Crystal growth, structure, magnetic properties and theoretical exchange interaction calculations of Cu2MnBO5

• Single crystals of ludwigite Cu2MnBO5 were synthesized.
• Structural characterization was carried out by the X-ray diffraction and EXAFS technique.
• Cations composition was determined by X-ray diffraction and EXAFS technique.
• Cu2MnBO5 magnetic behavior was analyzed in frameworks of indirect coupling model

Single crystals of ludwigite Cu2MnBO5 were synthesized by flux growth technique. The detailed structural and magnetic characterizations of the synthesized samples have been carried out. The cations composition of the studied crystal was determined using X-ray diffraction and EXAFS technique, the resulting composition differ from the content of the initial Mn2O3–CuO components of the flux. Magnetic susceptibility measurements and the calculations of the exchange integrals in frameworks of indirect coupling model revealed that monoclinic distortions strongly affect exchange interactions and appearance of magnetic ordering phase at the temperature T=93 K. The hypothesis of the existence of several magnetic subsystems was supposed.