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We propose a way of detecting dark matter axion by using two slabs ofconductor. The flat surfaces are put to meet face to face so that they areparallel to each other. External magnetic field $B$ parallel to the surfaces isimpressed. Radiations converted from the axion arise between two slabs. When wetune the spacing $l$ between two surfaces such as $l=\pi/m_a$ with axion mass$m_a$, a resonance occurs so that the radiations become strong. Furthermore,electric current flowing on the surface of the slabs is enhanced. We show thatthe electric current is large enough to be detectable at the resonance. Itreaches $0.7\times10^{-9}$A$(10^{-5}\mbox{eV}/m_a)^{1/2}(B/5\mbox{T})(L/10\mbox{cm})(\sigma/3.3\times10^7\rm eV)$, using $6$N copper of the square slab with side length $L$ andhigh electrical conductivity $\sigma$ at temperature $T\sim 1$K. The power ofthe Joule heating is$0.3\times10^{-22}\mbox{W}(B/5\mbox{T})^2(10^{-5}\mbox{eV}/m_a)^{1/2}(L/10\mbox{cm})^2(\sigma/3.3\times10^7\rm eV)$. When we amplify the power using LC circuit with $Q$ value, thesignal to noise ratio is $4.5\times10^4(Q/10^6)(B/5\mbox{T})^2(t_{obs}/1\sec)^{1/2}\,(10^{-5}\mbox{eV}/m_a)(L/10\mbox{cm})^2(\sigma/3.3\times 10^7\rm eV)$ with $t_{obs}$ observationaltime.

Detectable Electric Current induced by Dark Matter Axion in a Conductor