Single crystal growth and structural, magnetic, and magnetoelectric properties in spin-frustrated bow-tie lattice of α-Cu 5 O 2 (SeO 3 ) 2 Cl 2

Single crystals of α-Cu 5 O 2 (SeO 3 ) 2 Cl 2 are successfully prepared by the chemical vapor transport method, and their structural, magnetic, thermal, and dielectric properties are investigated as a function of temperature and magnetic field. Magnetization and specific heat measurements indicate a long-range antiferromagnetic transition at T N = 32 K. The spin ordering with a propagation vector q = (1/2 0 0) below T N is determined from the neutron diffraction patterns. The dielectric data reveal an anomaly near T N . Magnetic field-dependent dielectric measurements below T N = 32 K suggest a notable magnetodielectric effect with the scaling of magnetodielectric ∝ M 2 . Additionally, two more dielectric and associated specific heat anomalies are noticed above T N , collaborating with the synchrotron x-ray diffraction studies. These studies provide evidence that the bow-tie lattice of α-Cu 5 O 2 (SeO 3 ) 2 Cl 2 is a new magnetoelectric material.