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

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arxiv 2111.04944 v1 pith:43XMSELU submitted 2021-11-09 cond-mat.mtrl-sci cond-mat.str-el

Xiyu Chen , Ning Ding , Meifeng Liu , Tao Zou , V. Ovidiu Garlea , Jingwen Gong , Fei Liu , Yunlong Xie
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Lun Yang Shuhan Zheng Xiuzhang Wang Shuai Dong T. Charlton Jun-Ming Liu
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classification cond-mat.mtrl-scicond-mat.str-el
keywords magneticli2codiffractionfieldneutronantiferromagneticbeenbelow
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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.

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