| http://www.w3.org/ns/prov#value | - When the phase change layer of the present invention is a layer which, when it is crystallized, mainly comprises crystals of Fm3m structure or R3m structure, and more preferably solely from such crystals, and still more preferably from a single phase of either one of such crystals, and to be more specific, when the phase change layer is the one having the composition represented by formula (I) as
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