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Multiferroicity and thermal expansion of the layered metal-organic framework [NH4Cl]2[Ni(HCOO)2(NH3)2] |
| Dan Cheng(程丹), Yingjie He(何英杰), Shuang Liu(刘爽), Na Su(苏娜), and Young Sun(孙阳)† |
| Department of Applied Physics and Center of Quantum Materials and Devices, Chongqing University, Chongqing 401331, China |
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Abstract We have investigated the magnetic, dielectric, pyroelectric, and thermal expansion properties of a layered perovskite metal-organic framework, [NH$_{4}$Cl]$_{2}$[Ni(HCOO)$_{2}$(NH$_{3}$)$_{2}$]. The material undergoes three phase transitions including a canted antiferromagnetic transition at $\sim 36 $ K, and two successive structural transitions around 100 K and 110 K, respectively. The temperature dependence of dielectric permittivity and pyroelectric current suggests that the structural transitions induce weak ferroelectricity along the $c$-axis and antiferroelectricity in the ab plane. A negative thermal expansion along the $c$-axis is observed between two structural phase transitions, which is ascribed to the abnormal shrinkage of interlayer hydrogen bonding length. Moreover, the ferroelectric/antiferroelectric phase transition temperature shifts towards a higher temperature under a magnetic field, suggesting certain magnetoelectric coupling in the paramagnetic phase. Our study suggests that the layered metal-organic frameworks provide a unique playground for exploring exotic physical properties such as multiferroicity and abnormal thermal expansion.
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Received: 20 March 2025
Revised: 01 April 2025
Accepted manuscript online: 09 April 2025
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PACS:
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75.85.+t
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(Magnetoelectric effects, multiferroics)
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77.84.-s
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(Dielectric, piezoelectric, ferroelectric, and antiferroelectric materials)
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81.07.Pr
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(Organic-inorganic hybrid nanostructures)
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75.50.Ee
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(Antiferromagnetics)
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| Fund: Project supported by the National Key Research and Development Program of China (Grant No. 2021YFA1400303) and the National Natural Science Foundation of China (Grant No. 12227806). |
Corresponding Authors:
Young Sun
E-mail: youngsun@cqu.edu.cn
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Cite this article:
Dan Cheng(程丹), Yingjie He(何英杰), Shuang Liu(刘爽), Na Su(苏娜), and Young Sun(孙阳) Multiferroicity and thermal expansion of the layered metal-organic framework [NH4Cl]2[Ni(HCOO)2(NH3)2] 2025 Chin. Phys. B 34 067505
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