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Title: High-temperature magnetostructural transition in van der Waals-layered α - MoCl 3

Journal Article · · Physical Review Materials
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  1. 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
Citation Metrics:
Cited by: 35 works
Citation information provided by
Web of Science

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Cited By (4)

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 Li 2 RuO 3 : Raman spectroscopy and density functional theory studies journal October 2019


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