In a laboratory, a two-dimensional complex (dusty) plasma consists of a
low-density ionized gas containing a confined suspension of Yukawa-coupled
plastic microspheres. For an initial crystal-like form, we report ideal gas
behavior in this strongly-coupled system during shock-wave experiments. This
evidence supports the use of the ideal gas law as the equation of state for
soft crystals such as those formed by dusty plasmas.Comment: 5 pages, 5 figures, 5 authors, published versio
