Quadrupole and hexadecapole ordering in DyB₂C₂: Direct observation with resonant x-ray diffraction

Yoshikazu Tanaka, Toshiya Inami, Stephen W. Lovesey, Kevin S. Knight, Flora Yakhou, Danny Mannix, Masayuki Kanazawa, Kohtaro Ishida, Susumu Nanao, Tetsuya Nakamura, Hiroki Yamauchi, Hideya Onodera, Kenji Ohoyama, Yamaguchi Nakamura