Abstract
chinese acad sci, inst met res, int ctr mat phys, shenyang 110015, peoples r china. mit, dept elect engn & comp sci, cambridge, ma 02139 usa. mit, dept phys, cambridge, ma 02139 usa.;cheng, hm (reprint author), chinese acad sci, inst met res, int ctr mat phys, 72 wenhua rd, shenyang 110015, peoples r china
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