000040600 001__ 40600 000040600 005__ 20230426083051.0 000040600 017__ $$aThis version is available at the following Publisher URL: http://prb.aps.org 000040600 0247_ $$2DOI$$a10.1103/PhysRevB.70.155313 000040600 0247_ $$2WOS$$aWOS:000224855900055 000040600 0247_ $$2Handle$$a2128/1379 000040600 037__ $$aPreJuSER-40600 000040600 041__ $$aeng 000040600 082__ $$a530 000040600 084__ $$2WoS$$aPhysics, Condensed Matter 000040600 1001_ $$0P:(DE-Juel1)VDB21442$$aHöhler, H.$$b0$$uFZJ 000040600 245__ $$aCd-vacancy and Cd-interstitial complexes in Si and Ge 000040600 260__ $$aCollege Park, Md.$$bAPS$$c2004 000040600 300__ $$a155313 000040600 3367_ $$0PUB:(DE-HGF)16$$2PUB:(DE-HGF)$$aJournal Article 000040600 3367_ $$2DataCite$$aOutput Types/Journal article 000040600 3367_ $$00$$2EndNote$$aJournal Article 000040600 3367_ $$2BibTeX$$aARTICLE 000040600 3367_ $$2ORCID$$aJOURNAL_ARTICLE 000040600 3367_ $$2DRIVER$$aarticle 000040600 440_0 $$04919$$aPhysical Review B$$v70$$x1098-0121 000040600 500__ $$aRecord converted from VDB: 12.11.2012 000040600 520__ $$aThe electrical-field gradient (EFG), measured, e.g., in perturbed angular correlation experiments, gives particularly useful information about the interaction of probe atoms like In-111/Cd-111 with other defects. The interpretation of the EFG is, however, a difficult task. This paper aims at understanding the interaction of Cd impurities with vacancies and interstitials in Si and Ge, which represents a controversial issue. We apply two complementary ab initio methods in the framework of density-functional theory, (i) the all electron Korringa-Kohn-Rostoker Green function method and (ii) the pseudopotential-plane-wave method, to search for the correct local geometry. Surprisingly we find that both in Si and Ge the substitutional Cd-vacancy complex is unstable and relaxes to a split-vacancy complex with the Cd on the bond-center site. This complex has a very small EFG, allowing a unique assignment of the small measured EFGs of 54 MHz in Ge and 28 MHz in Si. Also, for the Cd-self-interstitial complex we obtain a highly symmetrical split configuration with large EFG's, being in reasonable agreement with experiments. 000040600 536__ $$0G:(DE-Juel1)FUEK242$$2G:(DE-HGF)$$aKondensierte Materie$$cM02$$x0 000040600 542__ $$2Crossref$$i2004-10-18$$uhttp://link.aps.org/licenses/aps-default-license 000040600 588__ $$aDataset connected to Web of Science 000040600 650_7 $$2WoSType$$aJ 000040600 7001_ $$0P:(DE-Juel1)130513$$aAtodiresei, N.$$b1$$uFZJ 000040600 7001_ $$0P:(DE-Juel1)VDB3933$$aSchroeder, K.$$b2$$uFZJ 000040600 7001_ $$0P:(DE-Juel1)131057$$aZeller, R.$$b3$$uFZJ 000040600 7001_ $$0P:(DE-Juel1)130612$$aDederichs, P. 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