Incommensurate-commensurate magnetic phase transition in the double tungstate Li2Co(WO4)2

Magnetic susceptibility, specific heat, and neutron powder diffraction measurements have been performed on polycrystalline Li2Co(WO4)2 samples. Under zero magnetic field, two successive magnetic transitions at TN1 ~ 9.4 K and TN2 ~ 7.4 K are observed. The magnetic ordering temperatures gradually dec...

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Bibliographic Details
Published in:arXiv.org 2021-11
Main Authors: Chen, Xiyu, Ding, Ning, Liu, Meifeng, Zou, Tao, Garlea, V Ovidiu, Gong, Jingwen, Liu, Fei, Xie, Yunlong, Yang, Lun, Zheng, Shuhan, Wang, Xiuzhang, Dong, Shuai, Charlton, T, Liu, Jun-Ming
Format: Article
Language:English
Subjects:
Antiferromagnetism
Cobalt
First principles
Magnetic fields
Magnetic moments
Magnetic permeability
Magnetic transitions
Neutron diffraction
Neutrons
Phase transitions
Temperature dependence
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Summary:Magnetic susceptibility, specific heat, and neutron powder diffraction measurements have been performed on polycrystalline Li2Co(WO4)2 samples. Under zero magnetic field, two successive magnetic transitions at TN1 ~ 9.4 K and TN2 ~ 7.4 K are observed. The magnetic ordering temperatures gradually decrease as the magnetic field increases. Neutron diffraction reveals that Li2Co(WO4)2 enters an incommensurate magnetic state with a temperature dependent k between TN1 and TN2. The magnetic propagation vector locks-in to a commensurate value k = (1/2, 1/4, 1/4) below TN2. The antiferromagnetic structure is refined at 1.7 K with Co2+ magnetic moment 2.8(1) uB, consistent with our first-principles calculations.
ISSN:2331-8422
DOI:10.48550/arxiv.2111.04944