1. Institute for Condensed Matter Physics, TU Braunschweig, Braunschweig D-38106,
Germany
2. B. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine Kharkiv 61103, Ukraine
3. Laboratory of Emerging Nanometrology LENA, Braunschweig D-38106, Germany
4. CCES, Inst. for Basic Science, Dept. Physics and Astronomy, Seoul Nat. Univ., Seoul 08826, Republic of Korea
5. Department of Materials Engineering, Graduate School of Engineering, Kyoto University, Kyoto 615-8510,
Japan
6. Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University, Kyoto 615-8510,
Japan