Work

Commensurate to incommensurate magnetic phase transition in honeycomb-lattice pyrovanadate Mn 2 V 2 O 7

Year: 2019

Type: article

Abstract: We have synthesized a single-crystalline sample of ${\mathrm{Mn}}_{2}{\mathrm{V}}_{2}{\mathrm{O}}_{7}$ using the floating zone technique, and we investigated the ground state using magnetic susceptibility, heat capacity, and neutron diffraction. Our magnetic susceptibility and heat capacity reveal two successive magnetic transitions at ${T}_{N1}=17\phantom{\rule{4pt}{0ex}}\mathrm{K}$ and ${T}_{N2}=11.8\phantom{\rule{4pt}{0ex}}\mathrm{K}$ indicating two distinct magnetically ordered phases. The single-crystal neutron diffraction study shows that in the temperature ($T$) range $11.8\ensuremath{\le}T\ensuremath{\le}17\phantom{\rule{4pt}{0ex}}\mathrm{K}$ the magnetic structure is commensurate with propagation vector ${k}_{1}=(0,0.5,0)$, while upon lowering temperature below ${T}_{N2}=11.8\phantom{\rule{4pt}{0ex}}\mathrm{K}$ an incommensurate magnetic order emerges with ${k}_{2}=(0.38,0.48,0.5)$ and the magnetic structure can be represented by cycloidal modulation of the Mn spin in the $ac$ plane. We discuss the role of magnetic exchange interactions and spin-orbital coupling on the stability of the observed magnetic phase transitions.

Source: Physical Review Materials

DOI: 10.1103/physrevmaterials.3.113401

Authors: J. Sannigrahi, D. T. Adroja, R. Perry, M. J. Gutmann, V. Petricek, D. Khalyavin