Reviews of topical problems

Francisites as new geometrically frustrated quasi-two-dimensional magnets

 a,  a,  a,  a,  a,  a, b, c
a Lomonosov Moscow State University, Vorobevy Gory, Moscow, 119991, Russian Federation
b National University of Science and Technology ‘MISIS’, Leninskii prosp. 4, Moscow, 119049, Russian Federation
c South Ural State University, Lenin prospekt 76, Chelyabinsk, 454080, Russian Federation

The synthesis of new geometrically frustrated layered systems has fueled experimental work and progress in building models of low-dimensional magnetism. Compounds with the structure of the francisite mineral, Cu3Bi(SeO3)2O2Cl, are quasi-two-dimensional antiferromagnets with a kagome-type lattice. With the dominant ferromagnetic interaction in the layer and a weak interlayer antiferromagnetic bond, the main non-collinear state of francisite is easily destroyed by an external magnetic field, which opens the possibility of reversible switching between states with the minimum and maximum possible magnetization. In the region of metamagnetic transition, multiferroelectric effects and broadband absorption of electromagnetic waves are observed. The implantation of rare-earth ions R into the Bi position is accompanied by spin-reorientation phase transitions in Cu3R(SeO3)2O2X compounds, where X=Cl, Br.

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Keywords: francisite, low-dimensional and frustrated magnetism, metamagnetism, multiferroics
PACS: 61.50.−f, 75.10.Jm, 75.25.-j (all)
DOI: 10.3367/UFNe.2020.05.038773
Citation: Markina M M, Berdonosov P S, Dolgikh V A, Zakharov K V, Kuznetsova E S, Vasil’ev A N "Francisites as new geometrically frustrated quasi-two-dimensional magnets" Phys. Usp. 64 344–356 (2021)
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Received: 17th, March 2020, revised: 4th, May 2020, 22nd, May 2020

Оригинал: Маркина М М, Бердоносов П С, Долгих В А, Захаров К В, Кузнецова Е С, Васильев А Н «Франциситы как новые геометрически фрустрированные квазидвумерные магнетики» УФН 191 358–371 (2021); DOI: 10.3367/UFNr.2020.05.038773

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