1. Division of Superconductivity and MagnetismFelix Bloch Institute for Solid State PhysicsUniversity of Leipzig Leipzig 04103 Germany
2. Institute of PhysicsMartin Luther University Halle-Wittenberg Halle 06120 Germany
3. Advanced Light SourceLawrence Berkeley National Laboratory Berkeley CA 94720 USA
4. Department of Material Science and EngineeringStanford University Stanford CA 94305 USA
5. Department of PhysicsUniversity of California Santa Cruz Santa Cruz CA 95064 USA
6. Ion Source Development and Application GroupLeibniz Institute of Surface Engineering (IOM) Leipzig 04318 Germany
7. Institute for Theoretical PhysicsJohannes Kepler University Linz Linz 4040 Austria
8. Department of Materials Science & EngineeringInstitute of Materials ScienceUniversity of Connecticut Storrs CT 06269 USA