Surface defect free growth of a spin dimer TlCuCl3 compound crystals and investigations on its optical and magnetic properties

• Published in: Journal of solid state chemistry Vol. 237; pp. 358 - 363
• Main Authors: Ryu, Gihun, Son, Kwanghyo
• Format: Journal Article
• Language: English
• Published: Elsevier Inc 01.05.2016
• Subjects: Crystal growth; Magnetic properties; Optical properties; Spin dimer compound; Crystal growth; Spin dimer compound; Optical properties; Magnetic properties
• ISSN: 0022-4596; 1095-726X
• DOI: 10.1016/j.jssc.2016.02.048

A defect-free high quality single crystal of spin dimer TlCuCl3 compound is firstly synthesized at the optimal growth temperature using the vertical Bridgman method. In this study, we clearly found that the cupric chloride is easily decomposed into the Cl− deficient composition at ≥470°C. The Cl−- related gas phase at the high temperature region also always gives rise to a pinhole-like surface defect at the surface of crystal. Therefore, we clearly verified an exotic anisotropic magnetic behavior (anisotropic ratio of Mb/M(201) at 2K, 7T=10) using the defect-free TlCuCl3 crystals in this three-dimensional spin dimer TlCuCl3 compound, relatively stronger magnetic ordering in the H//b than that of H//(201) direction at above the transition magnetic field. A single crystal of spin dimer TlCuCl3 compound with a defect free is successfully synthesized on the basis of TG/DTA result. We newly found that this cupric chloride compound is easily decomposed into the Cl− deficient composition at ≥470°C and Cl− related gas phases also give rise to the defects like a pinhole on the surface of TlCuCl3 crystal. Using the crystals with a surface defect free, we also clearly verified the crystal structure of spin dimer TlCuCl3 compound. [Display omitted]