1. Institute of Solid State Physics, RAS, Chernogolovka 142432, Russia
2. Max-Planck-Institut für Festkörperforschung, Heisenbergstrasse 1, D-70569 Stuttgart, Germany
3. Department of Applied Physics and Quantum-Phase Electronics Center (QPEC), University of Tokyo, Tokyo 113-8656, Japan
4. RIKEN Center for Emergent Matter Science (CEMS), Wako 351-0198, Japan
5. Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan
6. PRESTO, Japan Science and Technology Agency (JST), Tokyo 102-0075, Japan