High-temperature magnetostructural transition in van der Waals-layered
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Here, the crystallographic and magnetic properties of the cleavable 4d3 transition metal compound α–MoCl3 are reported, with a focus on the behavior above room temperature. Crystals were grown by chemical vapor transport and characterized using temperature dependent x-ray diffraction, Raman spectroscopy, and magnetization measurements. A structural phase transition occurs near 585 K, at which the Mo-Mo dimers present at room temperature are broken. A nearly regular honeycomb net of Mo is observed above the transition, and an optical phonon associated with the dimerization instability is identified in the Raman data and in first-principles calculations. The crystals are diamagnetic at room temperature in the dimerized state, and the magnetic susceptibility increases sharply at the structural transition. Moderately strong paramagnetism in the high-temperature structure indicates the presence of local moments on Mo. This is consistent with results of spin-polarized density functional theory calculations using the low- and high-temperature structures. Above the magnetostructural phase transition the magnetic susceptibility continues to increase gradually up to the maximum measurement temperature of 780 K, with a temperature dependence that suggests two-dimensional antiferromagnetic correlations.
- Research Organization:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- Grant/Contract Number:
- AC05-00OR22725; AC02-05CH11231
- OSTI ID:
- 1407774
- Alternate ID(s):
- OSTI ID: 1407843
- Journal Information:
- Physical Review Materials, Vol. 1, Issue 6; ISSN 2475-9953
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
Neutron Instruments for Research in Coordination Chemistry: Neutron Instruments for Research in Coordination Chemistry
|
journal | January 2019 |
Chemical Vapor Transport Reactions for Synthesizing Layered Materials and Their 2D Counterparts
|
journal | September 2019 |
A suite-level review of the neutron powder diffraction instruments at Oak Ridge National Laboratory
|
journal | September 2018 |
Phonon anomalies near the magnetostructural transition in : Raman spectroscopy and density functional theory studies
|
journal | October 2019 |
Similar Records
Itinerant ferromagnetism in van der Waals crystals above room temperature
Chemical disorder and spin-liquid-like magnetism in the van der Waals layered transition metal halide