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Resistivity anisotropy of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>A</mml:mi><mml:msub><mml:mrow><mml:mtext>Fe</mml:mtext></mml:mrow><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mrow><mml:mtext>As</mml:mtext></mml:mrow><mml:mn>2</mml:mn></mml:msub></mml:mrow></mml:math>(<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>A</mml:mi><mml:mo>=</mml:mo><mml:mtext>Ca</mml:mtext></mml:mrow></mml:math>, Sr, Ba): …
The anisotropy of electrical resistivity was measured in parent compounds of the iron-arsenic high-temperature superconductors $A{\text{Fe}}_{2}{\text{As}}_{2}$ with alkali earth elements $A=\text{Ca}$, Sr, and Ba. Measurements were performed using both the Montgomery technique and direct resistivity measurements on samples cut along principal crystallographic directions. The anisotropy ratio ${\ensuremath{\gamma}}_{\ensuremath{\rho}}={\ensuremath{\rho}}_{c}/{\ensuremath{\rho}}_{a}$ is well below …