Eightfold degenerate Dirac nodal line in the collinear antiferromagnet Mn5Si3

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378271%3A_____%2F25%3A00618592" target="_blank" >RIV/68378271:_____/25:00618592 - isvavai.cz</a>

Výsledek na webu

<a href="https://doi.org/10.1103/PhysRevB.111.085147" target="_blank" >https://doi.org/10.1103/PhysRevB.111.085147</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1103/PhysRevB.111.085147" target="_blank" >10.1103/PhysRevB.111.085147</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Eightfold degenerate Dirac nodal line in the collinear antiferromagnet Mn5Si3

Popis výsledku v původním jazyce

We study the electronic, magnetic, and spin-transport properties of the orthorhombic Mn5Si3 compound in the AF2 phase using symmetry analysis and ab initio calculations. Our ground-state energy calculations align with experimental observations, demonstrating that the collinear antiferromagnetic (AFM) order, with the Néel vector in the [010] direction, is the most stable magnetic configuration both with and without spin-orbit coupling (SOC) in bulk lattice geometry. We identified an unconventional eightfold degenerate Dirac nodal line (DNL) close to the Fermi level, characterized by negligible SOC. This DNL is robustly protected by a unique combination of pure-spin and lattice symmetries together with magnetic space-group (MSG) symmetries. Upon introducing SOC, this degeneracy is reduced to two fourfold DNLs, being protected by the combination of time-reversal, partial translation, and nonsymmorphic symmetries within the MSG. We also predict a large intrinsic spin Hall conductivity which correlates with the presence of SOC-induced splitting of these eightfold degenerate DNLs near the Fermi level. These intriguing characteristics position the collinear AFM Mn5Si3 as a compelling candidate for spintronic applications, particularly in the generation and detection of spin currents, while remaining compatible with modern silicon technology.n

Název v anglickém jazyce

Eightfold degenerate Dirac nodal line in the collinear antiferromagnet Mn5Si3

Popis výsledku anglicky

We study the electronic, magnetic, and spin-transport properties of the orthorhombic Mn5Si3 compound in the AF2 phase using symmetry analysis and ab initio calculations. Our ground-state energy calculations align with experimental observations, demonstrating that the collinear antiferromagnetic (AFM) order, with the Néel vector in the [010] direction, is the most stable magnetic configuration both with and without spin-orbit coupling (SOC) in bulk lattice geometry. We identified an unconventional eightfold degenerate Dirac nodal line (DNL) close to the Fermi level, characterized by negligible SOC. This DNL is robustly protected by a unique combination of pure-spin and lattice symmetries together with magnetic space-group (MSG) symmetries. Upon introducing SOC, this degeneracy is reduced to two fourfold DNLs, being protected by the combination of time-reversal, partial translation, and nonsymmorphic symmetries within the MSG. We also predict a large intrinsic spin Hall conductivity which correlates with the presence of SOC-induced splitting of these eightfold degenerate DNLs near the Fermi level. These intriguing characteristics position the collinear AFM Mn5Si3 as a compelling candidate for spintronic applications, particularly in the generation and detection of spin currents, while remaining compatible with modern silicon technology.n

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10302 - Condensed matter physics (including formerly solid state physics, supercond.)

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2025

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Physical Review B

ISSN

2469-9950

e-ISSN

2469-9969

Svazek periodika

111

Číslo periodika v rámci svazku

8

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

12

Strana od-do

085147

Kód UT WoS článku

001448475300002

EID výsledku v databázi Scopus

2-s2.0-85218634738