Magnetic and Chemical Ordering in the NiPt and the CoPt Systems

1990 ◽  
Vol 186 ◽  
Author(s):  
J.M. Sanchez ◽  
J.L. MorÁn-LÓpez ◽  
M.C. Cadeville
Keyword(s):  
Experimental Data ◽  
Curie Temperature ◽  
Phase Diagrams ◽  
Statistical Models ◽  
Short Range ◽  
Short Range Order ◽  
Equilibrium Phase ◽  
Experimental Results ◽  
Magnetic Interactions ◽  
Chemical Ordering

AbstractThe interplay between atomic ordering and magnetism in the NiPt and the CoPt systems is investigated theoretically and experimentally. The complete equilibrium phase diagrams are calculated within the framework of statistical models and are compared with experimental data. Experimental results for the Curie temperature, magnetization and paramagnetic susceptibility in ordered and disordered states are satisfactorily reproduced by a Hamiltonian that contains chemical and short-range order dependent magnetic interactions.

PRESSURE-INDUCED STRUCTURAL EFFECTS IN SEMICONDUCTORS

1993 ◽  
Vol 07 (27) ◽  
pp. 4555-4593 ◽  
Author(s):  
J. CRAIN
Keyword(s):  
High Pressure ◽  
Computational Methods ◽  
Short Range ◽  
Short Range Order ◽  
Computational Physics ◽  
Range Order ◽  
Experimental Results ◽  
Structural Effects ◽  
Electronic Effects ◽  
Structural Polymorphism

Recent advances in the understanding of pressure-induced structural and electronic effects in semiconductors have been made possible through developments in both experimental and computational physics. It is shown that the A N B 8−N compounds which include the tetrahedrally coordinated III–V semiconductors exhibit a far richer degree of pressure-induced structural polymorphism than was originally believed. In addition, entirely new factors such as defects, short-range order and irreversibility have been identified as playing potentially important roles in the high pressure behavior of semiconductors. The experimental results are reviewed and discussed in the context of models which are amenable to investigation by modern theoretical and computational methods.

scholarly journals Magnetically driven short-range order can explain anomalous measurements in CrCoNi

2021 ◽  
Vol 118 (13) ◽  
pp. e2020540118
Author(s):  
Flynn Walsh ◽  
Mark Asta ◽  
Robert O. Ritchie
Keyword(s):  
First Principles ◽  
Short Range ◽  
Short Range Order ◽  
Nearest Neighbor ◽  
Range Order ◽  
Magnetic Interactions ◽  
First Principles Calculations ◽  
Principal Element ◽  
The Impact ◽  
Magnetically Aligned

The presence, nature, and impact of chemical short-range order in the multi-principal element alloy CrCoNi are all topics of current interest and debate. First-principles calculations reveal that its origins are fundamentally magnetic, involving repulsion between like-spin Co–Cr and Cr–Cr pairs that is complemented by the formation of a magnetically aligned sublattice of second-nearest-neighbor Cr atoms. Ordering models following these principles are found to predict otherwise anomalous experimental measurements concerning both magnetization and atomic volumes across a range of compositions. In addition to demonstrating the impact of magnetic interactions and resulting chemical rearrangement, the possible explanation of experiments would imply that short-range order of this type is far more prevalent than previously realized.

scholarly journals Short-range order in metals above the Curie temperature

AIP Advances ◽  
2018 ◽  
Vol 8 (10) ◽  
pp. 101402 ◽  
Author(s):  
N. B. Melnikov ◽  
B. I. Reser ◽  
G. V. Paradezhenko
Keyword(s):  
Curie Temperature ◽  
Short Range ◽  
Short Range Order ◽  
Range Order

Magnetic short-range order in Fe and Ni above the Curie temperature

2019 ◽  
Vol 473 ◽  
pp. 296-300 ◽  
Author(s):  
N.B. Melnikov ◽  
G.V. Paradezhenko ◽  
B.I. Reser
Keyword(s):  
Curie Temperature ◽  
Short Range ◽  
Short Range Order ◽  
Range Order
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