First-principles modeling of longitudinal spin fluctuations in itinerant electron antiferromagnets: High Néel temperature in theV3Alalloy

2016 ◽  
Vol 94 (2) ◽  
Author(s):  
Sergii Khmelevskyi
Keyword(s):  
First Principles ◽  
Spin Fluctuations ◽  
Itinerant Electron ◽  
Neel Temperature ◽  
Néel Temperature ◽  
Longitudinal Spin

Longitudinal spin fluctuations in itinerant electron ferromagnets

1995 ◽  
Vol 7 (9) ◽  
pp. 1855-1862 ◽  
Author(s):  
A Z Solontsov ◽  
A N Vasil'ev ◽  
D Wagner
Keyword(s):  
Spin Fluctuations ◽  
Itinerant Electron ◽  
Longitudinal Spin

scholarly journals Природа открытия и модификации дираковской щели в аксионном антиферромагнитном топологическом изоляторе MnBi-=SUB=-2-=/SUB=-Te-=SUB=-4-=/SUB=-

2020 ◽  
Vol 62 (8) ◽  
pp. 1293
Author(s):  
А.М. Шикин
Keyword(s):  
Laser Radiation ◽  
Photoelectron Spectroscopy ◽  
Dirac Point ◽  
Theoretical Calculations ◽  
Spin Fluctuations ◽  
Neel Temperature ◽  
Many Body ◽  
Néel Temperature ◽  
The Difference ◽  
Gap Width

Abstract The angle-resolved photoelectron spectroscopy with photoexcitation by laser radiation ( h ν = 6.3 eV) is used to study the modification of the gap open at the Dirac point in an axion antiferromagnetic topological insulator MnBi_2Te_4 at temperatures higher and lower the Néel temperature (24.5 K). The open gap is shown can have both anomalously high (62–67 meV) and significantly decreased (15–18 meV) values in various MnBi_2Te_4 samples or various areas of the same sample. In both the cases, the gap remains open above the Néel temperature. As a result of the studies, it is assumed that the difference in the widths of the gaps open at the Dirac point is related to the manifestation of the effect of fractionation of axion term θ. The gap width (62–67 meV) that correlates with the result of theoretical calculations corresponds to the state with axion term θ = π. In this case, the experimental observation of the gap at the Dirac point of 15–18 meV corresponds to the effective modulation of the axion term θ = π/4 due to the generation of many-body chiral spin fluctuations and their interaction upon laser photoexcitation.

Strain effect on the Néel temperature of SrTcO3 from first-principles calculations

2015 ◽  
Vol 219 ◽  
pp. 25-27 ◽  
Author(s):  
Chun-Lan Ma ◽  
Cheng-Min Dai ◽  
Gao-Yuan Chen ◽  
Da Chen ◽  
Tao-Cheng Zang ◽  
...  
Keyword(s):  
First Principles ◽  
Strain Effect ◽  
Neel Temperature ◽  
First Principles Calculations ◽  
Néel Temperature

scholarly journals Effect of spin fluctuations on superconductivity in V and Nb: A first-principles study

2020 ◽  
Vol 102 (21) ◽  
Author(s):  
Kentaro Tsutsumi ◽  
Yuma Hizume ◽  
Mitsuaki Kawamura ◽  
Ryosuke Akashi ◽  
Shinji Tsuneyuki
Keyword(s):  
First Principles ◽  
Spin Fluctuations ◽  
First Principles Study
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