1. Institute for Quantum Matter and Department of Physics and Astronomy, Johns Hopkins University, Baltimore, MD 21218, USA.
2. NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, MD 20899, USA.
3. Faculty of Education, University of the Ryukyus, Nishihara, Okinawa 903-0213, Japan.
4. Department of Materials Science and Engineering, University of Maryland, College Park, MD 20742, USA.
5. Department of Materials Science and Engineering, Johns Hopkins University, Baltimore, MD 21218, USA.
6. Institute for Solid State Physics, University of Tokyo, Kashiwa, Chiba 277-8581, Japan.
7. Department of Physics, University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan.
8. Trans-scale Quantum Science Institute, University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan.