Heat switch effect in an antiferromagnetic insulator Co${}_3$V${}_2$O${}_8$

Abstract

We report a heat switch effect in single crystals of an antiferromagnet Co${}_3$V${}_2$O${}_8$, that is, the thermal conductivity ($\kappa$) can be changed with magnetic field in an extremely large scale. Due to successive magnetic phase transitions at 12--6 K, the zero-field $\kappa (T)$ displays a deep minimum at 6.7 K and rather small magnitude at low temperatures. Both the temperature and field dependencies of $\kappa$ demonstrate that the phonons are strongly scattered at the regime of magnetic phase transitions. Magnetic field can suppress magnetic scattering effect and significantly recover the phonon thermal conductivity. In particular, a 14 T field along the $a$ axis increases the $\kappa$ at 7.5 K up to 100 times. For $H\parallel c$, the magnitude of $\kappa$ can be suppressed down to $\sim$ 8% at some field-induced transition and can be enhanced up to 20 times at 14 T. The present results demonstrate that it is possible to design a kind of heat switch in the family of magnetic materials.

arXiv comment5 pages, 4 figures, accepted for publication in Appl. Phys. Lett

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• Contrasting magnetothermal conductivity in sibling Co-based honeycomb-lattice antiferromagnets
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