Abstract
The Hall effect and the magnetoresistance of single crystals of ${\mathrm{EuAs}}_{3}$ have been measured in the temperature region of magnetic ordering. We observe an extreme anisotropic behavior. When the magnetic field is applied perpendicular to the buckled As layers of the ${\mathrm{EuAs}}_{3}$ crystal structure, a strong positive magnetoresistance is found, similar to the case of \ensuremath{\alpha}-As. The situation changes completely with the magnetic field parallel to [010], the direction of the ordered ${\mathrm{Eu}}^{2+}$ moments in the low-temperature AF1 phase of ${\mathrm{EuAs}}_{3}$. In this case, the magnetoresistance is much weaker and reflects the field-induced magnetic phase transitions, similar to the case of the rare-earth metals Dy and Ho. We discuss these features on the basis of superzone and spin-fluctuation scattering.
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