Role of direct exchange and Dzyaloshinskii-Moriya interactions in magnetic properties of graphene derivatives: C2F and C2H / Mazurenko V. V.,Rudenko A. N.,Nikolaev S. A.,Medvedeva D. S.,Lichtenstein A. I.,Katsnelson M. I. // PHYSICAL REVIEW B. - 2016. - V. 94, l. 21.

ISSN/EISSN:

2469-9950 / 2469-9969

Type:

Article

Abstract:

According to Lieb's theorem the ferromagnetic interaction in graphene-based materials with bipartite lattice is a result of disbalance between the number of sites available for p(z) electrons in different sublattices. Here we report on another mechanism of the ferromagnetism in functionalized graphene that is the direct exchange interaction between spin orbitals. By the example of the single-side semihydrogenated (C2H) and semifluorinated (C2F) graphene we show that such a coupling can partially or even fully compensate antiferromagnetic character of indirect exchange interactions reported earlier {[}Phys. Rev. B 88, 081405(R) (2013)]. As a result, C2H is found to be a two-dimensional material with the isotropic ferromagnetic interaction and negligibly small magnetic anisotropy, which prevents the formation of the long-range magnetic order at finite temperature in accordance with the Mermin-Wagner theorem. This gives a rare example of a system where direct exchange interactions play a crucial role in determining a magnetic structure. In turn, C2F is found to be at the threshold of the antiferromagnetic-ferromagnetic instability, which in combination with the Dzyaloshinskii-Moriya interaction can lead to a skyrmion state.

Author keywords:

LOCALIZED WANNIER FUNCTIONS; SPIN; FERROMAGNETISM; TEMPERATURE; SYSTEMS; ATOMS

DOI:

10.1103/PhysRevB.94.214411

Web of Science ID:

ISI:000390247100002

Соавторы в МНС:

Другие поля

Поле	Значение
Month	DEC 12
Publisher	AMER PHYSICAL SOC
Address	ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA
Language	English
Article-Number	214411
EISSN	2469-9969
Keywords-Plus	LOCALIZED WANNIER FUNCTIONS; SPIN; FERROMAGNETISM; TEMPERATURE; SYSTEMS; ATOMS
Research-Areas	Physics
Web-of-Science-Categories	Physics, Condensed Matter
ResearcherID-Numbers	Rudenko, Alexander/E-2737-2017 Mazurenko, Vladimir/P-9241-2017 Medvedeva, Daria/E-6470-2017 Katsnelson, Mikhail/D-4359-2012
Funding-Acknowledgement	Ministry of Education and Science of the Russian Federation {[}16.1751.2014/K]; grant of the President of Russian Federation {[}MD-6458.2016.2]; Deutsche Forschungsgemeinschaft (DFG) {[}1459]; European Union's Horizon 2020 research and innovation programme {[}696656]
Funding-Text	We acknowledge fruitful communications with Igor Solovyev. The hospitality of the Institute of Theoretical Physics of Hamburg University and Radboud University of Nijmegen is gratefully acknowledged. The work is supported by the Ministry of Education and Science of the Russian Federation, Project No. 16.1751.2014/K and the grant of the President of Russian Federation MD-6458.2016.2. A.I.L. acknowledges the support of Deutsche Forschungsgemeinschaft (DFG) Priority Programme 1459. A.N.R. and M.I.K. acknowledge support from the European Union's Horizon 2020 research and innovation programme under Grant Agreement No. 696656, GrapheneCore1.
Number-of-Cited-References	54
Usage-Count-Last-180-days	3
Usage-Count-Since-2013	17
Journal-ISO	Phys. Rev. B
Doc-Delivery-Number	EF3TK