J ul 2 01 9 Coexisting spin resonance and long-range magnetic order of Eu in EuRbFe 4 As

K. Iida, ∗ Y. Nagai, 3 S. Ishida, M. Ishikado, N. Murai, A. D. Christianson, 7 H. Yoshida, Y. Inamura, H. Nakamura, A. Nakao, K. Munakata, D. Kagerbauer, M. Eisterer, K. Kawashima, Y. Yoshida, H. Eisaki, and A. Iyo Neutron Science and Technology Center, Comprehensive Research Organization for Science and Society (CROSS), Tokai, Ibaraki 319-1106, Japan CCSE, Japan Atomic Energy Agency (JAEA), Kashiwa, Chiba 277-0871, Japan Mathematical Science Team, RIKEN Center for Advanced Intelligence Project (AIP), 1-4-1 Nihonbashi, Chuo-ku, Tokyo 103-0027, Japan National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki 305-8568, Japan Materials and Life Science Division, J-PARC Center, Tokai, Ibaraki 319-1195, Japan Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA Department of Physics, Faculty of Science, Hokkaido University, Sapporo, Hokkaido 060-0810, Japan Atominstitut, TU Wien, Stadionalle 2, 1020 Vienna, Austria IMRA Material R&D Co., Ltd., Kariya, Aichi 448-0032, Japan (Dated: July 10, 2019)