Primary affiliation:

High Magnetic Field Laboratory Dresden,

Helmholtz-Zentrum Dresden-Rossendorf,

Bautzner Landstr. 400,

01328 Dresden,

Germany

email: t.helm "at"hzdr.de

phone: +49 (0)351 260 3314

Secondary affiliation:

Microstructured Quantum Matter,

Max-Planck-Institute for Chemical Physics of Solids,

Noethnitzer Str. 40,

DE-01187 Dresden,

Germany