Comment on “Half-metallicity in europium oxide conductively matched with silicon”Schmehl, Andreas; Vaithyanathan, Venu; Herrnberger, Alexander; Thiel, Stefan; Richter, Christoph; Heeg, Tassilo; Röckerath, Martin; Kourkoutis, Lena Fitting; Mühlbauer, Sebastian; Böni, Peter; Muller, David A.; Barash, Yuri; Schubert, Jürgen; Mannhart, Jochen; Schlom, Darrell G. · Physical Review B · 2009