Universität zu Köln

Son, Suhan, Coak, Matthew J., Lee, Nahyun, Kim, Jonghyeon, Kim, Tae Yun, Hamidov, Hayrullo ORCID: 0000-0003-3236-8048, Cho, Hwanbeom, Liu, Cheng, Jarvis, David M., Brown, Philip A. C., Kim, Jae Hoon, Park, Cheol-Hwan ORCID: 0000-0003-1584-6896, Khomskii, Daniel, I, Saxena, Siddharth S. and Park, Je-Geun (2019). Bulk properties of the van der Waals hard ferromagnet VI3. Phys. Rev. B, 99 (4). COLLEGE PK: AMER PHYSICAL SOC. ISSN 2469-9969

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Abstract

We present comprehensive measurements of the structural, magnetic, and electronic properties of layered van der Waals ferromagnet VI3 down to low temperatures. Despite belonging to a well-studied family of transitionmetal trihalides, this material has received very little attention. We outline, from high-resolution powder x-ray diffraction measurements, a corrected room-temperature crystal structure to that previously proposed and uncover a structural transition at 79 K, also seen in the heat capacity. Magnetization measurements confirm VI(3 )to be a hard ferromagnet (9.1 kOe coercive field at 2 K) with a high degree of anisotropy, and the pressure dependence of the magnetic properties provide evidence for the two-dimensional nature of the magnetic order. Optical and electrical transport measurements show this material to be an insulator with an optical band gap of 0.67 eV-the previous theoretical predictions of d-band metallicity then lead us to believe VI3 to be a correlated Mott insulator. Our latest band-structure calculations support this picture and show good agreement with the experimental data. We suggest VI3 to host great potential in the thriving field of low-dimensional magnetism and functional materials, together with opportunities to study and make use of low-dimensional Mott physics.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Son, Suhan UNSPECIFIED UNSPECIFIED UNSPECIFIED Coak, Matthew J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Lee, Nahyun UNSPECIFIED UNSPECIFIED UNSPECIFIED Kim, Jonghyeon UNSPECIFIED UNSPECIFIED UNSPECIFIED Kim, Tae Yun UNSPECIFIED UNSPECIFIED UNSPECIFIED Hamidov, Hayrullo UNSPECIFIED orcid.org/0000-0003-3236-8048 UNSPECIFIED Cho, Hwanbeom UNSPECIFIED UNSPECIFIED UNSPECIFIED Liu, Cheng UNSPECIFIED UNSPECIFIED UNSPECIFIED Jarvis, David M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Brown, Philip A. C. UNSPECIFIED UNSPECIFIED UNSPECIFIED Kim, Jae Hoon UNSPECIFIED UNSPECIFIED UNSPECIFIED Park, Cheol-Hwan UNSPECIFIED orcid.org/0000-0003-1584-6896 UNSPECIFIED Khomskii, Daniel, I UNSPECIFIED UNSPECIFIED UNSPECIFIED Saxena, Siddharth S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Park, Je-Geun UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-159481
DOI:	10.1103/PhysRevB.99.041402
Journal or Publication Title:	Phys. Rev. B
Volume:	99
Number:	4
Date:	2019
Publisher:	AMER PHYSICAL SOC
Place of Publication:	COLLEGE PK
ISSN:	2469-9969
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language INTRINSIC FERROMAGNETISM; CRYSTAL-STRUCTURE; VANADIUM IODIDES; MAGNETISM; TRANSITION Multiple languages Materials Science, Multidisciplinary; Physics, Applied; Physics, Condensed Matter Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/15948