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We show here that elementary crystalfield analysis of the 5D0 to 7F1 transition can critically distinguish such sites. Hence, we find that the center involved in the hysteretic photochromic switching observed in GaN(Mg):Eu, proposed as the basis of a solid state qubit material, is not in fact Eu1, as previously reported, but a related defect, Eu1(Mg). Furthermore, the decomposition of the crystalfield distortions of Eu0, Eu1(Mg), and Eu1 into axial and non-axial components strongly suggests reasonable microscopic models for the defects themselves.<\/jats:p>","DOI":"10.1063\/1.4939631","type":"journal-article","created":{"date-parts":[[2016,1,11]],"date-time":"2016-01-11T18:00:25Z","timestamp":1452535225000},"update-policy":"https:\/\/doi.org\/10.1063\/aip-crossmark-policy-page","source":"Crossref","is-referenced-by-count":33,"title":["Crystalfield symmetries of luminescent Eu3+ centers in GaN: The importance of the 5D to 7F1 transition"],"prefix":"10.1063","volume":"108","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-3072-3675","authenticated-orcid":false,"given":"K. P.","family":"O'Donnell","sequence":"first","affiliation":[{"name":"University of Strathclyde 1 SUPA Department of Physics, , 107 Rottenrow, Glasgow G4 0NG, Scotland, United Kingdom"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7671-7698","authenticated-orcid":false,"given":"P. R.","family":"Edwards","sequence":"additional","affiliation":[{"name":"University of Strathclyde 1 SUPA Department of Physics, , 107 Rottenrow, Glasgow G4 0NG, Scotland, United Kingdom"}]},{"given":"M.","family":"Yamaga","sequence":"additional","affiliation":[{"name":"Gifu University 2 Department of Mathematical and Design Engineering, , Gifu 501-1193, Japan"}]},{"given":"K.","family":"Lorenz","sequence":"additional","affiliation":[{"name":"Universidade de Lisboa 3 IPFN, Instituto Superior T\u00e9cnico, , Campus Tecnol\u00f3gico e Nuclear, Estrada Nacional 10, 2695-066 Bobadela LRS, Portugal"}]},{"given":"M. J.","family":"Kappers","sequence":"additional","affiliation":[{"name":"University of Cambridge 4 Department of Materials Science and Metallurgy, , 27 Charles Babbage Road, Cambridge CB3 0FS, England, United Kingdom"}]},{"given":"M.","family":"Bo\u0107kowski","sequence":"additional","affiliation":[{"name":"Institute of High Pressure Physics PAS 5 , Sokolowska 29\/37, 01-142 Warsaw, Poland"}]}],"member":"317","published-online":{"date-parts":[[2016,1,11]]},"reference":[{"key":"2023071503445661900_c1a","doi-asserted-by":"publisher","first-page":"718","DOI":"10.1049\/el:19890486","volume":"25","year":"1989","journal-title":"Electron. Lett."},{"key":"2023071503445661900_c1b","doi-asserted-by":"publisher","first-page":"466","DOI":"10.1002\/pssc.201400133","volume":"12","year":"2015","journal-title":"Phys. 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