Metastable, close-packed films of elemental, divalent Eu from about a half to several monolayers thick on several substrates were found to be nonmetallic. Photoemission showed no states within 1.4 eV of the Fermi level. Low energy electron diffraction studies of Eu films on Ta(110) showed a closepacked pattern with orientational epitaxy. With increased thickness this phase reverted to metallic bcc Eu with orientational epitaxy.
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Olson et al. (1995) studied this question.
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