Abstract
${\mathrm{ZnNMn}}_{3}$ has an unusual cubic-to-cubic structural phase transition near 160 K, which coincides with the onset of the antiferromagnetic (AFM) ordering. The phase transformation involves the formation of microcracks induced by the magnetic moment-dependent lattice expansion, which is also accompanied by an upturn in the resistivity curve $\ensuremath{\rho}$$(T)$ near the N\'eel temperature. With an increasing number of warming and cooling cycles, the $\ensuremath{\rho}$$(T)$ curve shifts to progressively higher resistivity values due to the formation of microcracks. The origin of this peculiar behavior is discussed in terms of a reduced mean-free path associated with electron scattering on cracks at constant carrier concentration. In addition, we show that the AFM alignment caused by the interatomic distance-dependent exchange inversion leads to lattice expansion.
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