within the GGA–PBE and HSE06 approach for the exchange correlation term has been used to investigate the stability and electronic properties of nitrogen and boron impurities in single layers of silicane and germanane.

scholarly journals Stability of Coinage Metals Interacting with C60

Nanomaterials ◽  
2019 ◽  
Vol 9 (10) ◽  
pp. 1484 ◽  
Author(s):  
Navaratnarajah Kuganathan ◽  
Ratnasothy Srikaran ◽  
Alexander Chroneos
Keyword(s):  
Density Functional Theory ◽  
Electronic Structures ◽  
Density Functional ◽  
Magnetic Moments ◽  
Dispersion Correction ◽  
Functional Theory ◽  
Coinage Metals ◽  
Spin Polarized ◽  
The Stability ◽  
Buckminsterfullerene C60

Buckminsterfullerene (C60) has been advocated as a perfect candidate material for the encapsulation and adsorption of a variety of metals and the resultant metallofullerenes have been considered for the use in different scientific, technological and medical areas. Using spin-polarized density functional theory together with dispersion correction, we examine the stability and electronic structures of endohedral and exohedral complexes formed between coinage metals (Cu, Ag and Au) and both non-defective and defective C60. Encapsulation is exoergic in both forms of C60 and their encapsulation energies are almost the same. Exohedral adsorption of all three metals is stronger than that of endohedral encapsulation in the non-defective C60. Structures and the stability of atoms interacting with an outer surface of a defective C60 are also discussed. As the atoms are stable both inside and outside the C60, the resultant complexes can be of interest in different scientific and medical fields. Furthermore, all complexes exhibit magnetic moments, inferring that they can be used as spintronic materials.

Spin-resolved transport properties in zigzag α-graphyne nanoribbons with symmetric and asymmetric edge fluorinations

RSC Advances ◽  
2016 ◽  
Vol 6 (18) ◽  
pp. 15008-15015 ◽  
Author(s):  
Dan Zhang ◽  
Mengqiu Long ◽  
Xiaojiao Zhang ◽  
Jun Ouyang ◽  
Hui Xu ◽  
...  
Keyword(s):  
Density Functional Theory ◽  
Transport Properties ◽  
Green's Function ◽  
Density Functional ◽  
Function Method ◽  
Functional Theory ◽  
Spin Polarized ◽  
The Stability ◽  
Non Equilibrium Green’S Function ◽  
Non Equilibrium

Using the non-equilibrium Green's function method and spin-polarized density functional theory, we investigate the stability and spin-resolved transport properties of zigzag α-graphyne nanoribbons with symmetric and asymmetric edge fluorinations.

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