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Well, superconductors hit the theoretical maximum of µ = 0 or xm = -1, compared to bismuth's xm = -1.16×10-4.
I don't know any obvious reason why you couldn't design a room temperature material (or metamaterial) with a susceptibility of -0.1 or -0.5, i.e., a large but non-superconducting value.
However, I'm not a condensed matter physicist, so there may be good theoretical or pragmatic reasons why not.
Posted:Jan 8, 2009
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