Resistivity anisotropy of detwinned EuFe₂As₂. (a)–(c) Temperature dependence of in-plane resistivity (ρ_a, ρ_b) with no field, the field parallel to b, and the field parallel to c direction, respectively. The resistivity is measured by using Montgomery method. The uniaxial strain cell is shown in the inset of {(a)}. (d) The temperature dependent resistivity anisotropy.