Torque magnetometry study of magnetically ordered state and spin reorientation in the quasi-one-dimensional $S=1/2$ Heisenberg antiferromagnet CuSb${}_2$O${}_6$

Abstract

We present an experimental study of macroscopic and microscopic magnetic anisotropy of a spin tetramer system \cso using torque magnetometry and ESR spectroscopy. Large rotation of macroscopic magnetic axes with temperature observed from torque magnetometry agrees reasonably well with the rotation of the $\mathbf{g}$ tensor above $T\gtrsim 50$~K. Below 50~K, the $\mathbf{g}$ tensor is temperature independent, while macroscopic magnetic axes continue to rotate. Additionally, the susceptibility anisotropy has a temperature dependence which cannot be reconciled with the isotropic Heisenberg model of interactions between spins. ESR linewidth analysis shows that anisotropic exchange interaction must be present in \csos. These findings strongly support the presence of anisotropic exchange interactions in the Hamiltonian of the studied system. Below $T_N=8$~K, the system enters a long - range antiferromagnetically ordered state with easy axis along the $<\bar{1}01{>}^{\ast }$ direction. Small but significant rotation of magnetic axes is also observed in the antiferromagnetically ordered state suggesting strong spin-lattice coupling in this system.

10 pages, 10 figures

References in corpus (3)

• Most spin-1/2 transition-metal ions do have single ion anisotropy
• Quasi one-dimensional magnetism driven by unusual orbital ordering in CuSb2O6
• Transition from one-dimensional antiferromagnetism to three-dimensional antiferromagnetic order in single-crystalline CuSb${}_2$O${}_6$

Cited by in corpus (3)

• Lattice dynamics of ASb2O6 (A=Cu,Co) with trirutile structure
• Site-Specific Spin Reorientation in Antiferromagnetic State of Quantum System SeCuO${}_3$
• Coupling of phonons with orbital dynamics and magnetism in CuSb${}_2$O${}_6$