Single crystal growth and physical properties of pyroxene CoGeO$_3$
L. Zhao, Z. Hu, H. Guo, C. Geibel, H. J. Lin, C. T. Chen, D. I., Khomskii, L. H. Tjeng, A. C. Komarek
TL;DR
This study reports the synthesis of large CoGeO$_3$ single crystals and investigates their anisotropic magnetic properties, revealing strong single ion anisotropy and significant orbital moments in the material.
Contribution
The paper presents the first growth of cm-sized CoGeO$_3$ single crystals under high pressure and characterizes their anisotropic magnetic behavior.
Findings
Highly anisotropic magnetic susceptibility observed
Effective magnetic moments exceed spin-only values
Strong single ion anisotropy with T$_N$~$ ext{~}$33.5 K
Abstract
We report on the synthesis and physical properties of cm-sized CoGeO single crystals grown in a high pressure mirror furnace at pressures of 80~bar. Direction dependent magnetic susceptibility measurements on our single crystals reveal highly anisotropic magnetic properties that we attribute to the impact of strong single ion anisotropy appearing in this system with T~~33.5~K. Furthermore, we observe effective magnetic moments that are exceeding the spin only values of the Co ions which reveals the presence of sizable orbital moments in CoGeO.
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