Cleavable crystals, crystal structure, and magnetic properties of the NbFe 1+ x Te 3 layered van der Waals telluride.

Autor: Verchenko VY; Department of Chemistry, Lomonosov Moscow State University, 119991 Moscow, Russia. valeriy.verchenko@gmail.com., Stepanova AV; Department of Chemistry, Lomonosov Moscow State University, 119991 Moscow, Russia. valeriy.verchenko@gmail.com., Bogach AV; Department of Chemistry, Lomonosov Moscow State University, 119991 Moscow, Russia. valeriy.verchenko@gmail.com.; Prokhorov General Physics Institute of the Russian Academy of Sciences, 119991 Moscow, Russia., Kirsanova MA; Center for Energy Science and Technology, Skolkovo Institute of Science and Technology, 121205 Moscow, Russia., Shevelkov AV; Department of Chemistry, Lomonosov Moscow State University, 119991 Moscow, Russia. valeriy.verchenko@gmail.com.
Jazyk: angličtina
Zdroj: Dalton transactions (Cambridge, England : 2003) [Dalton Trans] 2023 May 02; Vol. 52 (17), pp. 5534-5544. Date of Electronic Publication: 2023 May 02.
DOI: 10.1039/d3dt00588g
Abstrakt: Transition metal-based two-dimensional nanomaterials with competing magnetic states are at the cutting edge of spintronic and low-power memory devices. In this paper, we present a Fe-rich NbFe 1+ x Te 3 layered telluride ( x ≈ 0.5), which shows an interplay of spin-glass and antiferromagnetic states below the Néel temperature of 179 K. The compound has a layered crystal structure, where the NbFeTe 3 layers are terminated by the Te atoms and van der Waals gaps. Bulk single crystals grown by chemical vapor transport reactions possess the (1̄01) cleavage plane suitable for the exfoliation of two-dimensional nanomaterials. Combination of high-resolution transmission electron microscopy and powder X-ray diffraction reveals the zigzag ladders of Fe atoms inside the structural layers, as well as complementary zigzag chains of the partially occupied Fe positions in the interstitial region. Fe atoms carry large effective magnetic moment of 4.85(3) μ B per atom in the paramagnetic state yielding intriguing magnetic properties of NbFe 1+ x Te 3 . They include frozen spin-glass state at low temperatures and spin-flop transition in high magnetic fields indicating promising flexibility of the magnetic system and its potential control by magnetic field or gate tuning in the spintronic devices and heterostructures.
Databáze: MEDLINE
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