Magnetic Properties and Magnetodielectric Effect in (C 6 H 5 CH 2 NH 3 ) 2 [CuCl 4 ] with Organic-Inorganic Hybrid Layer
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Magnetic Properties and Magnetodielectric Effect in (C6 H5 CH2 NH3 )2 [CuCl4 ] with Organic-Inorganic Hybrid Layered Structure Y. H. Kim and N. Hur∗ Department of Physics, Inha University, Incheon 402-751, Korea (Received 13 October 2020; revised 26 October 2020; accepted 26 October 2020) Metal Organic Frameworks (MOFs) are a group of multiferroic candidates that exhibit various optical, electrical, magnetic, and structural properties depending on the type of organic cations, transition metals and halogen elements, and their molar ratio. (C6 H5 CH2 NH3 )2 [CuCl4 ] (BZACC), one of the MOF materials, has a special hybrid layered structure of organic and inorganic layers. Magnetic property measurement showed that BZACC exhibits weak in-plane ferromagnetism below the Curie point (TC ) of 10.25 K and the saturated magnetic moment of 1 μB per formula unit at 2 K. When the magnetic field is less than 0.1 T along the c axis, it exhibits weak antiferromagnetism below 8 K. From the measurement of the dielectric constant with external magnetic field, we observed a maximum magnetodielectric (MD) effect of 0.4% at 2 K. Furthermore, it was found that the magnetic-field dependence of the MD effect is similar to that of the second derivative of magnetization with respect to magnetic field. We suggest that the observed MD effect is the consequence of the magnetic-field-induced spin structure change in the inorganic layer, which induces the change in the interlayer magnetic coupling and, as a result, induces the change in the dielectric constant by the applied magnetic field. Keywords: Metal organic framework, Organic inorganic hybrid layered perovskite, Magnetodielectric effect, Ferromagnetism DOI: 10.3938/jkps.77.1026
I. INTODUCTION Recently, attempts to combine several organic and inorganic materials have focused on the highly efficient photovoltaic effect of CH3 NH3 PbI3 with perovskite structure AMX3 [1–3]. Such optical properties vary depending on constituting organic cations, metals, and halogen elements, and the applicability according to various combinations is also increased [4–11]. However, as compared to the studies on the optical property such as photovoltaic effect, studies on the basic properties such as magnetic, electrical, and dielectric properties have been relatively less conducted. The organic-inorganic hybrid halide can have various physical properties such as ferroelectricity, ferromagnetic property, etc. depending on the types of organic cations and transition metals and halogen elements or some monovalent anions. These organic-inorganic hybrid materials are classified as MOFs. Due to the diversity of materials, MOFs have emerged as a strong candidate to have multiferroic properties and magnetoelectric effects. MOF materials with perovskite structures are classified into two families such as AMX3 and A2 MX4 depending on the molar ratio of organic and inorganic materials ∗ E-mail:
(A = organic anions, M = transition metals, X = halogen elements or COOH). In particular, A2 MX4 has a peculiar hybrid layered structure of organic l
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