ON MAGNETIC PROPERTIES 0F (TMTSF)2PF6AT AMBIENT PRESSURE

In this research, we report a detailed study of the structural, electrial and magnetic properties of the ruthenium pyrochlore with the composition (Er_2-x Sr_x) Ru_2O_7 0<=x<=0.10 prepared by solid-state reaction in air at ambient pressure. The synthesized products were characterized using powder X-ray diffraction. The structure of the samples was refined with the Rietveld method, showing that the lattice parameters are more sensitive to the Strontium and Erbium sites. Scanning electron microscopy shows that the crystal size varies between 0.27 and 0.62 mu m. In all polycrystalline samples, the electrical resistance decreases with increasing temperature, indicating that the samples are nonmetallic. The slope of the temperature-dependent resistance profiles systematically decreases with increasing x, proving that the carrier concentration increases with increasing the Sr content. Zero-field-cooled and field cooled magnetization measurements show an irreversible behavior where the split is systematically enhanced by increasing x.

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Effects of Ambient Pressure on the Structural and Magnetic Properties of Bismuth Ferrite Nanoparticles Prepared by Pulsed Laser Deposition (PLD)

Materials Science Forum ◽

10.4028/www.scientific.net/msf.722.53 ◽

2012 ◽

Vol 722 ◽

pp. 53-60

Author(s):

Ying Bang Yao ◽

Bei Zhang ◽

Long Chen ◽

Yang Yang

Keyword(s):

Magnetic Properties ◽

Pulsed Laser Deposition ◽

Ambient Pressure ◽

Bismuth Ferrite ◽

Pulsed Laser ◽

Laser Deposition ◽

Ferromagnetic Behavior ◽

Deposition Pressure ◽

Si Substrates ◽

Ambient Oxygen

Nanoparticles of bismuth ferrite (BiFeO3) were fabricated by high-pressure pulsed laser deposition method (PLD) on Pt-coated Si substrates. Effects of the ambient oxygen pressure during deposition (from 1 Torr to 15 Torr) were studied with respect to the microstructures and magnetic properties of the samples. It was found that as the pressure is higher than 5 Torr isolated nanoparticles are formed and the size of these nanoparticles decreases with the deposition pressure. All the nanoparticles exhibit ferromagnetic behavior and the magnetic coercive filed decreases with the particle size.

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The Effect of Pressure on Electronic and Magnetic Properties of MnAs Crystal

Journal of Computational Methods in Physics ◽

10.1155/2013/879164 ◽

2013 ◽

Vol 2013 ◽

pp. 1-6

Author(s):

Farzad Moradiannejad ◽

S. Javad Hashemifar ◽

Hadi Akbarzadeh

Keyword(s):

Magnetic Properties ◽

Density Functional ◽

Ambient Pressure ◽

Full Potential ◽

Zinc Blend ◽

Effect Of Pressure ◽

Electronic And Magnetic Properties ◽

Nuclear Site ◽

Nias Type Structure ◽

Nias Type

The structural, electronic, and magnetic properties of MnAs crystal are studied. The WIEN2k code which uses a full-potential LAPW program based on density functional theory with GGA is used for the calculations. At first, the total energy of a MnAs crystal in different lattices is calculated and the corresponding - diagram is drawn for two different structures of MnAs. The effect of pressuring this crystal is determined. The calculations confirm that, MnAs has the NiAs-type structure at ambient pressure but transforms into the zinc-blend structure of a specific pressure value. Also, the electric field gradient (EFG) and hyperfine field (HFF) at the nuclear site of Mn and As are calculated. Finally, the effect of pressure on EFG and HFF is studied.

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High-pressure Synthesis and Structural, Electrical and Magnetic Properties of a New Filled Skutterudite TbFe4P12

Zeitschrift für Naturforschung B ◽

10.1515/znb-2006-1202 ◽

2006 ◽

Vol 61 (12) ◽

pp. 1471-1476 ◽

Cited By ~ 11

Author(s):

Ichimin Shirotani ◽

Keiki Takeda ◽

Chihiro Sekine ◽

Junichi Hayashi ◽

Ryusuke Nakada ◽

...

Keyword(s):

Magnetic Properties ◽

Magnetic Moment ◽

Ambient Pressure ◽

Magnetic Ordering ◽

Ferromagnetic Transition ◽

X Ray Diffraction ◽

Filled Skutterudite ◽

Electrical And Magnetic Properties ◽

Linear Slope ◽

The Relationship

The new filled skutterudite TbFe4P12 has been prepared at around 4 GPa and 1050 °C. Powder X-ray diffraction of TbT4P12 (T = Fe and Ru) has been studied with synchrotron radiation at ambient pressure. The crystal structures of both compounds were refined by Rietveld methods at ambient pressure. The positional parameters, bond lengths and bond angles have been obtained for TbT4P12 (T = Fe and Ru). The electrical and magnetic properties of TbFe4P12 have been investigated at low temperatures. The susceptibility of this phosphide follows a Curie-Weiss behavior at higher temperatures. The linear slope of the χ−1 vs. T curve from 15 to 300 K yields an effective magnetic moment of 9.48 μB. This value is close to the magnetic moment of the Tb3+ ion calculated from Hund’s rule, 9.72 μB. The ferromagnetic transition of TbFe4P12 was observed at around 10 K, and an electrical anomaly based on the magnetic ordering was detected. The relationship between the crystal structure and the physical properties of TbT4P12 (T = Fe and Ru) is discussed.

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Mechanical Stability, Electronic And Magnetic Properties Of Half- Heusler FeCrAs Alloy For Spintronics Application

Current Science and Technology ◽

10.15282/cst.v1i2.6880 ◽

2021 ◽

Vol 1 (2) ◽

pp. 1-8

Author(s):

Chibueze T. C ◽

Raji A. T ◽

Ezema F. I

Keyword(s):

Magnetic Properties ◽

Magnetic Moment ◽

Density Functional ◽

Mechanical Stability ◽

Ambient Pressure ◽

Functional Materials ◽

Hexagonal Structure ◽

Stable Phase ◽

Material Research ◽

Electronic And Magnetic Properties

The search for functional materials in spintronic devices has become a major component of material research in recent times. The structural, elastic, mechanical, electronic and magnetic properties of half-Heusler FeCrAs alloy (HHFCA) have been examined adopting spin-polarized density functional theory calculations. Our result shows that the hexagonal structure is the high pressure phase of the FeCrAs alloy while the half-Heusler structure is the more stable phase at ambient pressure. Also, the HHFCA is mechanically stable and exhibits half-metallic ferromagnetism besides an indirect band gap in the minority spin channel. The total magnetic moment in one formula unit of the alloy is 1.00 μB, in agreement with the Slater-Pauling rule and the bulk of the magnetic moment contributed by the Cr atoms. Furthermore, high Curie temperature of ~ 1000 K has been obtained for the HHFCA which suggests that it is a promising material for spintronic applications.

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Electronic and magnetic properties of BaUO3 by modified Becke–Johnson (mBJ) functional

Modern Physics Letters B ◽

10.1142/s0217984918501646 ◽

2018 ◽

Vol 32 (15) ◽

pp. 1850164

Author(s):

Ghulam Mustafa ◽

Najm ul Aarifeen ◽

Ahmad Afaq ◽

Muhammad Asif

Keyword(s):

Magnetic Properties ◽

Density Of States ◽

High Performance ◽

Structural Parameters ◽

Ambient Pressure ◽

Magnetic Moments ◽

Ferromagnetic Material ◽

Lattice Parameter ◽

Full Potential ◽

Electronic And Magnetic Properties

First-principle calculations have been performed to study the structural, electronic and magnetic properties of BaUO3 in cubic perovskite. The lattice parameter, bulk modulus, bond length, band structures, density of states, and magnetic moments are evaluated using Full Potential Linearized Augmented Plane Wave (FP-LAPW) method in Wien2k-code with GGA as exchange and correlation functional and mBJ functional is used to improve the results along with GGA+U to review magnetic properties. It is found that our calculated structural parameters are in good agreement with experimental results and other work at ambient pressure. The density of states results for spin up and spin down channels show that BaUO3 is an half ferromagnetic material, so we may use this material to make high-performance spintronics devices.

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Magnetic properties of CrO2 prepared by an ambient pressure TiO2 support assisted synthesis

Journal of Materials Chemistry ◽

10.1039/a906556c ◽

1999 ◽

Vol 9 (11) ◽

pp. 2717-2719 ◽

Cited By ~ 4

Author(s):

R. G. Egdell ◽

E. Brand ◽

D. Kellett

Keyword(s):

Magnetic Properties ◽

Ambient Pressure ◽

Tio2 Support

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