Unconventional magnetic phase separation in $\gamma$-CoV${}_2$O${}_6$

Abstract

We have explored the magnetism in the non-geometrically frustrated spin-chain system $\gamma$-CoV${}_2$O${}_6$ which possesses a complex magnetic exchange network. Our neutron diffraction patterns at low temperatures ($T$ $⩽$ $T_{\mathrm{N}}$ = 6.6 K) are best described by a model in which two magnetic phases coexist in a volume ratio 65(1) : 35(1), with each phase consisting of a single spin modulation. This model fits previous studies and our observations better than the model proposed by Lenertz $et$ $al$ in J. Phys. Chem. C 118, 13981 (2014), which consisted of one phase with two spin modulations. By decreasing the temperature from $T_{\mathrm{N}}$, the minority phase of our model undergoes an incommensurate-commensurate lock-in transition at $T^{\ast }$ = 5.6 K. Based on these results, we propose that phase separation is an alternative approach for degeneracy-lifting in frustrated magnets.

References in corpus (9)

• Definitive Evidence for Order-by-Quantum-Disorder in Er2Ti2O7
• The nature of the magnetic order in Ca3Co2O6
• Slow Magnetic Order-Order Transition in the Spin Chain Antiferromagnet Ca3Co2O6
• Formation of Magnetic Microphases in Ca${}_3$Co${}_2$O${}_6$
• Spin-stripe phase in a frustrated zigzag spin-1/2 chain
• Novel phases in a square-lattice frustrated ferromagnet : 1/3-magnetisation plateau, helicoidal spin-liquid and vortex crystal
• Observation of Devil's Staircase in the Novel Spin Valve System SrCo${}_6$O${}_{11}$
• Spin-orbit transitions in $\alpha$ and $\gamma$-CoV${}_2$O${}_6$
• Magnetic and magnetocaloric properties of quasi-one-dimensional Ising spin chain CoV${}_2$O${}_6$

Cited by in corpus (2)

• Magnetic Microphase Inhomogeneity as a Thermodynamic Precursor of Ground State Phase Separation in Weakly Coupled Spin-$\frac{3}{2}$ Chains
• Exploring Low-Dimensional Magnetism in Cobalt Vanadates, $A$CoV${}_2$O${}_7$~($A$~=~Ca, Sr) : Crystal Growth and Magnetic Properties of Effective Spin-1/2 Zigzag Chains