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

Abstract

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.