The Application of CPA to Calculations of the Mean Magnetic Moment in the Gd1-x-,Nix, Gd1-x -,Fex, Gd1-x -,Cox, and Y1-x -,Cox Intermetallic Compounds

1977 ◽  
Vol 82 (1) ◽  
pp. 205-211 ◽  
Author(s):  
B. Szpunar ◽  
K. Kozarzewski
Keyword(s):  
Intermetallic Compounds ◽  
Magnetic Moment ◽  
The Mean

Structure and Magnetic Properties of GdPt2In and GdPt2Sn

2009 ◽  
Vol 64 (2) ◽  
pp. 170-174 ◽  
Author(s):  
Birgit Heying ◽  
Ute Ch. Rodewald ◽  
Wilfried Hermes ◽  
Rainer Pöttgen
Keyword(s):  
Magnetic Properties ◽  
Magnetic Susceptibility ◽  
Single Crystal ◽  
Intermetallic Compounds ◽  
Coordination Number ◽  
Magnetic Moment ◽  
Space Group ◽  
X Ray ◽  
Arc Melting ◽  
Experimental Magnetic Moment

The platinum-rich intermetallic compounds GdPt2In and GdPt2Sn were synthesized by arc-melting of the elements and subsequent annealing. The structures were refined from single crystal X-ray diffractometer data: ZrPt2Al type, space group P63/mmc, a = 455.1(1), c = 899.3(3) pm, wR2 = 0.0361, 166 F2 values, 9 variables for GdPt2In, and a = 453.2(1), c = 906.5(2) pm, wR2 = 0.0915, 166 F2 values, 9 variables for GdPt2Sn. The platinum and indium (tin) atoms build up threedimensional [Pt2In] and [Pt2Sn] networks with short Pt-In (Pt-Sn) distances and Pt2 dumb-bells (290 and 297 pm in GdPt2In and GdPt2Sn). The gadolinium atoms have coordination number 14 with 8 Pt and 6 In (Sn) neighbors. Magnetic susceptibility measurements on GdPt2In show Curie-Weiss behavior with an experimental magnetic moment of 8.06(2) μB/Gd atom. GdPt2In orders ferromagnetically at 27.7(2) K

Influence of Surface Magnetism on the Surface Segregation Near TC in NiX Cu1-x Alloys

1983 ◽  
Vol 21 ◽  
Author(s):  
J. Urias ◽  
J.L. Moran-Lopez
Keyword(s):  
Magnetic Moment ◽  
Surface Segregation ◽  
Mean Field ◽  
Local Environment ◽  
Local Magnetic Moment ◽  
Field Approximation ◽  
Mean Field Approximation ◽  
Surface Magnetism ◽  
Surface Magnetization ◽  
The Mean

ABSTRACTThe influence of surface magnetization on the surface segregation in binary alloys with one magnetic component is studied. Based in a model in which the local magnetic moment on the ferromagnetic atoms is determined by the local environment, the internal energy is calculated within the mean field approximation. We applied the model to dilute CuNi alloys and we find that magnetism favors the segregation of Ni, contrary to what it is found in the paramagnetic phase.

FORMATION OF MAGNETIC MOMENTS IN INTERMETALLIC COMPOUNDS AND ALLOYS

1993 ◽  
Vol 07 (01n03) ◽  
pp. 756-759 ◽  
Author(s):  
T. BEUERLE ◽  
K. HUMMLER ◽  
M. FÄHNLE
Keyword(s):  
Transition Metals ◽  
Ab Initio ◽  
Intermetallic Compounds ◽  
Magnetic Moment ◽  
Nearest Neighbor ◽  
Physical Mechanism ◽  
Magnetic Moments ◽  
Lmto Method ◽  
Minimum Number ◽  
Alloy Systems

Jaccarino and Walker proposed that in certain alloy systems a considered kind of atom attains a constant value of the magnetic moment if it is surrounded by at least a minimum number of nearest-neighbor atoms of a certain kind, and that it is nonmagnetic otherwise. It is shown by ab initio supercell calculations within the LMTO method that the system Nbi−xMox with 1% iron approximately fulfills the Jaccarino-Walker hypothesis, whereas the alloy FexRh1−x does not. The physical mechanism for the destruction of the Fe moment in bcc alloys with 4d and 5d transition metals is elucidated.

scholarly journals The Electrodynamics of Neutrinos in Dispersive Media

1990 ◽  
Vol 142 ◽  
pp. 35-38
Author(s):  
V.N. Oraevsky ◽  
V.B. Semikoz
Keyword(s):  
Magnetic Field ◽  
External Magnetic Field ◽  
Charge Distribution ◽  
Magnetic Moment ◽  
Anomalous Magnetic Moment ◽  
Dispersive Media ◽  
Mean Square ◽  
Vector Bosons ◽  
Electromagnetic Characteristics ◽  
The Mean

Neutrinos interacting with the vacuum of vector bosons and leptons possess important vacuum electromagnetic characteristics: viz., the anomalous magnetic moment Δμvacν and the mean-square radius of charge distribution <r2>1/2. As a result, neutrinos, just like neutrons, may interact with an external magnetic field.

scholarly journals A Quantum Charged Particle under Sudden Jumps of the Magnetic Field and Shape of Non-Circular Solenoids

2019 ◽  
Vol 1 (2) ◽  
pp. 193-207 ◽  
Author(s):  
Viktor V. Dodonov ◽  
Matheus B. Horovits
Keyword(s):  
Magnetic Field ◽  
Charged Particle ◽  
Magnetic Fields ◽  
Electric Fields ◽  
Cross Sections ◽  
Magnetic Moment ◽  
Landau Gauge ◽  
Time Dependent ◽  
The Mean ◽  
The Magnetic Field

We consider a quantum charged particle moving in the x y plane under the action of a time-dependent magnetic field described by means of the linear vector potential of the form A = B ( t ) − y ( 1 + β ) , x ( 1 − β ) / 2 . Such potentials with β ≠ 0 exist inside infinite solenoids with non-circular cross sections. The systems with different values of β are not equivalent for nonstationary magnetic fields or time-dependent parameters β ( t ) , due to different structures of induced electric fields. Using the approximation of the stepwise variations of parameters, we obtain explicit formulas describing the change of the mean energy and magnetic moment. The generation of squeezing with respect to the relative and guiding center coordinates is also studied. The change of magnetic moment can be twice bigger for the Landau gauge than for the circular gauge, and this change can happen without any change of the angular momentum. A strong amplification of the magnetic moment can happen even for rapidly decreasing magnetic fields.

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