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5 records
All sourcesNASA NTRSDOE OSTI
DOE OSTI2026

Contrasting structural reversibility and magnetic correlations in isostructural honeycomb magnets CrCl3 and 𝛼−RuCl3

We report a comparative neutron single crystal diffraction study of the structural and magnetic properties of layered halides CrCl3 and 𝛼−RuCl3. They host a honeycomb arrangement of transition metal ions with distinct electronic configurations and undergo a first-order structural transition between high-temperature 𝐶⁢2/𝑚 and low-temperature 𝑅⁢‾‾‾3. Both compounds show a step-like change in the 𝑐-lattice parameter across the structure transition. In contrast, the in-plane lattice response is quite different: 𝛼−RuCl3 exhibits an abrupt hysteretic change across the transition accompanied by progressive crystalline degradation upon thermal cycling, whereas CrCl3 shows a smooth in-plane lattice evolution and remains structurally robust. Magnetically, CrCl3 orders into an A-type antiferromagnetic structure at 𝑇𝑁=14 K and exhibits pronounced diffuse magnetic scattering extending up to about 40 K. 𝛼−RuCl3 shows no observable magnetic diffuse scattering above its zigzag antiferromagnetic ordering temperature 𝑇𝑁=7.6 K. These results suggest that the contrasting structural responses arise from an interplay between interlayer sliding energetics, stacking-strain coupling, and elastic accommodation of the stacking transition. The distinct chemical bonding and electronic configurations of the two compounds provide a microscopic basis for their different lattice responses to the structure transition and magnetic correlations.

Morgan, Zachary [ORNL] (ORCID:0000000243625911)↗
DOE OSTI2020

Materials Data on CrCl3 by Materials Project

CrCl3 is Aluminum trichloride structured and crystallizes in the monoclinic C2/m space group. The structure is two-dimensional and consists of one CrCl3 sheet oriented in the (0, 0, 1) direction. Cr3+ is bonded to six Cl1- atoms to form edge-sharing CrCl6 octahedra. All Cr–Cl bond lengths are 2.36 Å. There are two inequivalent Cl1- sites. In the first Cl1- site, Cl1- is bonded in an L-shaped geometry to two equivalent Cr3+ atoms. In the second Cl1- site, Cl1- is bonded in an L-shaped geometry to two equivalent Cr3+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on CrCl3 by Materials Project

CrCl3 is Aluminum trichloride-like structured and crystallizes in the trigonal P3_212 space group. The structure is two-dimensional and consists of three CrCl3 sheets oriented in the (0, 0, 1) direction. Cr3+ is bonded to six Cl1- atoms to form edge-sharing CrCl6 octahedra. All Cr–Cl bond lengths are 2.36 Å. There are three inequivalent Cl1- sites. In the first Cl1- site, Cl1- is bonded in an L-shaped geometry to two equivalent Cr3+ atoms. In the second Cl1- site, Cl1- is bonded in an L-shaped geometry to two equivalent Cr3+ atoms. In the third Cl1- site, Cl1- is bonded in an L-shaped geometry to two equivalent Cr3+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on CrCl3 by Materials Project

CrCl3 crystallizes in the monoclinic C2/m space group. The structure is two-dimensional and consists of two CrCl3 sheets oriented in the (0, 1, 0) direction. there are four inequivalent Cr3+ sites. In the first Cr3+ site, Cr3+ is bonded in a distorted rectangular see-saw-like geometry to four Cl1- atoms. There are two shorter (2.16 Å) and two longer (2.46 Å) Cr–Cl bond lengths. In the second Cr3+ site, Cr3+ is bonded to six Cl1- atoms to form a mixture of edge and corner-sharing CrCl6 octahedra. The corner-sharing octahedral tilt angles are 50°. There are a spread of Cr–Cl bond distances ranging from 2.21–2.41 Å. In the third Cr3+ site, Cr3+ is bonded to six Cl1- atoms to form corner-sharing CrCl6 octahedra. The corner-sharing octahedral tilt angles are 50°. There are four shorter (2.38 Å) and two longer (2.51 Å) Cr–Cl bond lengths. In the fourth Cr3+ site, Cr3+ is bonded in a square co-planar geometry to four Cl1- atoms. There are two shorter (2.35 Å) and two longer (2.44 Å) Cr–Cl bond lengths. There are six inequivalent Cl1- sites. In the first Cl1- site, Cl1- is bonded in a single-bond geometry to one Cr3+ atom. In the second Cl1- site, Cl1- is bonded in a single-bond geometry to one Cr3+ atom. In the third Cl1- site, Cl1- is bonded in a bent 120 degrees geometry to two Cr3+ atoms. In the fourth Cl1- site, Cl1- is bonded in a water-like geometry to two equivalent Cr3+ atoms. In the fifth Cl1- site, Cl1- is bonded in a linear geometry to two Cr3+ atoms. In the sixth Cl1- site, Cl1- is bonded in a distorted trigonal planar geometry to three Cr3+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2022

Gapless Dirac magnons in CrCl3

Abstract Bosonic Dirac materials are testbeds for dissipationless spin-based electronics. In the quasi two-dimensional honeycomb lattice of CrX 3 (X = Cl, Br, I), Dirac magnons have been predicted at the crossing of acoustical and optical spin waves, analogous to Dirac fermions in graphene. Here we show that, distinct from CrBr 3 and CrI 3 , gapless Dirac magnons are present in bulk CrCl 3 , with inelastic neutron scattering intensity at low temperatures approaching zero at the Dirac K point. Upon warming, magnon-magnon interactions induce strong renormalization and decreased lifetimes, with a ~25% softening of the upper magnon branch intensity from 5 to 50 K, though magnon features persist well above T N . Moreover, on cooling below ~50 K, an anomalous increase in the a -axis lattice constant and a hardening of a ~26 meV phonon feature are observed, indicating magnetoelastic and spin-phonon coupling arising from an increase in the in-plane spin correlations that begins tens of Kelvin above T N .

36 MATERIALS SCIENCE↗